Building Code Update

2024 Building Code Technical Bulletins

 

Technical Bulletin – Division B, Part 7

 

Part 7 Plumbing

Editorial changes

Throughout Part 7, some words are deleted or replaced, for example:
The defined term “size” has been replaced with “nominal pipe size” to align with industry
terminology.

 

Numbering system changes

Part 7 of Ontario’s Building Code is derived from the 2020 National Plumbing Code of
Canada (NPC). The 2020 NBC has Part 7 Plumbing Services which directs the users to
the 2020 NPC. Ontario’s Building Code adopts many requirements of the 2020 NPC
with some Ontario Amendments that are included in full in Part 7 of Ontario’s Building
Code. Throughout Part 7, some Article numbering has changed to reflect the same
numbering in the 2020 NPC with Ontario amendments.

Ontario only changes
Harmonization with the 2020 NBC and 2020 NPC is accompanied with the specific
changes pertaining to only Ontario’s Building Code. Those changes are assigned new

Articles / Sentence numbers.
Editorial changes also included:

 

Section 7.1. General

Scope (Article 7.0.1.1.)
This Article updates the Division A reference for the scope of Part 7.
Application (Article 7.1.1.1.)
Article 7.1.2.1. Application has been relocated to Article 7.1.1.1. Harmonized with 2020
NPC.

Definitions (Article 7.1.1A.1.)
Article 7.1.3.1. Definitions has been relocated to Article 7.1.1A.1. Ontario-only provision
retained.
Facilities Required (Article 7.1.1B.1.)
Article 7.1.4.1. Facilities Required has been relocated to Article 7.1.1B.1. Ontario-only
provision retained.
Floor Drains (Article 7.1.1B.2.)
Article 7.1.4.2. Floor Drains has been relocated to Article 7.1.1B.2. Ontario-only
provision retained.
Sanitary Drainage Systems (Article 7.1.2.1.)
Article 7.1.5.1. Sanitary Drainage Systems has been relocated to Article 7.1.2.1.
Harmonized with 2020 NPC.
Storm Drainage Systems (Article 7.1.2.2.)
Article 7.1.5.2. Storm Drainage Systems has been relocated to Article 7.1.2.2.
Harmonized with 2020 NPC.
Water Distribution Systems (Article 7.1.2.3.)
Article 7.1.5.3. Water Distribution Systems has been relocated to Article 7.1.2.3.
Harmonized with 2020 NPC except for Ontario-only Sentences 7.1.2.3.(2) and (3).
The exception in Sentence (1) has been updated for service connections to allow
wastewater and rainwater to be diverted to non-potable water systems for consistency
with non-potable water systems and non-potable rainwater harvesting systems. In
addition, this Sentence harmonizes with the 2020 NPC with respect to required
connections for water distribution systems.
Separate Services (Article 7.1.2.4.)
Article 7.1.5.4. Separate Services has been relocated to Article 7.1.2.4. Harmonized
with 2020 NPC except for Ontario-only Sentences 7.1.2.4.(2) and (3).
Sentences 7.1.5.4.(1) and (2) are now combined in Sentence 7.1.2.4.(1).

Private Sewers and Private Water Supply (Article 7.1.2.5.)
Article 7.1.5.5. Private Sewers and Private Water Supply has been relocated to Article
7.1.2.5. Harmonized with 2020 NPC.
Lighting and Ventilation Requirements (Article 7.1.3.1.)
Article 7.1.6.1. Lighting and Ventilation requirements has been relocated to Article
7.1.3.1. Harmonized with 2020 NPC.
Sentence (1) now additionally references Part 6.
Accessibility (Article 7.1.3.2.)
Article 7.1.6.2. Accessibility has been relocated to Article 7.1.3.2. Ontario-modified
provision retained.
Structural Movement (Article 7.1.3A.1.)
Article 7.1.7.1 Structural Movement has been relocated to Article 7.1.3A.1. Ontario-only
provision retained.
Seismic Restraints and Design (Article 7.1.4.1.)
This new Sentence introduces requirements related to seismic protection of plumbing
systems, which requires that the plumbing systems in buildings constructed in
accordance with Part 3 shall be designed and installed to accommodate the seismic
forces addressed in Subsection 4.1.8. Harmonized with 2020 NPC.

 

Section 7.2. Materials and Equipment

Identification (Article 7.2.1.3.)
Article 7.2.1.3. Identification and Certification title has been changed to Identification to
harmonize with 2020 NPC.
Sentence (1) has been restructured to match the 2020 NPC.
Working Pressure of a Water Service Pipe (Article 7.2.1.6.)
New Article 7.2.1.6. Working Pressure of a Water Service Pipe has been added to
regulate the working pressure of a water service pipe to be not less than the maximum
watermain pressure at the point of connection.

Surface Requirements (Article 7.2.2.1.)
Sentence (1) has been updated to remove the exception for areas designed to be slip
proof in fixtures.
Conformance to Standards (Article 7.2.2.2.)
Fixture standards referenced in Sentences (2) to (8) have been relocated as separate
Clauses under revised Sentence (1) with ASME A112.4.2. standard added under
Clause (1)(i) for personal hygiene devices for water closets. Ontario-only Sentence (1)
retained and renumbered as Sentence (0.1).
Traps (Article 7.2.3.1.)
Clause 3(b) has been revised so that only part of the trap is required to be removable
for cleaning purposes.
Clause 3(c) has been removed as an option for cleanout provision when the trap is
installed below the floor without a cleanout plug.
Sentence (4) no longer makes reference to the S-trap.
Interceptors (Article 7.2.3.2.)
The order of Sentences (3) and (4) have been swapped.
Fibrocement Pipe and Fittings (Article 7.2.5.1.)
New Sentence (1) has been added to require fibrocement pipe and fittings for use in
drain, waste or vent systems to conform to CAN/CSA-B127.3.
Concrete Pipe and Fittings (Article 7.2.5.2.)
Article 7.2.5.3. Concrete Pipe and Fittings has been renumbered as Article 7.2.5.2.
Harmonized with 2020 NPC.
Sentence (1) has been updated to reference specific standards CSA A257.1 and 257.2
for concrete pipes.
Sentence (2) has been amended to reference CSA A257.3 for joints with internal
elastomeric gaskets.
Vitrified Clay Pipe and Fittings (Article 7.2.5.3.)
Article 7.2.5.4. Vitrified Clay Pipe and Fittings has been renumbered as Article 7.2.5.3.
Harmonized with 2020 NPC.
Polyethylene Pipe and Fittings (Article 7.2.5.4.)
Article 7.2.5.5. has been renumbered as Article 7.2.5.4. Harmonized with 2020 NPC.
Polyethylene Pipe Used Underground (Article 7.2.5.5.)
Article 7.2.5.6. Polyethylene Pipe and Fittings has been renumbered as Article 7.2.5.5.
Ontario-only provision retained.
Crosslinked Polyethylene Pipe and Fittings (Article 7.2.5.6.)
Article 7.2.5.7. Crosslinked Polyethylene Pipe and Fittings has been renumbered as
Article 7.2.5.6. Harmonized with 2020 NPC.
Sentence (1) has been expanded to allow manufacturer-approved fittings to be used
with PEX tubing, provided that they comply with the referenced standard (CSA B137.5).
PVC Pipe and Fittings (Article 7.2.5.7.)
Article 7.2.5.8. PVC Pipe and Fittings has been renumbered as Article 7.2.5.7.
Harmonized with 2020 NPC.
Sentence (2) is introduced to reference ASTM D2466 and D2467 standards for PVC
water pipe fittings Schedule 40 and 80 respectively.
CPVC Pipe, Fittings and Solvent Cements (Article 7.2.5.8.)
Article 7.2.5.9. CPVC Pipe, Fittings and Solvent Cements has been renumbered as
Article 7.2.5.8. Harmonized with 2020 NPC.
Plastic Pipe, Fittings and Solvent Cement Used Underground (Article 7.2.5.9.)
Article 7.2.5.10. Plastic Pipe, Fittings and Solvent Cement Used Underground has been
renumbered as Article 7.2.5.9. Ontario-only provision retained.
Transition Solvent Cement (Article 7.2.5.10.)
Article 7.2.5.11. Transition Solvent Cement has been renumbered as Article 7.2.5.10.
Harmonized with 2020 NPC.
Plastic Pipe, Fittings and Solvent Cement Used in Buildings (Article 7.2.5.11.)
Article 7.2.5.12. Plastic Pipe, Fittings and Solvent Cement Used in Buildings has been
renumbered as Article 7.2.5.11. Ontario-only provision retained.
Polyethylene/ Aluminum/ Polyethylene Composite Pipe and Fittings (Article
7.2.5.12.)
Article 7.2.5.13. Polyethylene/ Aluminum/ Polyethylene Composite Pipe and Fittings has
been renumbered as Article 7.2.5.12. Harmonized with 2020 NPC.
Crosslinked Polyethylene/ Aluminum/ Crosslinked Polyethylene Composite
Pressure Pipe and Fittings (Article 7.2.5.13.)
Article 7.2.5.14. Crosslinked Polyethylene/ Aluminum/ Crosslinked Polyethylene
Composite Pressure Pipe and Fittings has been renumbered as Article 7.2.5.13.
Harmonized with 2020 NPC.
Polypropylene Pipe and Fittings (Article 7.2.5.14.)
Article 7.2.5.15. has been renumbered as Article 7.2.5.14. Harmonized with 2020 NPC.
Polyethylene of Raised Temperature Tube and Fittings (Article 7.2.5.15.)
This new Article has been added that introduces Polyethylene of Raised Temperature
(PE-RT) as a new acceptable plumbing material and references the CSA B137.18.
Standard. Harmonized with 2020 NPC.
Sentence (2) adds Table 7.2.5.15. for the permitted uses of the PE-RT tube.
Harmonized with 2020 NPC.
Cellular Core PVC Pipe and Fittings (Article 7.2.5.16.)
This new Article has been added that introduces Cellular Core PVC Pipe as an
acceptable plumbing material and references the ASTM F3128 standard. Sentence (1)
additionally references CSA B181.2 for the colour requirements. Harmonized with 2020
NPC.
Sentence (2) references CSA B181.2 for the requirements of fittings and solvent
cements used for cellular core PVC pipe. Harmonized with 2020 NPC.
Sentence (3) limits the use of the cellular core PVC pipe to residential buildings
containing a maximum of 2 dwellings and do not exceed 3 storeys in height.
Harmonized with 2020 NPC.
Cast-Iron Drainage and Vent Pipe and Fittings (Article 7.2.6.1.)
Article 7.2.6.1. has been amended by relocating Sentence (3) to new Article 7.2.6.2.
Maintenance Holes and Catch Basins as Sentence (1). Harmonized with 2020 NPC.
Maintenance Holes and Catch Basins (Article 7.2.6.2.)
Article 7.2.6.2. Reserved has been replaced by new Article 7.2.6.2. Maintenance Holes
and Catch Basins capturing Sentence 7.2.6.1.(3).
Copper and Brass Pipe (Article 7.2.7.1.)
Sentence (1) has been modified into Clauses with Clause (1)(b) added to reference
Table 7.2.7.4. for the permitted use of copper tube and pipe. Harmonized with 2020
NPC.
Copper Tube (Article 7.2.7.4.)
Sentence (3) has been amended to extend the prohibition on the use of copper tube to
all urinals. Harmonized with 2020 NPC.
Lead Waste Pipe and Fittings (Article 7.2.7.8.)
The defined term “size” in Sentence (2) has been replaced with “nominal pipe size” to
align with industry terminology. Harmonized with 2020 NPC.
Valves, Supply and Waste Fittings (Article 7.2.10.6.)
Article 7.2.10.6. title “Supply and Waste Fittings” has been changed to “Valves, Supply
and Waste Fittings”. Harmonized with 2020 NPC.
Sentence (1) provisions have been modified into multi-Clause format.
Sentence (2) has been relocated to Sentence (6).
New Sentence (2) has been relocated from Sentence 7.6.4.1.(1) with amendments for
the maximum flow rates of supply fittings. Harmonized with 2020 NPC.
Ontario-only Sentence (2.1) has been added to provide exemption for fixtures located in
a heritage building and is relocated from Sentence 7.6.4.2.(2).
NPC Sentences (3) to (5) are reserved in this Article to maintain numbering
consistency.
New Sentence (7) has been added to reference standard ASME A112.4.14/ CSA
B125.14 for the requirements of manually operated valves. Harmonized with 2020 NPC.
Water Temperature Control (Article 7.2.10.7.)
Article 7.6.5.1. Maximum Temperature of Hot Water has been amended and relocated
to new Article 7.2.10.7. Water Temperature Control.
Sentences 7.6.5.1.(1) and (2) have been renumbered as Sentences 7.2.10.7.(4) and (6)
respectively with minor edits due to their relocation.
New Sentence 7.2.10.7.(1) has been added that requires water supplied to shower
heads or bathtubs to be controlled by an automatic compensating valve conforming
either to ASME A112.18.1/ CSA B125.15 or ASSE 1016/ ASME A112.1016/ CSA
B125.16 to provide a means of automatically maintaining the selected water
temperature. Harmonized with 2020 NPC.
New Sentence 7.2.10.7.(2) waives the requirement under Sentence (1) for bathtubs
only if the hot water supplied is controlled by an automatic compensating valve
conforming to CSA B125.3 or controlled by a temperature-limiting device conforming to
ASSE 1070/ ASME A112.1070/ CSA B125.70 and provide performance requirements
for temperature-limiting devices. Harmonized with 2020 NPC.
New Sentence 7.2.10.7.(3) waives the requirement under Sentence (1) if the water is
supplied by a single tempered water line controlled by an automatic compensating valve
conforming to CAS B125.3. Harmonized with 2020 NPC.
New Sentence 7.2.10.7.(5) has been introduced to reduce the maximum water
temperature from 49 oC to 43oC in health care facilities and seniors’ residences.
Harmonized with 2020 NPC.
Temperature Control Devices (Article 7.2.10.7A.)
Article 7.6.5.3. Temperature Control Devices has been relocated to new Article
7.2.10.7A. as an Ontario-only provision.
Sentence (1) has been amended to require hot water temperature control devices in
childcare centres.
Showers (Article 7.2.10.7B.)
Article 7.6.5.2. Showers has been relocated to new Article 7.2.10.7B. as an Ontario-only
provision.
Linings and Coatings of Water Storage Tanks (Article 7.2.10.7C.)
Article 7.2.10.7. Linings and Coatings of Domestic Water Tanks has been renumbered
as Article 7.2.10.7C. Linings and Coatings of Water Storage Tanks.
Sentence (1) has been amended to clarify that the existing requirement for linings and
coatings of water tanks that come into contact with potable water are not intended to
apply to domestic tanks that are within a house or an individual dwelling unit. It is
intended for tanks used in other occupancies. Ontario-only provision retained.
Direct Flush Valves (Article 7.2.10.8.)
New Clause (1)(e) has been added to require direct flush valves conform to a new
standard ASSE 1037/ ASME A112.1037/ CSA B125.37. Harmonized with 2020 NPC.
Back-Siphonage Preventers and Backflow Preventers (Article 7.2.10.10.)
The list of standards in Sentence (1) has been expanded by making reference to CSA
B64.4.1., CSA B64.5.1., CSA B64.6.1. and CSA B64.9. Harmonized with 2020 NPC.
Sentence (2) has been amended to introduce a new standard ASSE 1002/ ASME
A112.1002/ CSA B125.12 for back-siphonage preventers for tank type water closets.
Harmonized with 2020 NPC.
Solar Domestic Water Heater (Article 7.2.10.13.)
Sentence (1) has been amended to reference the CSA F379 SERIES for equipment for
solar heating of potable water. Harmonized with 2020 NPC.
Vent Pipe Flashing (Article 7.2.10.14.)
“Alloyed zinc” referenced in Clause (1)(c) is now a defined term. Harmonized with 2020
NPC.
Water Treatment Systems (Article 7.2.10.17.)
The title of Article 7.2.10.17. Drinking Water Treatment Systems has been renamed
Water Treatment Systems.
Flexible Water Connectors (Article 7.2.10.18.)
New Article 7.2.10.18. Flexible Water Connectors introduces requirements for flexible
water connectors by referencing ASME A112.18.6/ CSA B125.6. Harmonized with 2020
NPC.
Tracer Wire (Article 7.2.11.3.)
This Article has been amended to increase options for tracer wire requirements to allow
copper clad steel tracer wires to be used for non-metallic water service pipes or fire
service mains installed underground. Ontario-only provision retained.

 

Section 7.3. Piping

Caulked Lead Drainage Joints (Article 7.3.2.1.)
The Sentences within this Article have been restructured to harmonize with the 2020
NPC.
Wiped Joints (Article 7.3.2.2.)
Sentences (2) and (3) have been reworded to harmonize with the 2020 NPC.
Mechanical Joints (Article 7.3.2.6.)
Sentence (1) has been broken down into two Clauses. Harmonized with 2020 NPC.
Drilled and Tapped Joints (Article 7.3.3.1.)
Sentence (1) has been amended to allow drilled and tapped joints in sanitary drainage
pipe and fittings only if suitable provision for drilling and tapping has been made.
Harmonized with 2020 NPC.
Sentence (2) has been deleted with the remaining Sentences (3) to (5) renumbered as
(2) to (4).
Renumbered Sentence (2) has been revised to address pipe size as “Nominal Pipe
Size” to align with industry terminology. Harmonized with 2020 NPC.
Extracted Tees (Article 7.3.3.2.)
Article 7.3.3.2. Reserved has been replaced by new Article 7.3.3.2. Extracted Tees that
introduces conditions for extracting tees in copper tube used in a water distribution
system such as the required tool, branch size, flow obstruction prevention and joint filler
metal. Harmonized with 2020 NPC.
Unions and Slip Joints (Article 7.3.3.4.)
Sentence (1) which prohibits union joints downstream of a trap weir in a drainage
system or venting system, has been amended to recognise the existing exception in
Sentence 7.4.6.3.(6) which allows the use of union joints for pumped sumps.
Harmonized with 2020 NPC.
Increaser or Reducer (Article 7.3.3.5.)
Sentence (1) addresses pipe size as “Nominal Pipe Size” to align with industry
terminology. Harmonized with 2020 NPC.
Dissimilar Materials (Article 7.3.3.6.)
The title of Article 7.3.3.6. Connection of Dissimilar Materials has been renamed
Dissimilar Materials. Harmonized with 2020 NPC.
Connection of Floor Outlet Fixtures (Article 7.3.3.8.)
New Sentence (5) has been introduced to allow that floor-mounted water closets can be
attached to either the floor or floor flange. Sentence (5) also clarifies the method of
attachment of wall-mounted water closets. Remaining Sentences have also been
restructured and modified to harmonize with 2020 NPC.
Capability of Support (Article 7.3.4.1.)
The Sentences have been restructured to harmonize with the 2020 NPC.
Support for Horizontal Piping (Article 7.3.4.5.)
The requirements listed in Clauses (a) to (m) under Sentence (2) have been relocated
to new Table 7.3.4.5. referenced by this Sentence. The new Table also addresses pipe
size as “Nominal Pipe Size” to align with industry terminology.
Sentence (3) has been amended to now specify PVC, CPVC or ABS plastic types for
hangar support.
Sentence (4) Reserved has been replaced with new Sentence (4) containing additional
hangar restrictions for PEX, PE-RT, PP-R, PE/AL/PE or PEX/AL/PEX plastic pipe.
Article harmonized with 2020 NPC.
Support for Vent B Pipe Above a Roof (Article 7.3.4.7.)
Sentence (1) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Thrust Restraint of Water Service Pipes (Article 7.3.4.9.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Protection of Piping (Article 7.3.5.1.)
Title of Article 7.3.5.1. Backfill of Pipe Trench has been renamed Protection of Piping.
Ontario-only provision retained.

Protection of Non-Metallic Pipe (Article 7.3.5.1A.)
Article 7.3.5.2. Protection of Non-Metallic Pipe has been renumbered as Article
7.3.5.1A. Ontario-only provision retained.
Isolation from Loads (Article 7.3.5.2.)
Article 7.3.5.3. Isolation from Loads has been renumbered as Article 7.3.5.2.
Harmonized with 2020 NPC.
Protection Against Freezing (Article 7.3.5.3.)
Article 7.3.5.4. Protection from Frost has been renamed Protection Against Freezing
and renumbered as Article 7.3.5.3. Harmonized with 2020 NPC.
Protection from Mechanical Damage (Article 7.3.5.4.)
Article 7.3.5.5. Protection from Mechanical Damage has been renumbered as Article
7.3.5.4. Harmonized with 2020 NPC.
Spatial Separation (Article 7.3.5.6.)
Article 7.3.5.7. Spatial Separation has been renumbered as Article 7.3.5.6. Harmonized
with 2020 NPC.
Tests of Pipes in Drainage System (Article 7.3.6.2.)
Sentence (1) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Tests of Venting Systems (Article 7.3.6.3.)
Sentence (1) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Water Pressure Tests (Article 7.3.6.4.)
Title of Article 7.3.6.4. Water Tests in Drain, Waste and Vent Systems has been
renamed Water Pressure Tests.
Sentence (1) has been reworded to match the National. It prescribes the water column
pressure test at least 3 m from all joints. Harmonized with 2020 NPC.
Air Pressure Tests (7.3.6.5.)
Title of Article 7.3.6.5. Air Tests has been renamed Air Pressure Tests.
Sentence (1) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Ball Tests (Article 7.3.6.7.)
Sentences (1) and (2) have been reworded to match the National.
Sentence (2) has been expanded to require the test ball diameter to be not less than 25
mm where the size of the pipe is less than NPS 3. Harmonized with 2020 NPC.
Sentence (2) additionally addresses pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Application of Tests (Article 7.3.7.1.)
Sentences (2) and (3) have been reworded to match the National. There are no
technical changes. Harmonized with 2020 NPC.
Pressure Tests of Potable Water Systems (Article 7.3.7.2.)
Title of Article 7.3.7.2. Tests of Potable Water Systems has been renamed Pressure
Tests of Potable Water Systems. Harmonized with 2020 NPC.
Water Pressure Tests (Article 7.3.7.3.)
Title of Article 7.3.7.3. Water Tests has been renamed Water Pressure Tests. There are
no technical changes. Harmonized with 2020 NPC.

 

Section 7.4. Drainage Systems

General (Article 7.4.1.1.)
Title of Article 7.4.1.1. Application of Drainage Systems has been renamed General.
Harmonized with 2020 NPC.
Connections to Sanitary Drainage Systems (Article 7.4.2.1.)
Subclause (1)(a)(ii) has been amended to require a backwater valve to be installed in
the fountain fixture drain when the system is subject to backflow, which applies to
drinking fountains connected to a storm drainage system. Harmonized with 2020 NPC.
Direct Connections (Article 7.4.2.3.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.

Equipment Restrictions Upstream of Grease Interceptors (Article 7.4.3.3.)
Title of Article 7.4.3.3. Equipment Restrictions Upstream of Interceptors has been
renamed Equipment Restrictions Upstream of Grease Interceptors.
Cooling of Hot Water or Sewage (Article 7.4.4.2.)
Title of Article Protection for Drainage System has been renamed Cooling of Hot Water
or Sewage. Harmonized with 2020 NPC.
Interceptors (Article 7.4.4.3.)
The numbering of the Sentences within this Article has been restructured to match the
National.
Ontario-only provisions retained for Sentences (1), (2), (2.1), (5), (6), (7), (8) and (9).
Neutralizing and Dilution Tanks (Article 7.4.4.4.)
Sentences (1) and (2) have been reworded to match the National. There are no
technical changes. Harmonized with 2020 NPC.
Traps for Sanitary Drainage Systems (Article 7.4.5.1.)
Sentence (1) has been amended to include new Sentence (5) as an exception for
fixtures to be protected by a separate trap. Harmonized with 2020 NPC.
New Sentence (5) has been introduced to allow an interceptor with an effective water
seal of not less than 38 mm to serve as a trap. Harmonized with 2020 NPC.
Traps for Storm Drainage Systems (Article 7.4.5.2.)
New Sentence (2) has been introduced to set the requirements for the trap that protects
a floor drain connected to a storm drainage system. Harmonized with 2020 NPC.
Connection of Subsoil Drainage Pipe to a Sanitary Drainage System (Article
7.4.5.3.)
Sentence (3) has been renumbered as Sentence (1) and harmonizes with technical
requirements of 2020 NPC.

Sentences (2) and (3) are maintained as Ontario-only provisions.
Trap Seals (Article 7.4.5.5.)
Sentence (1) has been restructured to match the National. Harmonized with 2020 NPC.

Separate Systems (Article 7.4.6.1.)
The Sentences within this Article have been restructured to match the National.
Harmonized with 2020 NPC.
Location of Sanitary Drainage Pipes (Article 7.4.6.2.)
Title of Article 7.4.6.2. Location of Soil or Waste Pipes has been renamed Location of
Sanitary Drainage Pipes to harmonize with 2020 NPC.
Sentence (1) has been updated to reflect the new Article title.
Sumps or Tanks (Article 7.4.6.3.)
New Sentence (3) has been added to require a water and air-tight cover where the
sump or tank receives subsurface water from a subsoil drainage pipe. Harmonized with
2020 NPC.
Mobile Home Sewer Service (Article 7.4.6.5.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Cleanouts for Drainage Systems (Article 7.4.7.1.)
New Sentence (5) has been added that allows change in direction for pipes of Nominal
Pipe Size not more than 6, under certain conditions. Harmonized with 2020 NPC.
Sentence (7) has been reworded and the associated Clause (b) has been amended to
require a cleanout fitting not more than 3 m upstream of the bottom of the stack.
Harmonized with 2020 NPC.
Size and Spacing of Cleanouts (Article 7.4.7.2.)
The Sentences within this Article have been revised to address pipe size as “Nominal
Pipe Size” to align with industry terminology. Harmonized with 2020 NPC.
Sentence (1) has been revised to include exception for Sentence 7.4.7.1.(6). The
permitted size and spacing of cleanouts are reorganized into new Table 7.4.7.2.
Harmonized with 2020 NPC.
Sentence (3) has been amended to increase the maximum developed length of a
building sewer between the building and the first manhole to which the sewer connects
from 30 m to 75 m. Harmonized with 2020 NPC.

Location of Cleanouts (Article 7.4.7.4.)
Sentence (5) has been revised to add the word “drains” to limit the application of the
requirements only to the drain of a fixture receiving hazardous waste. Sentence (5) is
now harmonized with the 2020 NPC.
Sentence (4.1) has been retained as an Ontario-only provision.
Minimum Slope (Article 7.4.8.1.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Serving Water Closets (Article 7.4.9.2.)
The Sentences within this Article have been revised to address pipe size as “Nominal
Pipe Size” to align with industry terminology. Harmonized with 2020 NPC.
Size of Fixture Outlet Pipes (Article 7.4.9.3.)
The Sentences within this Article have been revised to address pipe size as “Nominal
Pipe Size” to align with industry terminology. Harmonized with 2020 NPC.
Note (2) has been added to Table 7.4.9.3. to clarify that there is no requirement for
hydraulic load for emergency floor drains. Harmonized with 2020 NPC.
Sentence (3) has been amended to specify sizing requirements in terms of the clothes
washer trap inlet to be not less than NPS 2, applicable to clothes washers not draining
into laundry trays.
New Sentence (4) has been added to specify a fixture outlet pipe of not less than NPS 2
where multiple shower heads are served by one shower receptacle in a dwelling unit.
Ontario-only provision.
Minimum Size of Building Drain and Sewer (Article 7.4.9.4.)
Sentences (1) and (2) are reworded to match the National. Harmonized with 2020 NPC.
Offset in Leaders (Article 7.4.9.5.)
Sentences 7.4.10.10.(1) and (2) in Article 7.4.10.10. Rain Leaders have been relocated
to Sentences 7.4.9.5.(1) and (2) in new Article 7.4.9.5. Offset in Leaders. Harmonized
with 2020 NPC.
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.

Hydraulic Loads for Fixtures (Article 7.4.10.2.)
Sentence (2) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Hydraulic Loads from Fixtures with a Continuous Flow (Article 7.4.10.3.)
Title of Article 7.4.10.3. Hydraulic Loads from Fixtures with Continuous or SemiContinuous Flow has been renamed Hydraulic Loads from Fixtures with a Continuous
Flow. Harmonized with 2020 NPC.
Sentence (2) has been amended to address flow drains to a combined sewer or a storm
sewer. Harmonized with 2020 NPC.
Sentence (3) has been relocated to Sentence 7.4.10.12.(1) in new Article 7.4.10.12.
Harmonized with 2020 NPC.
Hydraulic Loads to Soil or Waste Pipes (Article 7.4.10.6.)
New Table 7.4.10.6-B which has been added and referenced by Sentence (2), expands
the requirements under Table 7.4.10.7. (now deleted) for maximum permitted hydraulic
load drained to a branch. Harmonized with 2020 NPC.
New Table 7.4.10.6-C which has also been added and referenced by Sentence (2),
replaces the requirements under Table 7.4.10.8. (now deleted) for maximum permitted
hydraulic load drained to a sanitary building drain or sewer. Harmonized with 2020
NPC.
Hydraulic Loads on Branches (Article 7.4.10.7.)
Reference to Table 7.4.10.7. in Sentence (1) has been deleted and replaced by new
Table 7.4.10.6.-B. for hydraulic load that is drained to a branch. Harmonized with 2020
NPC.
Hydraulic Loads on Sanitary Building Drains or Sewers (Article 7.4.10.8.)
Title of Article 7.4.10.8. Hydraulic Loads on Sanitary Horizontal Drain has been
renamed Hydraulic Loads on Sanitary Building Drains or Sewers. Harmonized with
2020 NPC.
Reference to Table 7.4.10.8. in Sentence (1) has been deleted and replaced by Table
7.4.10.6.-C. for hydraulic load that is drained to a sanitary building drain or sanitary
building sewer. Harmonized with 2020 NPC.
Ontario-only Sentence 7.4.10.8.(2) is retained.

Hydraulic Loads on Storm or Combined Building Drains or Sewers (Article
7.4.10.9.)
Title of Article 7.4.10.9. Hydraulic Loads on Horizontal Storm Drains has been renamed
Hydraulic Loads on Storm or Combined Building Drains or Sewers. Harmonized with
2020 NPC.
Hydraulic Loads to Roof Gutters (Article 7.4.10.10.)
Sentence (1) in new Article 7.4.10.10. Hydraulic Loads to Roof Gutters references Table
7.4.10.10. for hydraulic loads drained to roof gutters. Harmonized with 2020 NPC.
Hydraulic Loads on Leaders (Article 7.4.10.11.)
Article 7.4.10.10. Rain Leaders has been renumbered as Article 7.4.10.11. Hydraulic
Loads on Leaders with retention of Sentence 7.4.10.10.(3) as Sentence 7.4.10.11.(1).
Harmonized with 2020 NPC.
Sentences 7.4.10.10.(1) and (2) have been relocated to new Article 7.4.9.5. Offset in
Leaders. Harmonized with 2020 NPC.
Table 7.4.10.11. referenced in Sentence (1) has been expanded to address non-circular
leaders, in addition to circular leaders. Harmonized with 2020 NPC.
Hydraulic Loads from Fixtures with a Semi-continuous Flow (Article 7.4.10.12.)
Sentence (1) in new Article 7.4.10.12. Hydraulic Loads from Fixtures with a Semicontinuous Flow captures the relocation of Sentence 7.4.10.3.(3). Harmonized with
2020 NPC.

 

Section 7.5. Venting Systems

 

Venting for Traps (Article 7.5.1.1.)
Sentence (2) has been reworded to match National. There are no technical changes.
Harmonized with 2020 NPC.
Sentence (3) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Wet Venting (Article 7.5.2.1.)
Sentence (1) has been reworded to match National. There are no technical changes.
Harmonized with 2020 NPC.

Clauses (1)(i) and (1)(j) have been revised to address pipe size as “Nominal Pipe Size”
to align with industry terminology. Harmonized with 2020 NPC.
Circuit Vent (Article 7.5.3.1.)
Sentence (1) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Sentences (2), (7) and (9) have been revised to address pipe size as “Nominal Pipe
Size” to align with industry terminology. Harmonized with 2020 NPC.
Vent Pipes for Stacks (Article 7.5.4.1.)
In Sentence (1) “soil or waste stack” has been replaced with “stack”. Ontario-modified
provision retained.
Vent Stacks (7.5.4.2.)
In Sentence (1) “soil or waste stack” has been replaced with “stack”. Harmonized with
2020 NPC.
Yoke Vents (Article 7.5.4.3.)
Sentence (1) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Offset Relief Vents (7.5.4.4.)
Sentence (1) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Fixture Draining into Vent Pipe (Article 7.5.4.5.)
Sentence (1) has been amended to require the section of the vent pipe that acts as a
wet vent to be not less than NPS 2. Harmonized with 2020 NPC.
Venting on Sanitary Sewage Sump (Article 7.5.5.1.)
Sentence (1) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Venting of Interceptors (Article 7.5.5.2.)
Sentences (3), (4) and (5) have been reworded to match the National. There are no
technical changes. Harmonized with 2020 NPC.
Sentences (6) and (7) addressing grease interceptors have been combined in revised
Sentence (6). Clause (6)(b) clarifies the vent size requirement for grease interceptors,
such that the vent pipe to be not larger than NPS 2. Ontario-only modified provisions
retained.
Sentence (8) has been renumbered as Sentence (7). Ontario-only provisions retained.
Venting of Drain Piping and Dilution Tanks for Corrosive Waste (Article 7.5.5.3.)
Sentence (1) has been reworded to match the National. Harmonized with 2020 NPC.
Fresh Air Inlets (Article 7.5.5.4.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. There are no technical changes. Harmonized with 2020 NPC.
Provisions for Future Installations (Article 7.5.5.5.)
Sentence (2) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Drainage of Vent Pipes (Article 7.5.6.1.)
Sentences (1) and (2) have been reworded to match the National. Harmonized with
2020 NPC.
Vent Pipe Connections (Article 7.5.6.2.)
Sentences (1) and (2) have been reworded to match the National. There are no
technical changes. Harmonized with 2020 NPC.
Location of Vent Pipes (Article 7.5.6.3.)
Sentences (1) to (3) have been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.
Sentence (5) allowing connection of the vent pipe from a water closet or any other
fixture with integral symphonic flushing has been deleted. Harmonized with 2020 NPC.
Terminals (Article 7.5.6.5.)
Sentences (3) and (6) in this Article has been revised to address pipe size as “Nominal
Pipe Size” to align with industry terminology. Harmonized with 2020 NPC.
General (Article 7.5.7.1.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Size Restrictions (Article 7.5.7.2.)
Sentences (1) to (3) have been reworded to match the National and address pipe size
as “Nominal Pipe Size” to align with industry terminology. There are no technical
changes. Harmonized with 2020 NPC.
Additional Circuit Vents and Relief Vents (Article 7.5.7.3.)
Sentences (1) and (2) have been revised to address pipe size as “Nominal Pipe Size” to
align with industry terminology. Harmonized with 2020 NPC.
Sentence (2) now applies to the sanitary drainage pipe instead of a soil or waste pipe.
Harmonized with 2020 NPC.
Offset Relief Vents (7.5.7.4.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Yoke vents (Article 7.5.7.5.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Vent Pipes for Manholes (Article 7.5.7.6.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Vents for Sewage Sumps, Neutralizing and Dilution Tanks, and Macerating Toilet
Systems (Article 7.5.7.7.)
Sentence (1) has been amended to add “neutralization tanks” to the requirements for
the sizing of vents for dilution tanks. Harmonized with 2020 NPC.
Sentences (1) to (3) have been revised to address pipe size as “Nominal Pipe Size” to
align with industry terminology. Harmonized with 2020 NPC.
Hydraulic Loads Draining to Wet Vents (Article 7.5.8.1.)
Sentence (2) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Individual Vents and Dual Vents (Article 7.5.8.2.)
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology. Harmonized with 2020 NPC.
Branch Vents, Vent Headers, Continuous Vents and Circuit Vents (Article 7.5.8.3.)
Sentence (1) is reworded to match the National. No technical changes. Harmonized
with 2020 NPC.
Table 7.5.8.3. has been revised to address pipe size as “Nominal Pipe Size” to align
with industry terminology. Harmonized with 2020 NPC.
Vent Stacks or Stack Vents (Article 7.5.8.4.)
Provisions in this this Article have been revised to address pipe size as “Nominal Pipe
Size” to align with industry terminology. Harmonized with 2020 NPC.
Air Admittance Valves (Article 7.5.9.2.)
Sentence (2) has been amended to require air admittance valves to be located not less
than 100 mm above the fixture drain being vented. Harmonized with 2020 NPC.
Installation Conditions (Article 7.5.9.3.)
Sentence (5) has been reworded to match the National. There are no technical
changes. Harmonized with 2020 NPC.

 

Section 7.6 Potable Water Systems

General (Article 7.6.1.1.)
Sentence (1) has been reworded to match the National. No technical changes.
Harmonized with 2020 NPC.
Control and Shut-Off Valves (Article 7.6.1.3.)
Sentence 7.6.1.3.(4) has been amended and renumbered as Sentence (2).
Harmonized with 2020 NPC.
Sentence 7.6.1.4.(1) has been amended and relocated to new Sentence (3).
Harmonized with 2020 NPC.

Sentence 7.6.1.5.(1) has been relocated to new Sentence (4). Harmonized with 2020
NPC.
Sentence 7.6.1.6.(1) has been amended and relocated to new Sentence (5).
Harmonized with 2020 NPC.
New Sentence (6) has been added to address shut-off valves in non-residential
buildings. Harmonized with 2020 NPC.
New Sentence (7) has been added to address location of shut off valves to pipes
supplying water from hot water tanks. Harmonized with 2020 NPC.
Ontario-only provisions in Sentences (2), (3), (5) and (6) are retained and renumbered
as Sentences (2.1), (2.2), (8) and (9) respectively.
Public Washrooms (Article 7.6.1.3A.)

Article 7.6.1.7. Public Washrooms has been relocated to new Article 7.6.1.3A. Ontario-
only provision retained.

Tanks (Article 7.6.1.3B.)
Article 7.6.1.8. Tanks has been relocated to new Article 7.6.1.3B. Ontario-only provision
retained.
Protection for Exterior Water Supply (Article 7.6.1.4.)
Article 7.6.1.9. Protection for Exterior Water Supply has been relocated to Article
7.6.1.4. Harmonized with 2020 NPC.
Check Valves (Article 7.6.1.5.)
Article 7.6.1.10. Check Valves has been relocated to Article 7.6.1.5. Harmonized with
2020 NPC.
Flushing Devices (Article 7.6.1.6.)
Article 7.6.1.11. Flushing Devices has been relocated to Sentences 7.6.1.6.(1) and (2).
Harmonized with 2020 NPC.
Sentence 7.6.4.2.(2) has been relocated to Sentence 7.6.1.6.(3) and reworded to match
the National. Table 7.6.1.6.-A is maintained as an Ontario-only provision.
Sentence 7.6.4.2.(3) has been relocated to Sentence 7.6.1.6.(4). Ontario-only provision
retained.
Sentence 7.6.4.2.(4) has been relocated to Sentence 7.6.1.6.(4.1). Ontario-only
provision retained.
Sentence 7.6.4.2.(5) has been relocated to Sentence 7.6.1.6.(5) and amended to
specifically apply to flush-tank type urinals. Ontario-only modified provision retained.
Relief Valves (Article 7.6.1.7.)
Article 7.6.1.12. Relief Valves has been relocated to Article 7.6.1.7. Harmonized with
2020 NPC.
Sentences are reworded to match the National. No technical changes.
Solar Domestic Hot Water Systems (Article 7.6.1.8.)
Article 7.6.1.13. Solar Domestic Hot Water System has been amended and relocated to
Article 7.6.1.8. Harmonized with 2020 NPC.
Sentence 7.6.1.13.(1) has been deleted from Article 7.6.1.8.
Water Hammer (Article 7.6.1.9.)
Article 7.6.1.14. Water Hammer has been relocated to Article 7.6.1.9. Harmonized with
2020 NPC.
Mobile Home Water Services (Article 7.6.1.10.)
Article 7.6.1.15. Mobile Home Water Service has been relocated to Article 7.6.1.10.
Harmonized with 2020 NPC.
Sentence (1) has been revised to address pipe size as “Nominal Pipe Size” to align with
industry terminology.
Thermal Expansion (Article 7.6.1.11.)
Article 7.6.1.16. Thermal Expansion has been relocated to Article 7.6.1.11. and
reworded to match the National. No technical changes. Harmonized with 2020 NPC.
Connection of Systems (Article 7.6.2.1.)
Numbering system in Article 7.6.2.1. has been modified to harmonize with 2020 NPC
numbering system.
Sentence (1) remains unchanged as Ontario-modified by not having exception to NPC
Sentence (2).
New Sentence (2) introduced from 2020 NPC has been reserved in this Article.
Sentence (2) has been renumbered as Sentence (3.1) and retained as an Ontario-only
provision.
New Sentence (3) has been added to require backflow preventers to conform to CSA
B64.10. Harmonized with 2020 NPC.
Back-Siphonage (Article 7.6.2.2.)
Sentence (1) has been reworded to match the National. No technical changes.
Sentence (3) has been deleted.
Backflow Caused by Back Pressure (Article 7.6.2.3.)
Title of Article 7.6.2.3. Protection from Backflow has been renamed Backflow Caused by
Back Pressure to match the National.
Ontario-only provisions in Sentences (1) to (3) of this Article retained.
Backflow from Fire Protection System (Article 7.6.2.4.)
This Article has been amended to harmonize with the 2020 NPC.
Backflow from Buildings with a Solar Domestic Hot Water System (Article
7.6.2.5A.)
Article 7.6.2.5. Backflow from Buildings with a Solar Domestic Hot Water System has
been renumbered as Article 7.6.2.5A. No technical changes. Ontario-only provision
retained.
Hose Bibb (Article 7.6.2.7.)
Sentence 7.6.2.2.(3) has been renumbered as 7.6.2.7.(1) and relocated to reserved
Article 7.6.2.7. which has been renamed 7.6.2.7. Hose Bibb. Harmonized with 2020
NPC.
Cleaning of Systems (Article 7.6.2.8.)
Sentence (1) has been reworded to match the National. No technical changes.
Harmonized with 2020 NPC.
Air Gap (Article 7.6.2.9.)
Sentence (2) has been reworded to match the National. No technical changes. Article
harmonized with 2020 NPC.
Vacuum Breakers (Article 7.6.2.10.)
Title of Article 7.6.2.10. Vacuum Breakers and Flood Levels has been renamed Vacuum
Breakers to match the National.
Sentence (2) has been reworded to match the National. Article harmonized with 2020
NPC.
Tank-Type Water Closets (Article 7.6.2.11.)

New Article 7.6.2.11. has been added to require a back-siphonage preventer for tank-
type water closets. Harmonized with 2020 NPC.

Design, Fabrication and Installation (Article 7.6.3.1.)
Title of Article 7.6.3.1. Design, Construction and Installation has been renamed Design,
Fabrication and Installation to match the National.
Sentence (2) has been reworded to match the National. No technical changes.
New Sentence (3) introduced from 2020 NPC has been reserved in this Article.
Ontario-only Sentence (3) has been renumbered as Sentence (4).
Static Pressure (Article 7.6.3.3.)
Sentence (1) has been reworded to match the National. No technical changes.
Harmonized with 2020 NPC.
Size (7.6.3.4.)
Sentences (1) to (6) have been reworded to match the National. No technical changes.
Harmonized with 2020 NPC.
Water Supply Fittings (Article 7.6.4.1.)
Sentence 7.6.4.1.(1) has been amended and relocated to Sentence 7.2.10.6.(2).
Sentence 7.6.4.1.(2) has been relocated to Sentence 7.2.10.6.(2.1).

Sentences 7.6.4.1.(3) to (5) have been renumbered as Sentences (1) to (3). Ontario-
only Article 7.6.4.1. retained.

Plumbing Fixtures (7.6.4.2.)
This Article has been deleted with provisions relocated to Article 7.6.1.6.
Maximum Temperature of Hot Water (Article 7.6.5.1.)
This Article has been deleted with provisions relocated to new Article 7.2.10.7.
Showers (Article 7.6.5.2.)
This Article has been deleted with provisions relocated to new Article 7.2.10.7B.
Temperature Control Devices (Article 7.6.5.3.)
This Article has been deleted with provisions relocated to new Article 7.2.10.7A.

 

Section 7.7. Non-Potable Water Systems

Non-Potable Water Systems (Subsection 7.7.1.)
This Subsection clarifies the requirements relating to non-potable water systems. This
Subsection also enables the inclusion of requirements for water recovery systems.
General (Article 7.7.1.1.)
Sentence (1) has been revised to ensure that non-potable water systems are designed,
fabricated and installed in accordance with good engineering practice. The explanatory
note gives examples of documents that can be followed. Harmonized with 2020 NPC.
Sentence (2) replaced by new provisions that describe the fixtures and systems allowed
to be supplied by non-potable water systems. Harmonized with 2020 NPC.
New Sentence (3) has been added that prohibits the use of non-potable water systems
in healthcare facilities. Harmonized with 2020 NPC.
New Sentence (4) has been added to ensure that potable water systems are safely
connected to non-potable water systems. Harmonized with 2020 NPC.
New Sentence (5) has been added to align the maximum static pressure of 550 kPa for
a fixture in a non-potable water system with Article 7.6.3.3. Harmonized with 2020 NPC.
Ontario-only Sentence (3) has been retained and renumbered as Sentence (6) which
deals with protection of potable water systems where clothes washers are supplied by a
rainwater system and a potable water system.
Identification and Marking (Article 7.7.1.2.)
Title of Article 7.7.2.1. Markings Required has been renamed Identification and Marking
and relocated to Article 7.7.1.2.
Ontario-only Sentences (0.1) and (2) are retained.
Location of Pipes (Article 7.7.1.3.)
Title of Article 7.7.3.1. Pipes has been renamed Location of Pipes and relocated to
Article 7.7.1.3.
Harmonized with the 2020 NPC with the exception of Ontario-only provision in Clause
(1)(c) for food handling equipment which has been retained.
Location of Outlets (Article 7.7.1.4.)
Article 7.7.3.2. Outlets has been relocated to Article 7.7.1.4. Harmonized with 2020
NPC except for Clause (1)(0.a) retained as an Ontario-only provision.
Non-Potable Rainwater Harvesting Systems (Subsection 7.7.2.)
New requirements have been introduced for non-potable rainwater harvesting systems.
This Subsection also clarifies the permission for storm water and grey water reuse.
General (Subsection 7.7.2.1.)
New Article 7.7.2.1. has been added that defines the scope of the new rainwater
harvesting requirements. Harmonized with 2020 NPC.
Permitted Applications (Subsection 7.7.2.2.)
New Article 7.7.2.2. has been added that limits the supply of harvested rainwater to
applications and fixtures where food consumption, drinking and food preparation are
unlikely. Harmonized with 2020 NPC.
Roof Design (Subsection 7.7.2.3.)
New Article 7.7.2.3. has been added that introduces requirements for the design of
roofs that supply rainwater harvesting systems. Harmonized with 2020 NPC.
Non-Potable Rainwater Harvesting System Design (Subsection 7.7.2.4.)
New Article 7.7.2.4. has been added that introduces requirements for the design of
rainwater harvesting systems. Harmonized with 2020 NPC.
Conformance to Standards (Article 7.7.3.1.)
Article 7.7.4.1. Conformance to Standards has been renumbered as Article 7.7.3.1.
Ontario-only provisions retained