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Wet VentingIncorporating Stack Venting and

NPC Harmonization

ONTARIO PLUMBING INSPECTORS ASSOCIATION INC.In the public service since 1920

OPIA Education and Training

Presented by:Rainier Bratsch-Blundel, CPSIPlumbing Professor – George Brown College

1

1 ¼”1 ¼”

1 ¼”

1 ½”

(e)

Wet Venting – Correct or Incorrect

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

1 ½”

3”

1 ¼”

1 ½”

2”

3”

1 ¼”

1 ½”

2”1 ½”

1 ¼”

1 ½”

(a)

3”

1 ¼”

1 ½”

1 ½”

2”

2” C/O

(b)

(c)

(d)

3”

1 ¼”

1 ½”

2”1 ½”

1 ½”

1 ½”

2”

• In the 2006 OBC, All Wet Venting requirements changed.

• Wet venting now includes– Stack Venting,– Modified Stack Venting, and the new– Multi-Storey Wet Venting

Rainier Blundel / Bryan Heyl George Brown College 3

7.5.2.1. Wet Venting

• Any fixture can be wet vented.• Any fixture other than a Water Closet (W.C.) can

do the wet venting• Symphonic fixtures can do the Wet Venting• Only fixtures with 2-inch trap arms and fixture

drains can connect into the wet vent above a W.C. (there is a 3-inch floor drain exception).

• The lowest connecting fixture is NOT included in the sizing of the wet vent.

Rainier Blundel / Bryan Heyl George Brown College 4

Wet Venting

• Wet Vent means a waste pipe that also serves as a Vent Pipe.

• Continuous Vent means a vent pipe that is an extension of a vertical section of a branch OR fixture drain.

• Fixture Unit means … the unit of measure … that expresses the hydraulic load … on the drainage system

Rainier Blundel / Bryan Heyl George Brown College 5

Wet Venting

7.5.2.1 Wet Venting(1) A soil or waste pipe may serve as a wet vent provided

that,(a) the hydraulic load is in accordance with Table 7.5.8.1.

7.5.8.1. Hydraulic Loads Draining to Wet Vents(1) The hydraulic load that drains to a wet vent shall conform to Table 7.5.8.1.(2) When determining the size of a wet vent, the hydraulic load from the most downstream fixture or symmetrically connected fixtures shall not be included.

6Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

Wet Venting

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.

3” 12 F.U. 8 F.U.

4” 36 F.U. 14 F.U.

5” - 18 F.U.6” - 23 F.U.

Column 1 Column 2 Column 3

7

Maximum Permitted Hydraulic Loads Drained to a Wet Vent

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.3” 12 F.U. 8 F.U.4” 36 F.U. 14 F.U.5” - 18 F.U.6” - 23 F.U.

Column 1 Column 2 Column 3

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

Wet Vent Sizing (Table 7.5.8.1.)

• 3” wet vent (replaces old Stack Venting)– 1 or 2 water closets installed

• 8 fixture units maximum – 2” maximum above the lowest connecting fixture

8

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.

1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.

3” 12 F.U. 8 F.U.

4” 36 F.U. 14 F.U.

5” - 18 F.U.

6” - 23 F.U.

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.

1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.

3” 12 F.U. 8 F.U.

4” 36 F.U. 14 F.U.

5” - 18 F.U.

6” - 23 F.U.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

Wet Vent Sizing (Table 7.5.8.1.)

9 (i)

a) the hydraulic load is in accordance with Table 7.5.8.1.

Continuous Vent7 metres

Bathtub

(1) A soil or waste pipe may serve as a wet vent provided:

2” shower

drain

Tank W.C.

Basin

Kitchen Sink

1 F.U.

1.5 F.U.

1.5 F.U.

3 F.U.

11 F.U.1 ½” pipe

Wet Vent (branch)7 F.U. (8 max.)3” pipe

Wet Vent (branch)7 F.U. (8 max.)3” pipe

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

7.5.2.1. Wet Vent Sizing

9 (ii)

7.5.8.3.(5) For the purposes of Table 7.5.8.3., the length of a

continuous vent shall be its developed length from the vertical soil or waste pipe connection to a vent stack, stack vent, header or open air.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

7.5.2.1. Wet Vent Sizing

9 (iii)Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

7.5.2.1. Wet Vent Sizing

7.5.2.1. Wet Venting

Rainier Blundel George Brown College 10 (i)

c) when 2 water closets are installed, they are connected at the same level to a verticalpart of the stack by means of a double fitting in accordance with Table 7.2.4.5.,

Continuous Vent

basin

Bath Tub

Wet vent

BranchFixture Units = 12Size = 3”

5 F.U. (8 max.)Size = 3” pipe

Fixture Units = 123 metres

Size = 1 ½” Pipe

b) the number of wet vented water closets does not exceed 2

Tank W.C.

Bath Tub

Tank W.C.

basin

Rainier Blundel George Brown College 10 (ii)

Rainier Blundel George Brown College 10 (iii)

11 (i)

d) the water closets are installed downstream of all other fixtures (on the wet vent)

Tank W.C.

Bath tub

Wet Vent (fixture drain)2.5 F.U. 2” Pipe

Continuous vent6 F.U. (BG)10 metres1 ½” Pipe

Basin

1 F.U.

1.5 F.U.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

7.5.2.1. Wet Venting

11 (ii)

d) the water closets are installed downstream of all other fixtures (on the wet vent)

Tank W.C.

Bath tub

Wet Vent (fixture drain)2.5 F.U. 2” Pipe

Continuous vent6 F.U. (BG)10 metres1 ½” Pipe

Basin

1 F.U.

1.5 F.U.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

7.5.2.1. Wet Venting

12

e) trap arms and fixture drains connected to the wet vent do not exceed 2 in. in size, except for connections from floor drains in accordance with Sentence 7.5.1.1.(3)(a) to (c),

Continuous Vent5 metres

3” Floor Drain

Tank W.C.

Basin

1 F.U.

3 F.U.

5 F.U.1 ½” pipe

Wet Vent (branch)1 F.U. (3 max.)3” pipe

Wet Vent (fixture drain)1 F.U. (3 max.)2” pipe

Note:

A-Table 7.4.9.3. Hydraulic Loads.Hydraulic Loads for Floor Drains.

No hydraulic load is required from a floor drain in a washroom since it is for emergency use only.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

No load

7.5.2.1. Wet Vent Sizing

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.

3” 12 F.U. 8 F.U.

4” 36 F.U. 14 F.U.

5” - 18 F.U.6” - 23 F.U.

Column 1 Column 2 Column 3

13

Maximum Permitted Hydraulic Loads Drained to a Wet Vent

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

Wet Vent Sizing (Table 7.5.8.1.)

• 1 ½” wet vent– No water closet installed

• 2 fixture units maximum (2” maximum)– Above the lowest connecting fixture

14

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.

1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.

3” 12 F.U. 8 F.U.

4” 36 F.U. 14 F.U.

5” - 18 F.U.

6” - 23 F.U.

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.

1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.

3” 12 F.U. 8 F.U.

4” 36 F.U. 14 F.U.

5” - 18 F.U.

6” - 23 F.U.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

Wet Vent Sizing (Table 7.5.8.1.)

15 (i)

A Laundry Tray (Tub) wet venting through a Floor Drain

F.D.

1 ½”Wet Vent

2 F.U. max.

1 ½”Continuous

Vent

1 ½”(1.5 F.U)

2”3”4”

Washing Machine

Stand Pipe (no load)

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

Wet Vent Sizing (Table 7.5.8.1.)

15 (ii)

A Laundry Tray (Tub) wet venting through a Floor Drain

F.D.

1 ½”Wet Vent

2 F.U. max.

1 ½”Continuous

Vent

1 ½”(1.5 F.U)

2”3”4”

Washing Machine

Stand Pipe (no load)

A-Table 7.4.9.3. Hydraulic Loads.

Hydraulic Loads for Laundry Traps.When determining the hydraulic load on a pipe, no allowance need be made for a load from a domestic clothes washer when discharged into a laundry tray, since the hydraulic load from the laundry tray is sufficient.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

Wet Vent Sizing (Table 7.5.8.1.)

• 2” wet vent– No water closet installed

• 4 fixture units maximum (2” maximum)– Above the lowest connecting fixture

16

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.

1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.

3” 12 F.U. 8 F.U.

4” 36 F.U. 14 F.U.

5” - 18 F.U.

6” - 23 F.U.

Size of Wet Vent(inches)

Maximum Hydraulic Load, Fixture Units

No Water ClosetsNot more than 2 W.C.’s

Fixtures Other Than a W.C.

1 ½” 2 F.U. -

2” 4 F.U. 3 F.U.

3” 12 F.U. 8 F.U.

4” 36 F.U. 14 F.U.

5” - 18 F.U.

6” - 23 F.U.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

Wet Vent Sizing (Table 7.5.8.1.)

17

A Lavatory Basin and a Bathtub wet venting through a Shower

2" WetVent

(4 F.U. max.)

1 14"

757R06B5

2"SANITARYTEE (TY)

SHOWER

1 12"Continuous

Vent

1 1/2"

Wet Vent Sizing (Table 7.5.8.1.)

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

18

f) the total hydraulic load on the wet vent does not exceed the limits stated in Table 7.5.8.1. when separately vented

branches or fixture drains in the same storey, having a total hydraulic load not greater than 2 fixture units, are connected to the wet vent or a wet vented water closet trap arm.

Continuous vent

Bath tub

kitchen sink

branchbathroom group7.5 fixture units

3” inch pipe

Tank W.C.

Lav

Wet Vent4 fixture units3” inch pipe

Continuous waste

and vent

Wet VentedBranch separately vented

fixture drain

fixture drain1.5 fixture units1 1/2” inch pipe

Note: the load from the separately vented kitchen sink is included when sizing this pipe

7.5.2.1. Wet Venting

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

19

Note: the load from the separately vented kitchen sink is included when sizing this pipe

Continuous vent

1 ½”shower

branch10.5 F.U.

3” inch pipe

Tank W.C.

Lav

Wet Vent6.5 F.U.

3” inch pipe

Continuous waste and

vent

Wet Vent

separately ventedfixture drain

fixture drain1.5 F.U.

1 ½” pipeKitchenSinkBath

tub

7.5.2.1. Wet Ventingf) the total hydraulic load on the wet vent

does not exceed the limits stated in Table 7.5.8.1. when separately vented branches or fixture drains in the same storey, having a total hydraulic load not greater than 2 fixture units, are connected to the wet vent or a wet vented water closet trap arm.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

20

Continuous Vent7.6 metres

Bathtub

kitchen sink

branchbathroom group7.5 fixture units

3” inch pipe

Tank W.C.

Lav

Wet Vent(fixture drain)

Continuous waste

and vent

Wet Vent(branch)

separately ventedfixture drain

fixture drain1.5 fixture units

1 1/2” inch pipe

(g) the hydraulic load to be considered when sizing a continuous vent, that serves a wet vent only includes the hydraulic load that is wet vented,

7.5.2.1. Wet Venting

3” inch pipe4 fixture units

1 1/2” inch pipe6 fixture units

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

21 (i)

kitchen sink

Wet Vent

Lav

Lav

Lav

kitchen sink

kitchen sink

TankW.C.

TankW.C.

symmetricalconnection

Fixture Units = 7.5Size = 3” pipe

Note: Any fixture above the symmetrically connected water closets must be included in sizing the wet vent.

Stack VentFixture Units = 15.5Length = 8 metresStack Base = 3” PipeSize = 1 ½” Pipe

(h) when a wet ventextends through more than one storey, the total discharge from any one storey abovethe first storey does not exceed 4 fixture units,

7.5.2.1. Wet Venting

(Waste Stack)

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

21 (ii)

kitchen sink

Wet Vent

Lav

Lav

Lav

kitchen sink

kitchen sink

TankW.C.

TankW.C.

symmetricalconnection

Fixture Units = 7.5Size = 3” pipe

Note: Any fixture above the symmetrically connected water closets must be included in sizing the wet vent.

Stack VentFixture Units = 15.5Length = 8 metresStack Base = 3” PipeSize = 1 ½” Pipe

(h) when a wet ventextends through more than one storey, the total discharge from any one storey abovethe first storey does not exceed 4 fixture units,

7.5.2.1. Wet Venting

(Waste Stack)

Table 7.5.8.4.Size and Developed Length of Stack Vents and Vent Stacks

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

22

Stack Vent

Lav

bathtubkitchen sink

Tank W.C.

drinkingfountain

nominally horizontal

offset

Wet Vent

Note:the definition of “Offset” means the piping that connects the ends of two pipes that are parallel

(i) there is not more than one nominally horizontal offset in the wet vent, and, ………………….

7.5.2.1. Wet Venting

(waste stack)

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

23

Stack Vent

kitchen sink

Lavnominally horizontal

offset(maximum length

1.2 metres for 2” inchor less pipe)

Wet Vent(waste stack)1 Fixture Units

1 ½” Pipebranch2.5 fixture units1 1/2” inch pipe

(i) there is not more than one nominally horizontal offset in the wet vent, and, ………………….

7.5.2.1. Wet Venting

(i.) the offset does not exceed 1 200 mm for pipes 2 in. or less in size, OR

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

24

Stack Vent

kitchen sink

Lav

Nominally Horizontal

Offset(maximum length

2.5 metres for pipelarger than 2” inch)

Wet Vent(waste stack)6 fixture units3” inch pipe

Branch9 fixture units3” inch pipe

Lav

kitchen sink

Lav

Lav

Lav

Lav

(i) there is not more than one nominally horizontal offset in the wet vent, and, ……………….

7.5.2.1. Wet Venting

(ii.) the offset does not exceed 2 500 mm for pipes larger than 2 in. in size,

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

25

Continuous vent

Tank W.C.

Lav

Bath tub

NotRestricted

(j) the wet vented portion is not reduced in sizeexcept for the portion that is upstream of floor drains in accordance with Sentence 7.5.1.1.(3),

7.5.2.1. Wet Venting

(k) the length of the wet ventis not limited.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

StackVent

Note:To size the Stack Ventuse Table 7.5.8.4.

7.5.8.4.(4) A stack vent serving a wet

vent stack that is over 4 storeyshigh shall extend the full size ofthe wet vent to open air.

StackVent

Same size

WetVent

as Wet Vent

over 4 storeys

high

But, ………..7.5.4.2.(2) A soil or waste stack that

serves as a wet vent does notrequire a vent stack.

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

7.5.8.4. Stack Vents or Vent Stacks (serving Wet Vents)

26

1 ¼”1 ¼”

1 ¼”

1 ½”

(e)

Wet Venting – Correct or Incorrect

Rainier Bratsch-Blundel / Bryan Heyl – George Brown College – Ontario Plumbing Inspectors Association

1 ½”

3”

1 ¼”

1 ½”

2”

3”

1 ¼”

1 ½”

2”1 ½”

1 ¼”

1 ½”

(a)

3”

1 ¼”

1 ½”

1 ½”

2”

2” C/O

(b)

(c)

(d)

3”

1 ¼”

1 ½”

2”1 ½”

1 ½”

1 ½”

2”

27

Wet Venting

QUESTIONS? www.opia.info/members/

rblundel@georgebrown.ca

Code and Guide for Plumbing2006 Professional Edition

available at www.orderline.com

OPIA Education and Training 28

Wet VentingIncorporating Stack Venting and

NPC Harmonization

ONTARIO PLUMBING INSPECTORS ASSOCIATION INC.In the public service since 1920

OPIA Education and Training

Presented by:Rainier Bratsch-Blundel, CPSIPlumbing Professor – George Brown College