060201abB Drainage And venting systems :Part B

Question 1

Minimum fixtures required for installation in a single-family dwelling 

Answer 1

Kitchen sink, water closet, lavatory, bathtub/ shower , laundry standpipe, floor drain

Question 2

Requirements for laundry standpipe

Answer 2

Must be a minimum 24” above trap weir

Question 3

Max distance for 1 1/4” trap

Answer 3

5ft

Question 4

Max distance for 1 1/2” trap

Answer 4

6ft

Question 5

Max distance for 2” trap

Answer 5

8 ft

Question 6

Max distance for 3” trap

Answer 6

12ft

Question 7

Max distance for 4” trap

Answer 7

32ft

Question 8

When does a wet vent start and end

Answer 8

Starts from the trap arm connection from the most upstream fixture to the last fixture connection on the vertical pipe with the water closet being the most downstream connection

Question 9

Max water closets on a wet vent

Answer 9

Two

Question 10

Required flashing size

Answer 10

20x20” minimum

Question 11

What’s the amount of contact a flashing needs to make

Answer 11

4” minimum

Question 12

What’s the minimum requirements for a Type A (flat) roof flashing

Answer 12

Minimum height 6” above roof

Question 13

Water closet maximum trap arm

Answer 13

1 metre vertically and 3 metres horizontally

Question 14

Can dis similiar fixtures be dual vented

Answer 14

Yes

Question 15

When does a flat vent be sized as a stack vent rather than a individual vent

Answer 15

If the drainage piping serving the above fixtures passes through more than one story

Question 16

What table is used for wet vent sizing

Answer 16

2.5.8.1

Question 17

What’s the max number of wet vented water closets

Answer 17

Two

Question 18

All trap arms and fixture drains connected to the wet vent do not exceed what size

Answer 18

2”

Question 19

Where a wet vent extends through more than one storey the total discharge from any one storey above the first storey does not exceed how many fixture units

Answer 19

4

Question 20

A soil or waste pipe can serve as a wet vent provided there is not more than one nominally horizontal offset in the wet vent and does not exceed what distance

Answer 20

1.2m or 4 ft for 2”
2.5m or 8 ft for above 2”

Question 21

What fixture units are not considered when sizing a wet vent

Answer 21

The most downstream fixture as it’s not draining through the wet vent portion

Question 22

T OR F- there is no limit to the maximum length of a wet vent, the concern is the maximum distance from the trap to the vent

Answer 22

True

Question 23

What table takes precedence over all other venting tables

Answer 23

Table 2.5.7.1

Question 24

In cases of vent stacks exiting the roof where there is occupancy how far must the vent be

Answer 24

3.5

Question 25

Vent pipes can’t terminate out of the roof any shorter than

Answer 25

6”