060201abB Drainage And venting systems :Part B Flashcards
Minimum fixtures required for installation in a single-family dwelling 
Kitchen sink, water closet, lavatory, bathtub/ shower , laundry standpipe, floor drain
Requirements for laundry standpipe
Must be a minimum 24” above trap weir
Max distance for 1 1/4” trap
5ft
Max distance for 1 1/2” trap
6ft
Max distance for 2” trap
8 ft
Max distance for 3” trap
12ft
Max distance for 4” trap
32ft
When does a wet vent start and end
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
Max water closets on a wet vent
Two
Required flashing size
20x20” minimum
What’s the amount of contact a flashing needs to make
4” minimum
What’s the minimum requirements for a Type A (flat) roof flashing
Minimum height 6” above roof
Water closet maximum trap arm
1 metre vertically and 3 metres horizontally
Can dis similiar fixtures be dual vented
Yes
When does a flat vent be sized as a stack vent rather than a individual vent
If the drainage piping serving the above fixtures passes through more than one story
What table is used for wet vent sizing
2.5.8.1
What’s the max number of wet vented water closets
Two
All trap arms and fixture drains connected to the wet vent do not exceed what size
2”
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
4
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
1.2m or 4 ft for 2”
2.5m or 8 ft for above 2”
What fixture units are not considered when sizing a wet vent
The most downstream fixture as it’s not draining through the wet vent portion
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
True
What table takes precedence over all other venting tables
Table 2.5.7.1
In cases of vent stacks exiting the roof where there is occupancy how far must the vent be
3.5
Vent pipes can’t terminate out of the roof any shorter than
6”
