DanFL
Member
DIYer in need of some help with the proper way to add to the DWV system in my basement. The attachment shows a picture of the bathroom in question with an isometric drawing of the layout. I have an existing drain and vent that I need to tie into (existing in blue, new in green in the drawing). I'm adding a sink in the bathroom and would like to add a laundry sink and stackable washer/dryer in the adjacent utility room. Here's what I think I know so far:
1. DFU Values:
bathtub/shower = 2.0
single lavatory = 1.0
toilet = 3.0
laundry sink = 2.0
washer = 3.0
total = 11.0
Am I exceding the max unit loading for the 1-1/2" vent? If so, I could leave out the washer hook up.
2. Is there any way to combine any of the trap arms A, B, and/or C?
3. I'm assuming the correct fitting at A, B, C is a san tee.
3. Do they all need their own vent that ties back into the main vent as shown in my diagram?
4. I'm pretty sure the washer needs a cleanout between H and E. If so would I tie this into the existing main vent to roof as shown? Proper fitting at H would be a combo Y - 1/8 bend and not a san tee, correct?
5. Washer 2" P-trap is min 6", max 18" above floor, with 2†standpipe min 18â€, max 30†above P-trap.
6. Trap arm B is at the allowable max of 3'-6" to drain (or is this the requirement to the vent?)
If it would make this easier, I would consider swapping the location of the washer and laundry sink in the utility room. I'm thinking this might allow me to combine the lav in the bathroom and the laundry sink on the same trap arm.
1. DFU Values:
bathtub/shower = 2.0
single lavatory = 1.0
toilet = 3.0
laundry sink = 2.0
washer = 3.0
total = 11.0
Am I exceding the max unit loading for the 1-1/2" vent? If so, I could leave out the washer hook up.
2. Is there any way to combine any of the trap arms A, B, and/or C?
3. I'm assuming the correct fitting at A, B, C is a san tee.
3. Do they all need their own vent that ties back into the main vent as shown in my diagram?
4. I'm pretty sure the washer needs a cleanout between H and E. If so would I tie this into the existing main vent to roof as shown? Proper fitting at H would be a combo Y - 1/8 bend and not a san tee, correct?
5. Washer 2" P-trap is min 6", max 18" above floor, with 2†standpipe min 18â€, max 30†above P-trap.
6. Trap arm B is at the allowable max of 3'-6" to drain (or is this the requirement to the vent?)
If it would make this easier, I would consider swapping the location of the washer and laundry sink in the utility room. I'm thinking this might allow me to combine the lav in the bathroom and the laundry sink on the same trap arm.