Brendan Simons
New Member
I am building a second-floor laundry room. There will be a floor drain under the washing machine, and I'm looking for a solution to keeping water in the floor drain trap without being able to reach it easily for maintenance (and without a trap primer valve, which is proving to be hard to find around here).
My current thought is to connect the floor drain trap to the trap at the bottom of the laundry standpipe, as shown in the attached sketch. Basically I'll extend the laundry trap depth a bit and install a 1/2" tee below the waterline (but above the trap weir). From there, I'll run a 1/2" pex line down to the floor drain. The laundry trap should drain through the pex line into the floor drain trap until the water level is lower than the tee. I'm hoping that, since the pex line is only 1/2", it won't allow enough flow from the standpipe to flood the 2" floor drain. Can you point out any flaws in the design?
My current thought is to connect the floor drain trap to the trap at the bottom of the laundry standpipe, as shown in the attached sketch. Basically I'll extend the laundry trap depth a bit and install a 1/2" tee below the waterline (but above the trap weir). From there, I'll run a 1/2" pex line down to the floor drain. The laundry trap should drain through the pex line into the floor drain trap until the water level is lower than the tee. I'm hoping that, since the pex line is only 1/2", it won't allow enough flow from the standpipe to flood the 2" floor drain. Can you point out any flaws in the design?