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I-Hate-Hulse · 12-07-2007, 06:08 PM

So the renos are continuing to the basement bedroom / bathroom. The plumber came in and had to bust up concrete floors to get at the trap / flange / vents, so there's 4-6" holes (4" deep) holes around the PVC pipes coming up from the floor. I'll be laying a 2x4 + 1/2" plywood subfloor over top of the concrete.

My question is: do I have to fill in the holes surrounding the pipes/trap with concrete? Especially since I have the 2x4 grid on top of it that will structure the subfloor nicely? Will they be prone to leak more or something?

I'd rather not mix concrete if I don't have to...

12-07-2007, 06:08 PM	#1
I-Hate-Hulse Franchise Player Join Date: Jul 2003 Location: Sector 7-G Exp:	Plumbing / Concrete Expert Question So the renos are continuing to the basement bedroom / bathroom. The plumber came in and had to bust up concrete floors to get at the trap / flange / vents, so there's 4-6" holes (4" deep) holes around the PVC pipes coming up from the floor. I'll be laying a 2x4 + 1/2" plywood subfloor over top of the concrete. My question is: do I have to fill in the holes surrounding the pipes/trap with concrete? Especially since I have the 2x4 grid on top of it that will structure the subfloor nicely? Will they be prone to leak more or something? I'd rather not mix concrete if I don't have to...