Basement rough plumb - what's this?
- Thread starter Prashster
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hj
Master Plumber
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thing
It is the "blockout" box for the tub or shower "P" trap.
It is the "blockout" box for the tub or shower "P" trap.
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Jimbo
Plumber
At the slab-pour stage, you have no way to accurately detemine the exact final placement of the trap....your rough sill plates and walls are not even set at that time. The final location of the trap can be set inside this box once your rough framing is up.
V1rtu0s1ty
DIY Senior Member
Thanks phrashter for posting the pic here. Am now a member of terrylove too. 
By the way, I'm a visual type of person. What is a P trap?
By the way, I'm a visual type of person. What is a P trap?
V1rtu0s1ty
DIY Senior Member
I did a google image search and saw those P-traps
From what I'm currently seeing in my basement, I have to make a big square cut on that black plastic. Am I correct?
From what I'm currently seeing in my basement, I have to make a big square cut on that black plastic. Am I correct?
hj
Master Plumber
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thing
First you have to understand that most of the lower portion of a tub drain is below the floor so that big box gives you room for it. It also may give you room to cut the trap off and repipe a new trap if it has to move to a different, nearby, location to line up with the bathtub.
First you have to understand that most of the lower portion of a tub drain is below the floor so that big box gives you room for it. It also may give you room to cut the trap off and repipe a new trap if it has to move to a different, nearby, location to line up with the bathtub.
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