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Question- I have a slab on grade with a hole left out for the tub trap. Question is what to do with this depression hole after all plumbing is connected? Insulate it or just insulate the wall cavity?
 

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Concrete it shut to prevent RADON incursion. Usually a 1 inch layer will work. Fill it up with sand to you only have an inch.


It also stops the nova scotia tunnel rat...
 
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