Did you overlook the hole in the floor?

Just the other day we received an email asking about the huge hole in the floor associated with the bath tub.  Basically the question was whether or not they should do something about that hole.

Let’s take another look at the bath-tub:

  • When a bathroom is being built it is simply a relatively small room that will then have “unique” fixtures installed
  • All of the bathroom fixtures involve water in one way or another, either fresh water coming in or sewage / effluent going out.
  • Most of the bathroom fixtures are simple and easy to install, it is a matter of drilling the proper size hole in the floor allowing either pipes to enter or sewage pipes to leave.
  • Virtually all these holes are made for a snug fit; a 5/8” hole might be drilled for a half inch pipe.

Problems occur in the bathroom when installing the tub.  Take a look at today’s photograph and you will see that there is a relatively large hole that has been cut creating enough room for the tub’s trap that will extend beyond the floor.  This trap is necessary to prevent sewer gas from entering the home.

That large hole automatically becomes a huge source of Cold Air Penetration from the basement up into the house.  Go back and read our previous blogs about Cold Air Penetration and how important it is that you cut back on it as much as possible.

Leaving that huge hole in the plywood deck of the home is not a good thing to do; it needs to be sealed off and the cold air penetration stopped.

Solution – the easiest and least expensive way to solve this problem is to buy a piece of rigid foam, cut it to size with a kitchen knife, and then “glue” it in place with caulk.  When you think you are done take a good look for cracks and fill those cracks with caulk.  This entire project will make a huge difference and not cost much. 

Remember, our goal is to make a big difference and have the solutions be cheap.  This is a great example of how to do both.  Good luck and let us know how it worked out.

Share this post