I recently purchased a handyman special for rehabbing. The foundation is slab on grade. While I was deconstructing the bath room, I discovered the 1-1/4″ tub drain is just sitting inside a 4″ pipe. There is a piece of plastic sheet cut to fit around the tub drain and sitting on top of the 4″ pipe in the slab. It is definitely not a gas or water tight connection as I can lift up the plastic piece in see inside the 4″ pipe. Does anyone know how this connection should be made typically? I don’t have an issue with busting out the concrete to correct this error. Seems to me you would get sewer gas or water backing up in the house. There may be a trap in the slab below grade but I have not removed the tub yet which is next on the list. Thanks.
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The tub connection is the same as it would be if the tub were situated in a wood frame building with a 2" glued trap buried below grade. How well you seal the plumbing at the slab level depends on a variety of things such as the presence of radon gas, high water table, termites etc. In the absence of any of these, foam will do.
there usually a block out around the drain, maybe a foot by foot, you tie in trough a hole in the other wall or before drywall, then once the tub is set you fill the hole with wet cement and around the base of the tub, as in bedding the tub. the pipe in the blockout is usually a 2 inch p trap.