Guest
Oops…Almost forgot!
Take a measuring tape to the pipe coming up thru the floor- It should be either 3″ or 4″ in diameter (76mm or 102mm for you brits & aussies) , not counting the outside wall of the pipe- any less than that & you are “hosed”. It is now time to make your contractor chip up the basement floor & replace with the proper size pipe.
good luck
