ldonhat
Oct 3, 2007, 09:38 AM
The old shower pan was placed directly upon the foundation. The old shower had a center drain and in the foundation there is a diamond shaped cutout for the drain trap to pass through (see image). The tub needs a bed to support its entire base which needs to be about four inches higher than the foundation. My question is, should I fill in the hole in the foundation where the drain trap is with the bedding material (mortar is recommended) or does the hole need to stay there for the drain trap?