Thanks to all of you for your replies. It sounds like the way he is going to do it probably meets code sine there's ambiguity in the code. I think I'm going to ask him to do a sloped mortar/cement bed under the hot mop since using stacked asphalt shingles doesn't seem like it would be solid...
I'm a little concerned with the approach my contactor is using to prep to hot mop a shower pan floor (yes I'm in SoCal). I'm hoping some knows if his way is considered acceptable and is to code.
His plan to prep for hot mop (floor is concrete slab / shower size is 3' x 5' :
- lay down a couple...
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