So I have been busily preparing for my new tub. It's going on an enclosed porch that formally was open. It has a decent pitch to it, like 2 1/4" over 13' which I figured is too much out of level for the tub. From research, I understand that flat is more important than level.
The area I'm putting the tub on has been pretty much leveled using concrete and self leveling cement (within a quarter to half a bubble on either axis). The patio itself that I leveled, is 4" of concrete and a finish layer of tera cotta tile in a mosaic pattern, so plenty of weight bearing capacity.
Anyways, my base layer of quickcrete had some high spots that the self leveling concrete didn't cover. In total, I have one spot, about 3" in diameter that has aggregate sticking up about a 1/4 of an inch and several very small spots about the same height (like 2 or 3 stones).
The tub will have an ABS base and the worse high spot is not on the edge.
Is this good enough or do I need to break out the grinder to fix the high spots?
