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Question DetailsAsked on 4/1/2015

Can you fill the gap in a floating slab basement?

My 1940s basement has a rather wide ( 2" wide by 3" deep) gap around the perimeter of the cement floor. It is a floating slab basement, designed to apparently allow seasonal movement of the slab and some (lame) pathways for moisture to flow to the sump pit (not really pitched well to promote water travel).

Mostly the walls of the gap are smooth cement, but in some small areas the slab and bottom of the gap show some evidence of cracking or erosion. Basement is mostly dry, and Radon mitigated.

I would like to potentially fill the gap (at least partially) with cement or a self leveling cement to:

a. reduce the chance of radon leaking in through cracks
b. reduce depth and opportunity for debris to collect in gap
c. eliminate opportunities for moisture to leak in around the walls

My question: will I compromise the floating stab design by filling in the gap and thus make my slab prone to cracks from seasonal shifting?

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Illustration attached

Answered 5 years ago by Guest_91634811




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