Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

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?

Do you have the same question? Follow this Question

1 Answer


Illustration attached

Answered 5 years ago by Guest_91634811

Related Questions

Terms Of Use
Privacy Policy