I have an old garage (28'x24') that had a concrete floor, which sank
due to the fill that was used under that concrete floor, I think. I
removed the old concrete and about 12" of loose dirt mixed with
gravel. My questions are: What type of fill should I use. Should I
rent a tamper and tamp that fill? There is a limestone quarry not far
First, if any of the existing fill look soft or otherwise unsuitable, that
fill should also be removed. As a subgrade for a concrete garage floor, I'd
go with crushed stone. Note that this is NOT the same thing as gravel.
(Gravel is typically river stone with rounded edges and is not a great
structural material.) The crushed stone should be pieces about 3/4" to
1-1/2" in size. Some compaction will be possible, but it should be fairly
stable right out of the truck.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.