garage floor

Old 09-11-05, 07:22 PM
New Member
Thread Starter
Join Date: Mar 2003
Location: PA
Posts: 403
Upvotes: 0
Received 0 Upvotes on 0 Posts
garage floor

I'm in the process of preparing a garage floor for concrete. It is 18 by 24(ft).
I have a few questions.
1) is 2 inches of gravel and 4 inches of concrete enough?
2) do I need to tamp the gravel?
3) can I pour this as one pad, or do I need expansion joints?
4) should I use the fiberglass reinforced concrete?

Any other suggestions would be appreciated?

Old 09-11-05, 09:01 PM
Join Date: Mar 2005
Location: USA
Posts: 5,650
Received 1 Upvote on 1 Post
garage floor

1. Should use 6" gravel, a poly vapor barrier then the 4" concrete. If this is a slab that could freeze, it would be good to use air entrained concrete. The salt and moisture from cars can do a job on non-entrained concrete.

2.Definitely compact the gravel.

3.You should have control joints to control the cracks. It is best to saw cut joints a day or two after pouring. Wait a couple of weeks and caulk the saw cuts with a silicone caulk. A 24 x 18 slab should be cut into two 12 x 18 sections. You can use a tooled joint. The joint is not an expansion joint - it is used to control the location of the crack that will occur somewhere due to the shrinkage of concrete as it cures.

4. Fiber mesh is good to keep the size of cracks to a minimum rather than than have larger cracks. Most people use 6" wire mesh also.

If you pour it yourself, make sure you have plenty of friends on hand.


Thread Tools
Search this Thread
Ask a Question
Question Title: