Pouring concrete over concrete

Q. I am going to pour 2" of concrete over a 4" cracked slab of concrete behind my back door. If I put wire mesh down first will the concrete I pour crack with such a deep base already present?

A. If the crack in the bottom slab is still active, meaning the bottom slab still moves (expansion & contraction), it is highly likely the crack will mirror through the new 2" of concrete.

If the bottom slab is not moving, it shouldn't crack in the same spot, but possible it may crack somewhere else. If the slab is larger than 8' x 10', I would saw some contraction joints to help prevent it from cracking. If the slab is smaller than this you should be ok.

Join in and write your own page! It's easy to do. How? Simply click here to return to General Concrete Questions.

Facebook X

One more way to share everything-about-concrete.com

Would you prefer to share this page with others by linking to it?

Click on the HTML link code below.
Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable.

Hi, I am Mike Day, owner of Day’s Concrete Floors, Inc. in Maine. I've been working with concrete for 45 years now, and this website is where I can share with you all the knowledge, wisdom and expertise I've gained from installing all kinds of stamped concrete, concrete floors, concrete overlays, concrete slabs and also repairing & fixing cracked or spalled concrete.

There’s a lot to cover, so if you have any questions, contact me!

CHECK OUT OUR SPONSORS