concrete porch


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Old 05-22-07, 01:40 PM
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concrete porch

I have a small porch (4.5 ft. x 8.5 ft.) over which I want to lay another 4" of concrete to get the top of the porch closer to the bottom of the door. I live in Southeastern Pennsylvania and I'm afraid the concrete will crack in the winter cold. How do I do it correctly and is it okay to use ready mix cement?
 
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Old 05-22-07, 04:28 PM
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When pouring new concrete atop old, it's best to use a bond-breaker between the two slabs. I use roofer's felt paper. That way, any cracks in the existing concrete do not transfer up into the new slab. Also use rebar as reinforcement, and consider using fiber in the concrete as well.
When you say ready mix concrete, do you mean the bagged stuff you mix up yourself? Ready mix concrete is what they call the stuff that comes out on a cement mixer truck. The big advantage of ordering the concrete from a plant is that it can be air-entrained, which is a "must" in harsh climates like yours (to prevent scaling). Most bagged mixes, if not all of them, do not contain entrained air.

Pecos
 
 

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