Concrete Deck

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Posted by: from Roanoke
5/24/2018 at 6:45:24 PM

We have a concrete deck that sits about 6 ft. high from the ground. It has tar paper attached underneath on bottom. Would this not cause the concrete to break down from moisture?

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Date/Time5/24/2018 at 8:04:05 PM

Yes it's protected concrete from moisture it's call vapour

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Marco from Tor Contracting in Lisle
Date/Time5/24/2018 at 8:21:24 PM

The Tar Paper (normally plastic is used) helps keep the moisture in the concrete and prevents any extra moisture to absorb into the concrete. There is always moisture in concrete

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Date/Time5/24/2018 at 8:41:50 PM

With out knowing the year the concrete deck was built but tar paper was used to separate the concrete from forms. Often it was just left in place after the forms where removed. But in saying that, tar paper is Pouris and water vapour would evaporate away. Sometimes if the tar paper gets wet during a freeze and thaw cycle it can cause surface damage to the concrete where you will see the concrete surface starting to flake away.

At that point the tar paper should be completely removed.

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