Preventing Concrete Moisture Problems in Your Concrete Overlays

While concrete overlays offer a fabulous design solution, they commonly experience moisture problems. This occurs when water vapor emissions form between the underlying concrete slab and the impermeable layer that forms on top of the slab. When such vapor becomes trapped, it can cause a greater amount of pressure than the bond strength of the topping and slab, resulting in the delamination of the topping. A combination of white salt residue along with the pressure produced by moisture is enough to cause most overlays and coatings to lift or delaminate. Such concrete moisture problems will almost always develop when a concrete slab is lacking an under-slab vapor barrier. Even with vapor barriers, new slabs will need time to dry.

Concrete Moisture Treatment

Testing for the Presence of Concrete Moisture

There can be a number of reasons why concrete might experience moisture problems, including it had not fully cured, there is a high water table, or the concrete was produced with a high water-to-cement ratio. When concrete moisture problems are suspected, regardless of the cause, it is important to perform a test to be certain. One option is to perform a tape-down test in which a small area is taped down and sealed overnight. If beads of condensation or sweat appear the next day, you know there is excess moisture. When this is the case, it is vital to reduce the moisture content prior to applying a concrete overlay.

One of the best ways to prevent concrete moisture problems in overlays is to treat the base concrete with a non-breathable waterproof coating. The coating should have a crack-suppression membrane embedded inside it to act as a barrier and prevent moisture movement while providing a stable substrate on which to apply the microtopping for the overlay.

Duraamen Industrial and Polished Concrete Flooring Products are designed to provide labor saving and long lasting flooring solutions. Talk to an expert about your flooring challenges...Please Call + 973 230 1301 / eMail Us

You might also be interested in…

How decorative concrete floors contribute to LEED points?

A potential customer (whether a property owner or an architect) might ask how decorative concrete floor could possibly meet LEED requirements and be considered environmentally friendly. If that question arises, ...

Read more

Why mix ratios are important for Epoxy coatings?

We have come across many times where contractors made a mistake in mixing the two components of an epoxy or polyurethane coating. Some of the common problems that occur of ...

Read more

Choosing the right Concrete Flooring Products

You have to select the appropriate concrete flooring products for the best results. Some Duraamen products are designed for particular uses, and when used outside of their specifications, the results ...

Read more

Renovating Office Space In NYC

Renovating Office Space in NYC with Duraamen Floor Coatings Virtually every floor of every building in NYC has a floor with problems. Duraamen floor coatings have been engineered to provide solutions ...

Read more