PRIMING THE SUBSTRATE

Manufacturers may recommend priming the concrete or plywood subfloor to help seal it and reduce the chance for air vapor emitted from the substrate to form bubbles in the underlayment. Be sure to check the technical guidelines on primer recommendations, since some manufacturers require a different primer over wood than concrete.

If you're applying the underlayment to a wood subfloor in an area susceptible to moisture exposure, such as food prep facilities, its a good idea to apply a flexible waterproofing membrane over the plywood to provide additional protection. A variety of waterproofing systems are available. I have had good success using one that consists of a mixture of pure acrylic and cement mixed at a one-to-one ratio. After mixing, I trowel the material onto the substrate and embed a fabric mesh in it.

Priming the Substrate Ardex Engineered Cements Priming the Substrate Ardex Engineered Cements

When installed properly, an underlayment will correct unevenness and minor imperfections in concrete substrates to ensure a smooth base surface for tile, carpet, vinyl, andother floor coverings. Ardex Engineered Cements

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