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UNDERLAYMENTS

Excerpts from Bob Harris Guide to Concrete Overlays & Toppings

Underlayments, unlike their overlay cousins, do not get a chance to see the light. Their main purpose is as a thin topping to level, smooth, or fix imperfections in concrete substrates prior to installation of other floor coverings, such as tile, carpet, or vinyl.

Despite their undercover status, underlayments require the same care in installation as a self-leveling overlay (see Chapter 15 for details in Bob Harris' Guide to Concrete Overlays & Toppings). Inadequate concrete surface preparation and priming might lead to severe pinholing or bubbling that could actually show through on some vinyl tile floors.

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