In last month’s issue, we spoke to manufacturers about how to properly use patches, primers and self-levelers in a wide range of situations. In our second look at underlayments, we cover backerboards and crack isolation membranes, as well as flooring underlayments for hard surface products including laminate, resilient and hardwood – finding out the best way to use them and any tips to help the installation go more smoothly.
Backerboards. Steve Taylor, Custom Building Products director of technical and architectural marketing, said when a backerboard is used to prepare a floor it is important to have a bedding mortar beneath it. “Many times we find the backerboard is just placed over a wood substrate and screwed down. This creates a void between the backerboard and the wood substrate. Before installing the backerboard, a troweled layer of cement mortar should be spread over the substrate.”