Underlayments, like most subfloor preparation products, are the invisible and often unsung essentials of any professional flooring installation. These crucial products ensure the subfloor is primed and ready to accept further materials – whether that be a crack isolation membrane, a backerboard, flooring underlayment or the flooring itself. In part one of our two-part look at underlayments, we talk with manufacturers about the various patches, primers and self-leveling underlayments, and when to use them.
Patches and Primers. Craig Morris, Ardex technical service manager, said it is important to patch or skim coat a concrete slab prior to flooring installation. “With bonded installations, failure to patch and skim will result in the telegraphing of any defects in the concrete to the floor covering. In unbonded installations, it can bring previously out-of-tolerance concrete into tolerance.”