SL-150™, SL-175™, and SL-200™, are a very easy and effective way to achieve a flat subfloor. Self-leveling underlayments, such as Bostik’s SL-100™, Subfloors must be flat per NWFA standards to within 3/16 inch in 10 feet, and excessive roughness of the surface can influence the coverage rate. Nothing is more important than proper subfloor prep. One of the most significant causes of voids in all-in-one membranes is the condition of the subfloor. As a result, coverage rates must never be stretched. Voids in the membrane could allow significant amounts of moisture through from the subfloor to the hardwood and result in failures. The ability of all-in-one adhesive and moisture vapor membranes to achieve this exceptional level of performance requires that they form a continuous membrane to be effective. There are no flooring type limitations on GreenForce® or Ultra-Set® SingleStep2™, and there are no board width or length restrictions on any Bostik adhesive. Vapor-Lock™ offers a higher level of protection, so it offers unlimited moisture vapor protection for engineered and solid hardwood, but it does have a 15 lb moisture vapor emission rate or 87% RH limit on bamboo, which as a category is least dimensionally stable. For example, Bostik’s BEST® offers unlimited moisture vapor protection to engineered hardwood, which is more dimensionally stable than solid hardwood. Understanding the requirements of the specific products is the key to getting the advanced performance desired. Vapor-Lock™ and Ultra-Set® SingleStep2™ go even further in offering sound abatement equivalent to ¼” cork or rubber underlayments. Understanding these new products and systems is critical to avoid installation issues, make customers happy, and extract the value for the contractor.Īll-in-one adhesives like Bostik’s BEST®, Vapor-Lock™, GreenForce®, and Ultra-Set® SingleStep2™ are amazing, time-saving installation systems that offer a lifetime warranty for unlimited moisture vapor protection with no concrete moisture testing required – the concrete simply must be dry to the touch. With this degree of change comes uncertainty. New adhesive technologies, such as Bostik’s AXIOS® Tri-Linking technology found in GreenForce® and Ultra-Set® SingleStep2™ are raising the bar in performance, not only in moisture protection, sound abatement, and zero VOC’s, but also workability, ease of clean even after cure, and ridge retention (to prevent hollow spots). Zero VOC formulations are in nearly every major adhesive manufacturer’s portfolio. All-in-one adhesives with moisture vapor and sound reduction properties are now common. Installation systems have evolved as well. The flooring itself has trended toward wider plank, engineered is now more common than solid, prefinished flooring has grown in popularity as well as capability, click and floating floors are on the rise, and there are more and more types of flooring emulating the look of real hardwood. The hardwood industry has changed quickly over the last decade. By Eric Kurtz, LEED® Green Associate, Bostik’s Market Manager for Hardwood Installation Systems
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