ASTM F2170
in-situ RH test for concrete slabs
Slab Readings Before We Order Adhesive
A glue-down floor is only as good as the bond between adhesive and concrete, and moisture moving up through a slab can break that bond down over time. We test the slab the way your flooring and adhesive makers require, often with ASTM F2170 relative humidity probes set in drilled holes, and compare the numbers to their published limits. If readings run high, you hear about it before install, along with the price of the moisture-control option.
2 mm
wear layer that can usually be sanded once
Wear Layer Explained Before You Buy
Two planks can look identical on a showroom wall and have very different futures. A veneer under 1 mm can only be screened and recoated, while a wear layer of about 2 mm or more can usually take at least one full sanding. We point out the wear layer on every sample, explain what it means for a house you plan to keep for 5 years versus 20, and help you pick a thickness that fits that plan.
3/16 in.
common flatness limit over 10 ft
A Flat Slab Makes a Quiet Floor
Hollow spots under glue-down planks click when stepped on and can crack the adhesive, and dips under a floating floor make it bounce. Many engineered flooring makers, along with NWFA installation guidelines, call for glue-down and floating installs to be flat within about 3/16 inch over 10 feet. We check with a long straightedge, grind the humps, fill the dips and show you the prep as its own line on the quote.