If you don't want the wood beneath to show through, you'll have to roll on two or more thin coats of mud, letting the first coat dry completely before rolling on the second coat. Engineered flooring can be glued directly to concrete, but nail-down solid strip flooring must have an approved subfloor over the concrete. Manufacturers of overlay materials boast that a skim coat can be as thin as a credit card. Follow the flooring manufacturer's recommendations for acclimation of the wood flooring, if necessary. Glue-down underlayment: In this system, use 5/8-inch (minimum) or 3/4-inch (preferred) CDX-grade plywood, laid in mastic over the concrete or moisture barrier. The minimum acceptable wood subfloor material, according to NWFA guidelines, is 5/8-inch CDX-grade plywood. In any case, the moisture content of the wood subfloor should be within 4 percentage points of properly acclimated solid strip flooring (within 2 percentage points of solid plank flooring). The specification for flatness is defined as a height variation of no more than 3/16-inch in 10 feet. We recommend applying Param 5500 at a minimum … Follow the flooring manufacturer's recommendations for acclimation of the wood flooring, if necessary. Drywall mud is not intended for outdoor use, so don't skim-coat a garden shed. Prefinished wood floor filler. In some commercial applications, builders install plywood walls and then skim-coat the wood panels with drywall mud for a Southwestern stucco look or for hand-troweled Old World appeal. The surface needs to be clean, and it sticks better when the wood is damp. Finance available from per month, approval subject to status. Above grade slabs poured in metal pans take significantly longer to dry and have been known to require several months to well over a year to be safe for wood flooring installation. Wood filler is probably OK if it was applied correctly and sanded properly after application. Also, a moisture barrier is required anytime solid wood flooring is installed over concrete. Skim coating is the process of applying a layer of a thick compound to smooth out rough or damaged ceiling and walls. £0.00 £0.00. Prefinished wood floor filler is a product fairly new to the market. This film prevents the penetration of moisture through the slab to the interior surface, where it can ultimately damage hardwood floors. What Does ‘Baseline Moisture Content’ Mean? They can allow subfloors and concrete to be checked for high moisture levels; they can help determine when a second coat of water-based finish can be applied; they can aid in assessing water damage. In a new building, it must be at least 30 days old before you can consider moisture testing. As always, follow the recommendations of your wood flooring manufacturer. All tests should be done at several different locations in a room — typically along exterior walls and walls with plumbing enclosures, as well as over mechanical chases. Cover the whole area to be skimmed and let the mud overlap onto the surrounding surface. Akhurst Machinery ... Motors 101 & What Wood Flooring Pros Should Know, Part 1. The higher the moisture content, the lower the resistance. Apply floor coverings in as soon as 1 hour. Conduct a Moisture test before installation. Call us today to … The specification for dryness is a subfloor moisture content that measures within 4 percent of the properly acclimated wood flooring. The following companies offer unfinished options to meet that demand, with wood ... See some of the latest machines available for the manufacturing of wood flooring. Some manufacturers have introduced chemical systems designed to speed the curing process and also to seal the concrete to prevent excess moisture from migrating into the subfloor and finished wood flooring. The HENRY 547 is a floor leveler and patch skim coat and can go over wood floors, but it’s not a wear surface and a flooring material should be applied. Is the subfloor approved for wood-flooring application? Apply the mastic with a notched trowel. Checking the moisture content of the subfloor — again — and recording it on the work ticket. The first thing you have to know about any wood flooring installation is that if you want the installation to succeed, the subfloor beneath it must be clean, dry and flat. The companies below are advertisers in the December 2020/January 2021 issue of Wood Floor Business. Once that has been established, attention should turn to the subfloor. Ensuring that moisture conditions are met means the house must be roofed, walled and windowed, and the heating and air conditioning units should be operating. Calcium Chloride and 90% Relative Humidity without the … Can this product be used on an exterior slab? Preparing the subfloor for installation begins when the contractor first visits the jobsite prior to installation, paying particular attention to moisture conditions. General guidelines suggest that 60 days is sufficient for the curing to occur, and floors can be installed after this. In general, you will need to apply 2–4 coats before the surface is smooth. 0 packs (0 m 2) @ 0.00 /m 2. Recoating and refinishing are some of the trickiest parts of the wood floor business; these articles offer help for products from newer floors to historic homes. After about 30 minutes, during which the solvents flash or evaporate, the polyfilm can be rolled over the mastic by walking over the film, embedding it in the mastic. 1. Metal lath stapled over plywood substrate. Among the issues to be determined: These are all questions that need to be answered before you schedule installation. Start by Prepping the Walls. Apply from featheredge to 1" thick. Moisture meters have many purposes. Wood flooring can be installed over existing ceramic tile, marble or terrazzo with proper underlayment or adhesives (according to manufacturer’s recommendation).   As always, NWFA guidelines dictate that manufacturers' recommendations on subfloor preparation and installation take precedence. The mastic should be troweled with a straightedge trowel to skim coat the slab, with coverage of about 80-100 square feet per gallon. For more details on testing concrete for moisture, see "Concrete Evidence," June/July 1998, p. 81. Polyfilm — 6- or 8-mil polyethelene film in 36-inch or 48-inch-wide rolls — applied over a "skim" coat of asphalt mastic. These guidelines, however, are influenced by a number of variables, and should not be used as the sole criterion as to whether or not it is safe to install a floor. Because moisture can rise through concrete by capillary action, moisture-vapor barriers and moisture retarders need to be part of the installation process. Also, while NWFA guidelines specify widely accepted practices, the association dictates that manufacturers' recommendations on subfloor preparation take precedence over NWFA guidelines. According to NWFA Technical Publication No. Therefore, all slabs should be tested for moisture before the floor's installation. She also enjoys writing business and finance, food and drink and pet-related articles. In some commercial applications, builders install plywood walls and then skim-coat the wood panels with drywall mud for a Southwestern stucco look or for hand-troweled Old World appeal. 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