how to seal concrete floor from moisture
Most manufacturers of high-solids sealers require a well-defined profile before application of their products. General-purpose, 100% acrylic, interior and exterior floor primer. Sealing the concrete can help eliminate the dampness on your floor. Is it perhaps because the original sealer was a polyurethane that the others sealers are not bonding to, and with washing and water exposure, they are coming off? Based outside Atlanta, Ga., Shala Munroe has been writing and copy editing since 1995. This method requires you taping a 16-inch square piece of clear plastic, at least 6 mils thick to the floor. Answer: Sanding will take surface bubbles out, but buffing with a floor machine will not be aggressive enough. Even with the high air temperature, the humidity was not taken into consideration. Why did the two-part polyurethane peel off, while the one-part solvent-based acrylic is still down and performing great? • You will often see efflorescence (white minerals) or mold growth on damp concrete. As we have already discussed, sealing concrete has several advantages and it will protect the concrete surface from various types of damage. Pay special attention to the corners and edges of the floor, where cracks can let extra moisture seep in. Concrete is a sponge, and if conditions are right it will absorb and hold moisture, both in liquid and gas forms. Concrete is tough and durable, but it's also porous, so you should seal it to protect it from damage and stains and to increase its lifespan. Time: 01:30 A water based, penetrating concrete sealer, Bone Dry Pro formula penetrates through the concrete surface, fills the capillaries in the slab and produces a barrier within the concrete. It's best to paint small areas at a time to ensure complete coverage with a thin layer of sealer; too much sealer can lead to bubbles as it dries. Avoid moisture by using a dehumidifier in the basement. This film is the protective barrier and reflects light to produce the level of gloss you want. V-SEAL 101 contains additives that help it soak into more dense substrates such as concrete floors, brick, stone, and stucco. The essential tool for hobbyists. A concrete floor sealer will beautify and preserve your floor. But now roller marks are visible throughout the entire floor, not to mention the bubbles. When the moisture readings drop low enough for you to seal the concrete (at or below 4 pounds), apply the sealer in the afternoon or evening, when humidity is lowest. A smooth finish has fewer of them while a rough finish looks like the Grand Canyon. This is especially true for nonbreathable coatings, like the polyurethane you plan to use. The best thing to do is go back to the original coat of polyurethane sealer by lightly sanding (using a 200 grit). The practice of closing doors and windows to "dry-in" a room or building can actually trap moisture and create a steam room of sorts, making the problem worse or creating a problem where one didn't exist. Clean and dry your floor before sealing it. What is probably happening is diffusion. This is why a vapor barrier under concrete is essential. Typically when we see a floor that has blotchy areas of gloss, this means that some areas do not have sufficient sealer to fill the valleys. Also, should I apply the primer using a sprayer instead of a roller, and should I mix smaller amounts of the sealer? As illustrated by the case in question, an acrylic sealer may chemically bond to a hard-troweled surface, but the surface won't have sufficient profile, or roughness, to mechanically bond with a high-solids polyurethane sealer. The cause is different levels of porosity in the concrete surface. For applications where a high shine is not desirable, you can also find film-forming sealers with matte or low-gloss finishes. Titebond offers the right mix of products and technical advice to help homeowners, hobbyists and DIYers of all skill levels achieve the best results possible. Now you have multiple layers of different sealers, all of which seem to be wearing. There are many different types of concrete sealers. There are two main sealer categories: topical sealers (coatings) and penetrating sealers (reactive). This can cause issues with mold and mildew, especially if you have carpet or furniture on top of the concrete. Depending on floor traffic, residential coatings can last 30 years, while in industrial settings it could last 2-3 years. Vacuum or sweep it thoroughly, then scrub it with a mop. After 24 hours, check the plastic to see if water has condensed underneath it. Sealing Your New Concrete Floors The lighter areas may be a sign of higher than desire moisture causing the color pigment to dilute. If this is an interior floor, a wax finish coating can also be applied to fill all the valleys and create a uniform, level layer with consistent gloss. Using a concrete sealer to seal old or new concrete is a good idea and the process of curing the concrete and sealing it will not only help to protect the concrete but also help to enhance its appearance. Learn more about the types of concrete sealer. That being said, you have a slab that should eventually drop below 4 pounds because of the vapor barrier. Here's a list of common questions about concrete sealers and how they work to protect your floor. All rollers produce lines, with more material coming off the ends of the roller as it moves across the surface. Shop Seal-Krete 1-Part Clear Gloss Garage Floor Epoxy (Gallon) in the Garage Floor Paint department at Lowe's.com. Answer: I think you are on the right track in terms of the other sealers not bonding to the original polyurethane sealer. If you use a penetrating concrete sealer then the product will penetrate deep into the material to form a protective barrier. Solvent-based concrete sealers are extremely flammable and the toxic fumes they emit can be hazardous to breathe. Seals concrete against water seepage, water vapor. These finish coatings are low cost, go down very thinly and are easy to maintain. If you have a concrete floor that’s in continuous contact with a source of moisture, you’re going to have problems. The life expectancy of a sealer depends, in part, on exposure conditions and how well the floor is maintained. Drywall mud, paint and rainy or hot, humid weather can cause high moisture contents indoors, which will cause concrete to absorb moisture. Protects from water, staining, and abrasion. Learn more about checking the VOC content. Depending on the type of water-based sealer you used, a thin application of solvent might loosen the sealer enough to allow the moisture to escape. Original Waterproofing Sealer protects vertical Seal-Krete 5 Gal. Continue drying the floor until your dampness test with the plastic square stays dry overnight. Most two-part polyurethane sealers are high in solids, above 55%. Whether the humidity is manmade or natural, it can cause short-term high moisture readings, especially in the spring and fall, when days are warm and nights are cool. Do a test area before doing the entire floor. Here is my question: Because of the high moisture readings, should I do this job? The bleach has the added benefit of helping to kill mold and mildew that might have accumulated on the floor. This floor is on grade, and the concrete is over two months old with a vapor barrier under the slab. Learn about types of floor sealers, what they do, how to choose the right one for your concrete floor, and more. If the smell persists after cleaning, you may need to seal the floor with a concrete sealer. Cost to Seal a Concrete Floor . Otherwise, you will need to strip the sealer, clean the surface and allow it to fully dry, and then reseal. This moisture will stay in the concrete until the moisture content of the air above the slab abates. Can Water-Based Floor Polyurethane Be Used Over Paint? In general, epoxies and urethanes deliver the best long-term performance and can last years before the need for reapplication. Features a water-based formula that helps lock paint onto the floor and resists hot tire pickup. View this comparison chart of concrete sealers. The higher solids content makes them less able to penetrate the concrete surface, thus requiring additional surface profiling to promote adhesion. Learn more about the types of concrete sealer. This is a large 8,000-square-foot floor in the cafeteria of a local manufacturer, and it receives heavy traffic. 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