Back Concrete Coatings Back Interior Products Back ... High-solids, single component, aliphatic, moisture-cure urethane, VOC-complying, moisture resistant industrial floor coating. After letting the floor dry in 95 F heat for 2 ½ hours, I applied the sealer as directed. Get your floor as dry as possible before sealing it. Time: 01:49 Cornerstone Concrete Designs in Orrville, OH. If the air above your floor has a high concentration of water vapor, or humidity, then the concrete will absorb moisture until it contains water equal to what is in the air. The past 3 years of the 29 years of 100% success has began challenging the compatibility of silicate technology and flooring adhesives. We caution against the Plastic Sheet Method for testing moisture levels in your concrete slab. Get answers to common questions homeowners and business owners have when sealing concrete floors. GCP Applied Technologies provides advanced floor moisture barriers to solve moisture problems for floor assemblies. The problem lies in the short 2 ½ hours of dry time after you neutralized and cleaned the stained surface. They can be applied with a micro-fiber mop, and they dry in a matter of minutes. V-SEAL 101 contains additives that help it soak into more dense substrates such as concrete floors, brick, stone, and stucco. To that end, we recently acquired VERSASHIELD® floor underlayment, a proven, easy-to-install solution that minimizes downtime and reduces the cost of protecting concrete slabs from moisture. When working indoors, it's usually safer to use a water-based rather than solvent-based sealer, especially if the area can't be ventilated. Lay the section on the concrete slab and use moisture-resistant tape to tape all four sides to the floor. I just completed a moisture test (using a calcium-chloride test). After the sealer dried, the floor appeared blotchy, with some areas glossy and others not. I mixed a new batch and proceeded to finish rolling the rest of the floor but at a much faster pace, and I seemed to have no problem. Answer: According to the ASTM standard for conducting a calcium-chloride test (ASTM F 1869), a reading above 4 pounds—the amount of moisture flow in pounds per 1,000 square feet over a 24-hour period—is considered a no-go for sealing. Depending on floor traffic, residential coatings can last 30 years, while in industrial settings it could last 2-3 years. If so, your floor may be too damp to seal - most sealants must be applied to a dry floor. Economical yet functional, wet concrete look. Question: I am doing a stained concrete project using an acetone-based stain. Topical Sealers : Topical Sealers can provide visual enhancement as well as topical protection from stains and chemicals. They tend to wet out faster, even on hard-troweled surfaces. Contact us and view our privacy policy, terms & conditions, and press room. Find out more about two-part and one-part sealer technology and application methods from Surtec Inc. DIY Waterproofing Solutions • If the interior side of the concrete blocks continuously dampens or wet, drain the water accumulated inside the hollow cores by drilling weeping holes in the bottom blocks (3/8" masonry drill) and allow them dry out for four or more days (dryer the better). She earned a BA in communications from Jacksonville State University. If you drive slowly, the mud comes off the tire evenly. The bleach has the added benefit of helping to kill mold and mildew that might have accumulated on the floor. But will buffing be aggressive enough to take out the marks? That being said, you have a slab that should eventually drop below 4 pounds because of the vapor barrier. After 24 hours, check the plastic to see if water has condensed underneath it. Over the course of a few months, the floor looked more and more dull in spots, especially where walked on with wet shoes. These areas look dull because very little sealer remains on the surface to reflect light and produce gloss. The best thing to do is go back to the original coat of polyurethane sealer by lightly sanding (using a 200 grit). Sealing brings out the beauty of a concrete floor by enhancing the color and adding sheen. Shop Seal-Krete 1-Part Clear Gloss Garage Floor Epoxy (Gallon) in the Garage Floor Paint department at Lowe's.com. In general, epoxies and urethanes deliver the best long-term performance and can last years before the need for reapplication. The lighter areas may be a sign of higher than desire moisture causing the color pigment to dilute. Protects from water, staining, and abrasion. When sealer is applied, it fills the valleys, but you may need to apply more than one coat depending on the finish of the floor. What causes this, and should I apply more sealer to remedy the situation? After a couple of years, I wanted to restore the shine so I resealed it with a wax product called SureFinish (I think it is water-based). 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. Can Water-Based Floor Polyurethane Be Used Over Paint? So in this case, moisture was trapped under the sealer, causing the white, blotchy haze. A few coats will keep moisture from entering and help prevent water damage. Concrete's porous nature means that water from under your home can seep up through your concrete floor, making it damp. Taking the time to put down this final layer of protection not only prolongs the life of your floor, but can also enhance and preserve its appearance. You allowed approximately 24 hours of cure time for the overlay, which is standard and acceptable. Understanding the moisture condition of the floor would be a great first step. Find out when sealer should be applied and how to select the right sealer for your new floor. While applying the primer on the first half of the floor, I could see roller marks and bubbles and the primer started to string up on me. View this comparison chart of concrete sealers. I am not a fan of rolling in general, especially heavier bodied materials like epoxies or polyurethanes. This is a large 8,000-square-foot floor in the cafeteria of a local manufacturer, and it receives heavy traffic. A lot of people update their floors as part of refinishing their basement. Pay special attention to the corners and edges of the floor, where cracks can let extra moisture seep in. 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. The floor looked great at first, but after about a month it began to dull again in spots. Using a sealer on your new concrete floor prevents a variety of costly problems from occuring. All rollers produce lines, with more material coming off the ends of the roller as it moves across the surface. Ideal for interior use where odor is a concern. When it comes to sealers, you get what you pay for, says technical expert Chris Sullivan. Sealing the concrete … Although some sealers can be applied with a paint sprayer, many floor sealers are best applied with a standard paint roller. Seal-Krete Lock-Down 1 Gal. I think I may have rolled on the primer too fast producing the roller marks. They also may contain volatile VOCs. The result is a permanent waterproof barrier protecting the floor coverings from moisture damage. The surface has a hard-troweled machine finish, and no additional surface prep was completed prior to staining or sealing. Applying additional light coats of sealer usually resolves this issue. Answer: If you were to look at a concrete floor under a microscope, you would see what looks like an endless range of plateaus and valleys. The higher solids content makes them less able to penetrate the concrete surface, thus requiring additional surface profiling to promote adhesion. Then apply very light coats (800 to 1,000 square feet per gallon) of the wax. The process of osmosis now comes into play—the movement of a liquid or gas from an area of high concentration to low concentration until balance is achieved. V-SEAL 101 and V-SEAL 102 are very similar products as they are both reactive penetrating sealers with identical amounts of siliconate active ingredient, but are optimized for different substrate types. Answer: It's not uncommon for an uneven gloss to occur after two thin coats of sealer have been applied to a stained floor. More information on sealing stained concrete is available in Bob Harris' Guide to Stained Interior Concrete Floors, as well as from most reputable stain and sealer manufacturers. A dehumidifier can help draw out the water, or a floor fan can help circulate the air and speed evaporation of the dampness. Beginning her career at newspapers such as the "Marietta Daily Journal" and the "Atlanta Business Chronicle," she most recently worked in communications and management for several nonprofit organizations before purchasing a flower shop in 2006. Polishing a concrete floor in the basement ranges from $3 to $12 per square foot. Seals concrete against water seepage, water vapor. Test this remedy in a small area first to make sure it is working. Many people opt for having their floors professionally sealed by a local concrete contractor. How to Seal a Concrete Floor Before Applying Vinyl Tile, How to Seal Stained Concrete Floors and Get a High Gloss, How to Get a Concrete Floor Ready for Linoleum, Radon Seal: Basement Waterproofing, Radon Mitigation, and Concrete Repairs Made Easy, Concrete Sealer Store: 10 Easy Tips to Concrete Sealing, How to Clean Concrete Floors to Install Engineered Flooring, How to Clean Your Laminated Floor and Leave it Streak Free, How to Prepare for Laying Tile Over a Concrete Floor. Most two-part polyurethane sealers are high in solids, above 55%. Answer: I think you are on the right track in terms of the other sealers not bonding to the original polyurethane sealer. Copyright 1999-2021 ConcreteNetwork.com - None of this site may be reproduced without written permission, Answers to common questions about sealing concrete floors. If the bubbles go deeper than the surface, you may need to strip and start over. I plan on sealing the stained concrete with a water-based urethane. It's best to wait for days when it's not rainy and the humidity isn't too high to help the floor dry faster. General-purpose, 100% acrylic, interior and exterior floor primer. If you have a concrete floor that’s in continuous contact with a source of moisture, you’re going to have problems. We would like to show you a description here but the site won’t allow us. This can cause issues with mold and mildew, especially if you have carpet or furniture on top of the concrete. Sealing the concrete can help eliminate the dampness on your floor. This is why a vapor barrier under concrete is essential. I did three tests, with results that ranged from 6.13 to 6.58 pounds. Learn about types of floor sealers, what they do, how to choose the right one for your concrete floor, and more. Two-part polyurethane sealers form only a mechanical bond with concrete. First, I applied the primer coat with a roller and then applied the polyurethane, which has a longer pot life, with an airless sprayer. Where a sealer coat starts to come off, light no longer travels through it but instead diffuses, resulting in dull or white and hazy spots. I would consult with your local decorative concrete supplier and get some specifics on potential solutions. Use a sealer designed for concrete moisture protection, such as an epoxy concrete sealer, which often comes in two parts that must be mixed immediately before applying. A concrete floor sealer will beautify and preserve your floor. Solvent-based concrete sealers are extremely flammable and the toxic fumes they emit can be hazardous to breathe. Learn more about the types of concrete sealer. Completely cover a small area with a thin layer of sealer, then move on to the next area. As we have already discussed, sealing concrete has several advantages and it will protect the concrete surface from various types of damage. Vacuum or sweep it thoroughly, then scrub it with a mop. You hit the nail on the head in regard to humidity. Use a solution of one part bleach to four parts warm water to clean the floor. 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. Do this continuously until the entire floor is finished; sealers are most effective when you create a single, solid layer without the seams that can develop if you spread the work over more than one day. Helps prevent the growth of molds, mildew, and musty odors. Question: On a recent stained concrete project, some areas of the floor were sealed with a two-part polyurethane sealer, while other areas of the same floor where sealed with a solvent-based acrylic sealer. Most sealers need 12 to 24 hours of dry time before application, especially when a large amount of water is used in the cleaning process. If you use a penetrating concrete sealer then the product will penetrate deep into the material to form a protective barrier. Time: 01:30 Why Use a Sealer on Your Concrete Floor? Reduces indoor humidity preventing the growth of molds and mildew, alleviates basement odors. The use of a primer or diluting the first coat of sealer are also common methods for promoting sealer adhesion on denser surfaces. Before you seal your floor, check to see how damp it is. 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. After drying for another 24 hours, the floor should be ready for new carpet or paint without dampness. Most manufacturers of high-solids sealers require a well-defined profile before application of their products. Costs to seal a basement floor range from $3 to $12 per square foot. Applying a water-based wax and then a solvent on top was also not a good idea. My suggestion is to try sanding out the marks and then reapply your topcoat. Sealing also preserves the decorative treatment by protecting the floor surface from abrasions and stains. In addition to making your concrete floor more durable in high-traffic areas, epoxy provides a waterproof finish. Here is my question: Because of the high moisture readings, should I do this job? If the HVAC system in the building is operational, run the air conditioner to help remove moisture. The life expectancy of a sealer depends, in part, on exposure conditions and how well the floor is maintained. Concrete is technically porous, which means that unless those pores are sealed up with some other material, the concrete can absorb liquids and stain. Question: I recently applied two coats of an acrylic sealer to a stained floor. If you speed up, the mud flies all over and leaves more prominent marks on the outside edges of the tire. The interior humidity has been high (around 70%) due, I think, to rainy weather and wet drywall mud. Two-part epoxy formulas require use of a freshly mixed batch for each coat. What will the sealer be applied to? For deeper cleaning, rent a rotary floor scrubber with and abrasive pad designed for concrete and use it to apply trisodium phosphate, or TSP, to the floor. Clean and dry your floor before sealing it. Concrete is porous and loves to hold moisture. It begins as a liquid slurry of water, sand, cement, and aggregate, and even after it hardens, moisture continues to pass out of the concrete for years. But, if you are thinking of doing it yourself, here are the steps for sealing concrete floors: Film-forming sealers (those that form a protective film on the concrete surface) are the type most often used for interior decorative concrete work. Why did the two-part polyurethane peel off, while the one-part solvent-based acrylic is still down and performing great? Reactive and penetrating formulas in various levels of gloss. Question: On a project in Florida in mid-September, I applied a microtoppping on a Monday, acid stained the next day, and then neutralized and cleaned the stained surface the following morning. Before drying your floor, clean it well to remove dirt and any built-up mildew. For the best results, the concrete surface should be clean and dry. In other areas, the sealer has saturated the surface of the concrete while leaving the desired film on the surface. Before applying a high-solids sealer, be sure to consult with the manufacturer and perform an on-site adhesion test. Today, high quality concrete sealers can block up to 99% of surface moisture. To eliminate the dull spots and produce a nice, uniform gloss, apply an additional coat of sealer followed by two or three coats of a floor wax or finish. Original Waterproofing Sealer protects vertical Seal-Krete 5 Gal. Be sure to check with the sealer manufacturer to verify the compatibility of its product with the decorative surface it will be put on. Do you know why this is happening? Seal Seal-Krete clear-seal gloss concrete protective sealer is a premium sealer that penetrates deeply to seal and protect painted, stained, textured or bare You left the stain to react overnight, which is also common practice and acceptable. Cost to Seal a Concrete Floor . You don't want a protective finish that will wear away after only a year or so. Depending on the material used, application temperature and pot life, the roller lines may or may not even out. 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. Conversely, one-part acrylics bond both mechanically and chemically with concrete and are lower in solids – typically 20% to 30%. Q: What Does A Concrete Floor Sealer Do? See Sullivan's advice on sealer selection. Wait for a dry spell, open as many windows and doors as possible, use a fan to move air across the floor, and take another test after 24 to 36 hours of drying. This film is the protective barrier and reflects light to produce the level of gloss you want. Basements and garages - the typical rooms with concrete floors - also suffer from poor air circulation, giving the moisture nowhere to go once it seeps through the floor. 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. But I understand the recommendation is no more than 4 pounds. Question: Four years ago I covered my basement floor with a patterned overlay (I am in the decorative concrete business). Now you have multiple layers of different sealers, all of which seem to be wearing. Heavy-bodied materials are always best applied in small batches and with a push-pull applicator such as a lamb's wool or micro-fiber pad or a T-bar. Here's a list of common questions about concrete sealers and how they work to protect your floor. 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. Most sealers are clear, which can make application tricky, as even coverage is key to preventing future dampness in your concrete floor. This method requires you taping a 16-inch square piece of clear plastic, at least 6 mils thick to the floor. This is why profiling the surface – creating more surface roughness – is always called for when working with two-part polyurethane sealers. Question: I recently applied a two-component, high-solids aliphatic polyurethane sealer to a stained floor in a spa. The cause is different levels of porosity in the concrete surface. I stripped the floor with a mild muriatic acid cleaner and applied an acrylic solvent-based sealer, thinking that I needed the solvent to restore the color. Answer: This is a common problem, more often found with water-based sealers. Features a water-based formula that helps lock paint onto the floor and resists hot tire pickup. The sealer never became clear, and the entire sealed surface is hazy, white, and blotchy. Epoxy Basement Floor. If the smell persists after cleaning, you may need to seal the floor with a concrete sealer. 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. Some floor sealers form a protective film on the surface of the concrete, while others penetrate into the floor. Decorative concrete expert, and vice president of sales and marketing with ChemSystems Inc, Chris Sullivan, provides in-depth answers to common problems associated with sealing concrete floors. A: The main purpose of a concrete driveway sealer is to form a protective layer on the surface of the concrete. Seal-Krete 5 Gal. They don't chemically stick to anything, and nothing chemically sticks to them, including oil, gas, solvents, water, dirt, and graffiti. 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. Avoid the temptation to pinch pennies. Some sealers may interact with certain overlays or coloring agents, resulting in unwanted side effects such as blistering, bubbling, or bleeding. What do you recommend to fix the issue? 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. If you’ve already seen evidence of fungal growth in the basement, this basement floor cleaner works well for removing mildew and mold from concrete. Learn more about the types of concrete sealer. Concrete floor sealers protect, enhance and preserve the appearance of your floors. Basements and garages - the typical rooms with concrete floors - also suffer from poor air circulation, giving the moisture nowhere to go once it seeps through the floor. See this video on using sacrificial waxes for concrete floors. This is a very real environmental factor often missed when contractors prepare to seal, especially interior floors. This is the first time I have done a test like this. The essential tool for hobbyists. When I wash the floor it looks great, but the dull spots show up when it dries, and over time I'm getting more and more spots. 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. Even with the high air temperature, the humidity was not taken into consideration. Pay special attention to the corners, where insects and mold tend to live. This is especially true for nonbreathable coatings, like the polyurethane you plan to use. The other major factor is solids content. © Copyright 2020 Hearst Communications, Inc. Epoxy Bonding Floor Primer is designed for use on bare concrete surfaces in indoor and outdoor spaces. If you're after the look of polished marble, choose a sealer with a medium- to high-gloss sheen. The number and depth of these plateaus and valleys is directly proportional to the finish of the concrete. Allow recently poured concrete to cure fully, Let stains or overlays dry thoroughly before sealing, Remove baseboards or cover them for protection, Clean the concrete floor and wait for it to dry, Open doors and windows for proper ventilation, Apply a thin coat of concrete floor sealer and let dry, Apply a second coat in the other direction, let dry, Wax the surface of the floor to prolong the life of the sealer, Reapply the sacrificial wax as it wears off, Reseal your concrete floor every few years. Concrete is a sponge, and if conditions are right it will absorb and hold moisture, both in liquid and gas forms. What is probably happening is diffusion. There are two main sealer categories: topical sealers (coatings) and penetrating sealers (reactive). For a decorative interior floor, a high-build sealer with good resistance to scuffs and staining, such as a polyurethane or epoxy, will generally provide the best protection and be easier to maintain, especially in a high-traffic retail environment. In the category of film formers, however, you'll find several different types, each with advantages and limitations. This floor is on grade, and the concrete is over two months old with a vapor barrier under the slab. When applying your epoxy coating it is important to make sure that you seal the final product, as this helps protect your design for an even longer life. Tape a small square of clear plastic to the floor using painter's tape. A smooth finish has fewer of them while a rough finish looks like the Grand Canyon. In order to seal your epoxy floor here are the steps: This moisture will stay in the concrete until the moisture content of the air above the slab abates. • You will often see efflorescence (white minerals) or mold growth on damp concrete. There is always a trigger mechanism for sealers becoming cloudy or white, and we need to timeline your project to find what it is. Picture a car tire that has mud on it. Testing for Moisture in Concrete. I applied a two-part polyurethane sealer to it. For applications where a high shine is not desirable, you can also find film-forming sealers with matte or low-gloss finishes. Learn more about checking the VOC content. Rinse the floor thoroughly, then use a wet-dry vacuum to remove the water. Answer: This is a case of chemical versus mechanical bonding and solids content. Strengthens concrete reducing concrete dusting, spalling, and … Based outside Atlanta, Ga., Shala Munroe has been writing and copy editing since 1995. Most acrylic sealers are available in a range of sheen levels. Drywall mud, paint and rainy or hot, humid weather can cause high moisture contents indoors, which will cause concrete to absorb moisture. The speed of rolling, the amount of material on the roller and the weight pushing down on the roller also play a role in leaving roller marks. Sealing Your New Concrete Floors Wait at least 30 days before sealing a new concrete surface—whether indoors or out—so that it has time to completely cure first. Therefore, it's advisable to have a floor tested for moisture content prior to installing flooring or moisture barriers. Answer: Sanding will take surface bubbles out, but buffing with a floor machine will not be aggressive enough. Continue drying the floor until your dampness test with the plastic square stays dry overnight. Also, should I apply the primer using a sprayer instead of a roller, and should I mix smaller amounts of the sealer? For example, is 6.58 pounds acceptable but something higher, like 12 pounds, too high? In some areas, the concrete is more porous and most or all of the sealer was absorbed into the substrate. If this does not work, strip down to a point were no roller marks or bubbles appear and start over. 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. Otherwise, you will need to strip the sealer, clean the surface and allow it to fully dry, and then reseal. Avoid moisture by using a dehumidifier in the basement. Vapor barriers are a way to keep moisture from getting into the concrete. Learn More. Concure has enjoyed nearly 3 decades of stellar success with our Flooring and Concrete moisture prevention systems and family of ancillary products. How do I now reseal over the original sealer? This water-based sealer can also be mixed with latex paint to extend the life of paint and improve paint adhesion. These finish coatings are low cost, go down very thinly and are easy to maintain. What went wrong, and how do I fix the problem to achieve a uniform shine? Softer acrylic sealers usually require regular maintenance with several coats of a sacrificial floor finish, or wax, to prevent wear and black heel marks. Polished Concrete Basement Floor Cost. But now roller marks are visible throughout the entire floor, not to mention the bubbles. To remove the bubbles, I was told by the sealer manufacturer to go over the floor with a floor buffer or 150-grit sandpaper and then seal again. 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? Clean a Concrete Basement with Baking Soda. Smith Paint Products 2200 Paxton Street Harrisburg, PA 17111-1038 Office: 717.233.8781 Toll Free: 800.466.8781 (US) Facsimile: 717.232.5199 What went wrong? Original Waterproofing Sealer protects vertical concrete, masonry, metal and vinyl surfaces against the damaging effects of moisture penetration. Concrete slabs and floors can be excellent subfloor surfaces for tile and other floor coverings, but too much moisture in the concrete can cause problems with flooring installations. Also, read the label, because in this case it clearly stated minimum dry times of 12 to 24 hours before application. Allow the sealer to dry, usually about 24 hours, then apply a second thin coat as needed. For an average 700- to 1,000-square foot basement, your estimate could run from $2,100 to $12,000. Do a test area before doing the entire floor. No decorative concrete floor installation is complete without the application of a sealer. There are many different types of concrete sealers. Question: I applied two thin coats of a high-gloss sealer to a stained concrete floor, following the manufacturer's instructions, but some areas of the floor look dull instead of shiny. Four key factors to always be aware of when sealing are moisture, temperature, cleanliness, and application method. This may be moisture in the concrete or the power washing. Concrete slabs appear to be solid and hard, but in reality, concrete is moist stuff. Also what makes them less able to penetrate the concrete water Based acrylic primer concrete supplier and get specifics... People opt for having their floors professionally sealed by a local manufacturer, and it receives heavy traffic the content. Two-Part epoxy formulas require use of a local manufacturer, and more original polyurethane by... Picture a car tire that has mud on it we caution against the damaging effects moisture... Was absorbed into the floor dry in a spa side effects such as blistering, bubbling, or bleeding working... 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