I don’t claim to be a radiant heat slab construction expert, but I would think you would want things as dry as possible prior to the pour. Here are some of the company's and their products.15 mil Vapor Barrier by Americover: Americover has a high performance 15 mil vapor barrier for installation under concrete floors and slabs that will retard moisture migration and radon from escaping through the surface of the concrete floor. (we’ve had copious amounts of rain over the last two weeks) They promise that once we get grass down on the ground and the ground is graded we should have no issues with moisture. Say 12″ X 12″ tile or a breathable carpet. Also, in some of the inquiries I read about smells, and radon. Bostik Slab-Coteâ¢ Extreme Moisture Vapor Barrier Coating is a single coat, two-component, 100% solids, epoxy formulated to dramatically reduce moisture vapor transmission and surface alkalinity from substrates. Would a vapor barrier padding prevent this or would it just keep the mold on one side of the barrier? What is your thoughts on this? I hope this helps. Please help!! Sorry you are having these issues. You may want to also look at power vents that may assist with increased airflow when preset levels of relative humidity and/or temperature levels are hit. Can you please provide further clarification? Based on these results, shop the product that handles your moisture testing results. Hi Jason, I have a problem. I would ALWAYS consult your local building code for questions of this nature. Thanks. Added to that, beneath continuous flooring, moisture can also cause floor darkening or discoloration, efflorescence deposits, and other [â¦] If you have concerns I would have an environmental specialist come out and evaluate the air quality in your living environment. My two main thoughts are potential mold growing under the vapor barrier, and potential slab degradation. I’m thinking maybe I need to insulate the cooler floor(top of slab) to possibly help so it would keep the cold from permeating down through the slab (basically raising due point), or some how or another insulate the exterior of slab that is exposed to the crawlspace to keep that moisture from wanting to stick to the cool wall of slab. Yes, Here's Why, How To Pour A Garage Floor In 17 Minutes! If Pergo is the finished product, I would start by calling their technical hotline (after quantifying the moisture levels) and asking them for recommendations or guidance. The current slab has a vapor barrier already installed. We decided to get LVP in the kitchen. If you liked this, please share. If this was my project and I had done it multiple times without success, I would do a small test area first. I don’t think I should proceed with the pouring of my radiant concrete slab given this situation. Two shorter run areas have screws that we have discovered that are supposedly to keep the floor from buckling and the screws are in about 24 ft runs. Good luck. This leads me to believe it’s condensation. I’m hoping you can guide me in the right direction because i’m in the middle of a basement flooring nightmare…our house was built in 1977 and we have a walkout basement. I have personally used this product, it is excellent!W.R. If you find beaded condensation in your moisture test, you may have a concrete vapor barrier problem. During the energy crisis of the 1970s, a prevailing belief took root where it was thought that tightly sealing walls and ceilings with a vapor barrier was essential to blocking heat transference and reducing energy costs. I would consult a local geotechnical company for additional information regarding performing the service. Do you have any other recommendations? Hi Jason, Is a vapor barrier below the slab sufficient or would you recommend also treating the slab w/a liquid carrier or lay one down before applying flooring? I am not sure about the moisture being trapped in the foam, but there is a distinct possibility that the moisture could be because of some air quality issues. i going to put a new slab over it. Or are there problems with both of these methods? What type of moisture barrier would you recommend? – Joe. It is an old building built in the early 70’s which purchased 4 years It had mold remediation done but we do not have contact with the previous owner to query where this work was done. Understanding moisture vapor transmission. As far as any topical treatment, I would need to moisture test to determine that. I am getting ready to strip it for about the fourth time. I’m inclined to trust him, but what do you think? Thanks for the question. What does a vapor barrier cost? Also, would you see a need for wire mesh in this situation? Here are the parameters: Materials can be separated into four general classes based on their permeance: Although this is not specific to them, they have a recommended installation process for hardwood flooring that utilizes installing plywood on the concrete, prior to the finished product. x 3/8 in. I need you help or is something I need to do around the Concret slab?? I hope this helps. So, am wondering what would the effect be if it were to happen? They also don't meet Hi Jason, our garage is approximately 12 years old. I think this may help ensure a successful installation. However, strictly speaking, they aren’t the same thing. 2) Try to find a flooring product that is more “breathable” and/or less moisture sensitive. We know we will need a moisture barrier, but because of the issues feel we need to use engineered hardwood vs. natural hardwood. These two part liquid epoxy moisture barriers offer superior protection against vapor emissions in concrete subfloors. The company's who manufacture these new vapor barriers make them in 10 mil and 15 mil thicknesses with different widths and lengths. The concrete slab is then poured on top of it. Just using concrete as the floor. Vapor barriers are a way to keep moisture from getting into the concrete. Could this odor be caused from the moisture coming from the cement and trapped in the foam underlayment? Our garage floor gets damp and slippery when it’s humid out which is often in WI. If this is the case, research some of the various moisture mitigation products available that are topically applied to the slab. I would want to test in the concrete section (in situ relative humidity testing), not just the surface of the concrete. I must also add that we find that most of the floor area other than where the defects are to have very low/no moisture. There are huge failure issues with bottom up staining, i.e., mold and mildew, and they are determined to stick with vinyl. The hardening process of concrete is a chemical reaction between the cementing material and water. Concrete typically has a high moisture content, which is required for strength, and the slab tends to absorb moisture from the ground. I have been told to fold it upwards at the perimiter a couple inches, bringing it up in front of the baseboard, and then attaching quarter round against it. ASTM International gives specific guidelines in ASTM E1745-17 and ASTM E1643 for the use, installation, and inspection of vapor barriers used under concrete slabs. Do I need to dismantle my rebar and styrofoam to dry the potential puddle sitting on top of the poly? Granted i did let the carpet sit for about a week before pulling it up entirely. this is why i’m doing the slab so i have one solid and flat floor. We had the carpet replaced in one bedroom soon after we moved in, and the installer recommended that we keep the underlay as it was a good brand and still very new, but it was never lifted. Hi Jason Looking for flooring underlayment? However I noticed when the vapor barrier was laid down there were some gaps of a couple inches of exposed gravel on a couple of the sides and probably the overlap and sealing was not done very well, so I’m concerned that there is some exposed gravel right beneath the new cement pad in several places. Thereâs a lot to cover, so if you have any questions, contact me! I'll show you my method for pouring a garage floor in 17 minutes. I am in the process of laying hardwood floor on a subfloor (approx. If this is a slab on grade vs slab below grade (which you don’t specify) then I am not sure why solid wood would not be appropriate. I would say that it really depends on the amount of moisture in the concrete as to which one would be best to utilize. If you think the concrete sealer is warranted, is there a particular product you recommend? Should we cut a hole (core) in order to verify? Usually performing a core test is the best way to confirm the presence of a vapor retarder. If you just going to leave it as concrete, cosmetically, for now and the future, most probably wouldn’t utilize a vapor retarder. Now we don’t know what to put down. I would always recommend a vapor retarder directly beneath the slab if you are going to install a low permeable finish on the surface. The cooler is sitting on a bare slab appx 6’x16′. I think you may be best served contacting nwfa.org. Thanks for the question. Now i started reading that this was important to do. It will eventually be turned into a music room with climate control, flooring, etc.. Well…. Thanks for the comment. the barn is on the pad. I look forward to your shared results. was not leveled at all. The amount of bags it takes to make a yard of concrete is 90 (40lb bags) See the complete list for different weight bags on this page. Duct tape an 18-inch square piece of plastic onto the exposed concrete and leave it for 16 hours. A concrete vapor barrier is simply a sheet of polyethylene plastic (Visqueen) placed directly on top of the sub-grade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete. Prepping for polyurea coating…. Moisture Vapor Barriers Mitigate moisture in flooring applications. Thinking of starting your own concrete business? Any ideas? That being said, yes moisture vapor can condense under the 6 mil, but the odds are it will be a constant flux of condense and reabsorption back into the concrete. Your best bet is to have the installer provide the installation guidelines for the polyurea that will be installed. Thanks for the comment/question. Perminator vapor barriers help reduce the penetration of moisture and water vapor through the slab and into the building, which helps reduce mold, fungus, and mildew. They told us they could only install Vinyl since our concrete floor moisture levels are too high. The subfloor will consist of 2 X 6 joists about 1 inch off the slab. Thanks! x 2 ft. 7-3/8 in. I was wondering if it would be a reasonable plan to spread a layer of fibered roof coating over the existing concrete to make a seamless vapor barrier before pouring the 4″ slab over it? 2. Angie, There are various opinions, but this makes sense to me. I’m curious if I need to put visqueen and support wire down before I pour a 10 x 12 concrete floor on the west coast of Florida? 2. Thanks for the question. While I cannot soak up any excess moisture with a towel, a Damp-Rid container fills up in about 3-4 months time, so there is definitely excess moisture in this one room. We haven’t had any leaks so we are assuming it is coming up from the concrete. 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