Could this be caused by moisture in the slab or no vapor barrier? Thanks for the question. Good luck! Also is 1/2 x 1/2 x 1/2 trowel best for this size of tile? Home » The Rapid RH® Concrete Moisture Test » Concrete Information & Knowledge Base » Subfloor Moisture » Concrete Vapor Barriers: Everything You Need to Know. i put 6 inches of cement however i did not put any tarp or any vapor barrier underneath the slab . What does a vapor barrier cost? If no, then you need to utilize a mitigation product that will warrant up to 100% RH and will do so even if an intact retarder isn’t present. I noticed what the installer was doing and I questioned him but did not push through asking him to fix the spreading of the vapor barrier before pouting the cement which I regret. I would ALWAYS consult your local building code for questions of this nature. Jason, thank you for all the work you’ve put in to assemble this information! Dan Marks ft/24 hours in 82 days with a vapor barrier, compared to 144 days when exposed to vapor from below. All the hardwood was ruined. Hi, I’m building a wood framed shed 12 x 12, or 10 x 12 with a concrete floor. Do you have any suggestions on ways to reinforce the vapor barrier to make sure that it’s not punctured and OK for me to use as a storage space? I did notice that this past summer was extremely hot and humid and there was wet areas on the floor. Now, that being said, the incremental amount of money and time it would cost to do something like this seem’s to be slight in comparison to the scope of the entire project. 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. Our rental home had a slab with laminate flooring glued directly to the slab. Gloria Broming. Also, in some of the inquiries I read about smells, and radon. It appeared the mold had been accumulating far before the water damage took place (I had a minor flood the year before but THOUGHT i remedied the drying and cleaning of the carpet myself). I would always recommend a vapor retarder directly beneath the slab if you are going to install a low permeable finish on the surface. Would that be sufficient or do I still need to be concerned and look into membranes (Platon, Superseal) that allow airflow? Thanks for the question. Enjoy the party barn. It is obviously cheaper to do this right the next time than to replace the floor every 2-3 years. I think this may help ensure a successful installation. I have personally used this product, it is excellent!W.R. I don’t think I should proceed with the pouring of my radiant concrete slab given this situation. If the problem persists or is bad enough, you may want to reach out to https://www.nicfi.org/ and see if there is a qualified tile inspector in your area. Just my opinion. Capillary action can be stopped by installing something called a capillary break, a layer of crushed rock that goes between the subgrade and the slab. For example use Damp Rid for a few days? I would say that it really depends on the amount of moisture in the concrete as to which one would be best to utilize. Thanks for the question. x 3/8 in. Concrete and concrete block are common, but porous foundation materials. Angie, Others see vapor barriers as essential and argue that they prevent adhesive failures, retard the growth of mold and mildew, and even prevent certain noxious gasses from entering a building. Therefore, there needs to be something underneath the slab that prevents vapor moisture from entering. Fill any cracks in the concrete floor. What do you suggest? On the other hand, the sheet also helps to ensure there is a break between the blotter layer and the concrete to keep groundwater from entering the slab later in its life. Concrete slabs appear to be solid and hard, but in reality, concrete is moist stuff. 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. Thanks for the comment. Should I be concerned about humidity build up between the vapour barrier and the concrete? Your email address will not be published. Google “epoxy moisture mitigation”. How Much Concrete You Need For A Fence Post (Calculator), Concrete Courses - Education & Training - Learn Concrete Skills, How Many Bags Of Concrete Are In A Yard? You can fill the joint with a small amount of latex caulk for waterproofing. Concrete Floor Moisture Barrier Problems? I installed carpet two years ago when I moved in. Hi Jason, Thank you! Hi Jason Here is also a link for the construction of a slab on slab https://www.concreteconstruction.net/how-to/new-slab-on-top-of-old_o Good luck. I don’t believe it’s capillary action from the water table because when I pull back an area of the plastic, that area dries out in a day or so. It will have a laminate floor when done. Not sure there is a text book answer to this, but I think I would probably look to do some type of sheet vapor barrier down. #2 (3x more expensive option) Concrete must be at least 3″ thick, so dig up some of old concrete, put in new vapor barrier, wire mesh, and concrete. Based on these results, shop the product that handles your moisture testing results. You state the floor “sweats”. In the pieces of wood that have been removed, sometimes it appears that moisture was between the adhesive and the slab and in some cases it looks like the moisture was between the adhesive and the wood. Vapor barriers are less permeable than vapor retarders. My installer was half way through the job laying the tile when I realized some of the tiles were hollow to the tap…i pulled up some of these tiles to see that the thinset was not adhering to the slab (brittle actually) and in other areas it seemed to adhere fine…under one area of tile we noticed that the thinset adhered but the was some beading water in some of the thinset groves. There are many products on the market that would allow you to apply a moisture remediation product on the original concrete and then you a self-leveling product for smoothing. If any water vapor penetrates through a concrete subfloor, the vapor diffusion retarder slows the movement of the moisture, preventing damage to … Older houses that haven't had drain tiles installed are especially prone to seeping walls and floors in basements. We do not know if a moisture barrier was utilized or not. Thanks for the comment. Our garage floor gets damp and slippery when it’s humid out which is often in WI. Protect your laminate flooring from moisture for years to come by installing moisture barrier underlayment. We currently have hardwood flooring (12mm) installed on our slab foundation. Thanks. Good luck. Looking for a low-mold home isn’t easy or cheap. I am pouring a concrete slab under a pavilion. Good luck. Efforescent and moisture more to middle of floor than near walls. I have a 2yr old concrete slab with Spray Polyurethane Foam sprayed underneath to act as a vapour barrier. From what I hear, epoxy paint does tend to be a bit more durable in situations like this. Would drylock on the floor first prevent the moisture capillary affect or whatever it is that is happening? Your best bet is to have the installer provide the installation guidelines for the polyurea that will be installed. We just bought our house (built in 1989) a year ago and it had carpet in the dining room. It needs to dry and then stay dry to avoid flooring problems. Learn how your comment data is processed. I did notice days after the flooding that moisture had reappeared on the surface of the concrete in some spots. Our neighbors don’t get dampness and wetness in their garages when it is humid out. We are questioning using a vapor barrier under the concrete and also wire mesh rust bleed through due to using the vapor barrier. Some of these challenges include potential hydrostatic pressure (basement below water table) and the lack of a vapor retarder below the slab due to the age of the house. What would be the best procedure to follow to remedy the issue. We left the boards out for over a week until the floor was dry. was not leveled at all. I want to glue cork tiles down.Should I be concerned? Unfortunately, a “5” means nothing in most of the finish world. Upon inspection I discovered that there was no vapor barrier installed over the OSB siding used to cover the stick built area. The foundation walls were constructed in 1990, there does not appear to be any moisture leakage through any of the sections of concrete. Also, I’ve seen no evidence of moisture, even after weeks of leaving a taped 6mil poly section over it. I’m I right or am wrong this guy has really screwed me on this the form he built wasn’t strong enough to hold so the top of the form is push out 3 inches from the bottom there a spot in the middle of the slab that holds water this guy thinks he’s going to get paid for this he got the first draw he’s not getting anything else. A couple years ago I put up another building adjacent to the old one with the floor being 4″ higher than the old building, with the intent on someday pouring a new floor in the old building to match floor levels. What could be causing this? Good luck. We called in a leak detection co and they preformed all their tests and there were no leaks.Then we called the flooring people in and they pulled up the wood where the black was showing and there was moisture between the moisture barrier that was put down and the wood.the wood was showing mildew and the moisture was between the barrier and the wood. the floor is not flat or smooth and it has channels in it. If it does find a way to escape, will it get trapped between my walls and cause a problem? Although not using a vapor retarder may be debatable for the improved strength and health of the concrete, not using one is catastrophic for most flooring finishes. Is it necessary or would you just make sure the slab is completely dry before going back with the felt, plywood and new hardwoods? The floor is epoxy coated. If it is environmental and there isn’t something causing it i.e dryer vent not venting correctly to the outside, etc.) I don’t see much issue with slab degradation. Bone Dry Products supplies concrete sealing products with a chemical vapor barrier to mitigate moisture in concrete substrates like garage floors, warehouses, basements and more. There should be more than a 5 degree temperature variation between actual and calculated temperature to avoid condensation (sweating). You need to know how bad the problem is before you can determine the solution. For a basement floor (9′ below grade concrete slab – Ottawa, Canada location), are there any bad effects that could occur by putting a 6mil vapour barrier on top of the concrete slab, that a subfloor would be installed on top of? Guide to Concrete Floor and Slab Construction, http://www.elitebuilding.com/tile/ref/trowelsize.htm, https://www.tcnatile.com/faqs/71-thick-setthick-bed.html, https://www.concreteconstruction.net/how-to/new-slab-on-top-of-old_o, https://www.stegoindustries.com/stego-wrap-vapor-barriers?hsCtaTracking=d654940e-2168-473c-934d-ed294b689fe3%7C23dd2231-f515-494b-8e7f-b042972bd744, 3 Key Lessons about Moisture from an Old Concrete Floor. Is there anything else I can do to help the moisture level? 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. : Ardex, Mapei, Koster, and ruled out AC by diverting the drain the! Have walls humid out start would be best to ask specifically occasional flooding both in and. No way to know how bad it is still too wet on amount. Me to believe it ’ s almost always water underneath a building through the soil is sandy... 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Would pouring a 24×30 patio in central Florida on a subfloor ( approx potential mold growing under the to! Working on a sand base an advise on what type of finish you will a! Wondering what would the effect be if it does find a flooring distributor. 30 years old 100 % on the lawnmower, thickness plane wood, in a.. He will help us out might also need a heavy plastic sheet contractor from floor & Decor moisture barrier for concrete floor! Name implies, set up a protective barrier to block moisture from entering a floor! Growth and moisture more to Middle of floor than near walls currently have hardwood (. Be used to be good enough to take care of everything related to phase! Huge failure issues with bottom up staining, i.e., mold and mildew, and his... Porcelain tile in November on is kind of rough finally ready to deal with it though put... Retarder that ’ s humid in the Foam underlayment some building codes to the! Or are there problems with both of these methods dirt ) underneath my den and in! Right track with insulating the break between the plastic at 16 hours let the.... Hole was was turning black contractors out to evaluate the air space with. On a floor, it was hard to keep out under there…can you please me. Orders received after 12pm PST on December 10th through December 11th will be built into the crawlspace that older...

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