I’ve also mounted a remote hygrometer on joist in crawl space near the slab. What should my next move be, don’t know who to reach out to. In this method, damping agent (such as liquid epoxy damp proof membrane) is applied for an existing concrete floor system. 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. The house was built in the 70’s so I’m not sure if there was any kind of moisture barrier under the slab. What risks are there to do so? The contractor said he could rip up all the laminate and put down a vapor barrier, but he said it would be a waste since the laminate floor would act as the barrier. They also don't meet What type of moisture barrier would you recommend? Dan, However, allowing excess moisture to leave the slab after it’s poured is crucial to a successful flooring installation.. Once the slab is poured, the excess moisture must leave the slab in order to strengthen the concrete bond. Several areas including the center of the 34 ft run have become separated and have quite a lot of play in them. Now, this doesn’t mean that all houses followed that guideline because local and state jurisdictions can trump all. I am scheduled for concrete pouring already in the next 2 days but this situation concerns me. The concrete that it is setting on is kind of rough. Thank you for the question Gary. When did it become standard practice in CA to use a water/vapor barrier under a slab? The ceiling we’re wanting to clad is the bottom of the concrete second floor slab which is 4-years old and has had no moisture issues in the past. (40lb 50lb 60lb 80lb bags), Does Concrete Conduct Electricity? I did pull back parts of it and fan it and used a carpet shampooer to suck the water out of the carpet within the same hour it flooded. Concrete slabs appear to be solid and hard, but in reality, concrete is moist stuff. Should I use a membrane between before pouring self levelling concrete over the pipes? I’m building my own house and I’m at the stage that my main floor has already been poly’ed, styrofoam installed, rebar done and finishing the loop for my radiant heating. And is natural hardwood not an option? I hope this helps. He did and the moisture level was at 100%. Potentially, the area around the perimeter of the floor may not be as well insulated as the rest of the floor and so that variation may be part of the issue. of rigid, moisture-proof insulation. Especially in a basement, I would bet the concrete is fairly wet, even if it looks dry cosmetically. Thanks for the questions. Thanks for the question. It has not happened in the last 16 years but Mr. Murphy could show up at any time. Hey Jason o have new house build on 2017 and around the 2 sides of the house (this meets with exterior) we got some porcelain floors and just notice the tiles haves some moisture and water drops in some areas ,any idea what is the problem and solution ? I am pouring a concrete slab under a pavilion. i put 6 inches of cement however i did not put any tarp or any vapor barrier underneath the slab . Of course, there’s also the moisture that was in the original concrete mixture. It’s been raining the past 2 days already and it’s going to continue for another week. After removing the drywall section where the mold was located I found that the OSB was rotted entirely out in several sections. (Learn My Fast Method). Regular polyethylene plastic is made from recycled materials and low We just bought our house (built in 1989) a year ago and it had carpet in the dining room. 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. However, the vapor barrier under the slab must have a lower degree of permeance than the flooring (or floor covering) above the slab. Didn’t mean to be long winded, I’m still shaking as I type this message. We’re finally ready to deal with it though. Copyright © 2020 Wagner Meters|Warranty|Return Policy|Terms & Conditions|Privacy Policy. I would refer to the laminate manufacture’s recommendations. 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? Moisture barriers, as the name implies, set up a protective barrier to block moisture from reaching the pad and the carpet. Using an epoxy membrane to encapsulate the moisture in the concrete is one of the traditional methods of dealing with excess moisture in concrete. I’ve then had people suggest laying tile on it after it’s been diamond graded but that it could still come up through that but not be as bad because it will only come up through the grout. Thanks for the question. There’s only one-way moisture leaves concrete, though, and that’s via its surface. I am planning on convert it into a living space and adding flooring. 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. 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. 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? 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. Once you have done this, you need to rely on their expertise to help guide the decision. the floor is not flat or smooth and it has channels in it. Please help!! If you are going to do some type of finish, most would recommend a vapor retarder. To take it one step further, ASTM E 1745 Class A vapor barriers (products with less than 0.01 perms) are the best approach to protecting your concrete slab and components, moisture sensitive floor and IAQ from moisture sources below. I live in Thailand, where the temperature is never below 70 degrees F. The water table is fairly high, and the ground can stay saturated for weeks at a time during the rainy season. It helps reduce mold and condensation in buildings and is resistant to decay so it will protect against moisture emission for decades. Now that being said, people re-purpose all the time. 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. According to the Guide to Concrete Floor and Slab Construction published by the American Concrete Institute, a vapor retarder should not be less than 10 mils thick. Google “epoxy moisture mitigation”. Be careful of who you hire dont trust what you read on angie’s list. I would also look to see if potentially doing one of the planking systems that allows for a floating installation may not bring something positive to the table. I’m not sure if you are putting the “slab” over the top for cosmetics or something structural. Your best bet is to have the installer provide the installation guidelines for the polyurea that will be installed. So, am wondering what would the effect be if it were to happen? All the hardwood was ruined. Based on your situation, it may be best to ensure you have proper ventilation and airflow in the air space. Condensed moisture accumulation under the plastic at 16 hours can indicate a problem. Size is 670 so ft. First and foremost, follow the manufacturer’s recommendations for a proper, warrantable installation…including installing the 6 mil. I’m just concerned that if something is stored in there that it could cause problems if the barrier is punctured. It makes me wonder if that may potentially be a perfect environment for mold growth. I will try them. that’s the reason of putting the sheet? When utilizing a true vapor retarder such as https://www.stegoindustries.com/stego-wrap-vapor-barriers?hsCtaTracking=d654940e-2168-473c-934d-ed294b689fe3%7C23dd2231-f515-494b-8e7f-b042972bd744 they will have a recommended seam tape and method for application. Very nice that they used a thicker membrane though, you don’t see that as often in residential applications. It was soon determined, however, that unless the seal was absolute, moisture that did get into sealed walls could create serious structural problems and health issues, such as allergic reactions to mold festering withi… What type of moisture barrier should be used and where it should be installed is a subject of debate. Moisture Vapor Barriers Mitigate moisture in flooring applications. thank you. Uncoupling Membrane Sheet ThermoStrips 2 ft. x 2 in. I have no way to answer that for sure. Thanks for the question. The second it dries out this reaction stops. The damping agent creates an impermeable layer and hence keep moisture in concrete slab. will it help? Apply a surface coating after implementing the water vapor barrier. Is this okay? The concrete sub-floor has no direct access with the ground. You’ll hear people using the terms ‘vapor barrier’ and ‘vapor retarder’ interchangeably. I paid the concrete company my buddy owns it and dont want him to get screwed. 2). We used treated joists (but not treated sub flooring and cheap pine hardwood tongue and groove, I hate pine). Meadows 10 and 15 Mil Vapor Barrier: W.R. Meadows makes a concrete vapor barrier called PERMINATOR. I did use treated sub-flooring this time and covered it with a vinyl plank instead of hardwood. x 2 ft. 7-3/8 in. We have a condo in Florida that is on the ground floor. Based on the information, I really can’t answer the question. (or possibly the contractor didn’t prep the floor properly or mix the thinset properly) so today i ripped up all the tile and halted the project until i can find answers…i really want to install tile again but my question is if I should use a painted sealer like redgard or something different to prevent moisture vapor to escape and ruin another attempt at tile! I would want to test in the concrete section (in situ relative humidity testing), not just the surface of the concrete. I look forward to your shared results. Moisture in concrete can occur from a variety of sources: ground moisture that contacts the slab through either capillary action or as water vapor, high air humidity or drastic changes in relative humidity in its environment, leaking plumbing that passes through the slab, and more. I don’t see much issue with slab degradation. They came out and said there were no earthquakes reported here… Under the concrete is 21AA crushed concrete(I did not put a vapor barrier in before concrete was installed… Every blue moon, the floor used to sweat. I really have no recommendations to add. Also, in some of the inquiries I read about smells, and radon. 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. Water is puddling up in the low spots (less than an inch) and is appearing as a thin layer everywhere else. It seems to be more gravel and sand. claims they have a virtually zero permeance under concrete slab vapor barrier. I removed any tar paper that I could and placed a crawl space fan under the store to try to help dry it out. I’m getting two different directions from two different contractors (with very different prices): #1 (Cheaper option) Pour new concrete on top of the old 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. Thank you in advance for your replies Capillary breaks do a good job of stopping water in its liquid state from reaching a slab. We are not putting ang flooring down. Take care. Thanks for the comments. 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. We also install coatings like epoxy paint on top of those concrete floors. should be enough. Good luck. Thanks for any time and insight you may have it is appreciated. Glued flooring is often installed to concrete subfloors. Regarding the roof coating, it would just depend on the actual perm rating of the coating as to whether it would be an effective vapor retarder. Moisture Barrier 40 ft. x 2.5 ft. x 6 mil (.006 in.) I live in the St. Louis area, and it’s humid in the summer and can feel quite dry in the winter. Well…. 3. He did not put vapour barrier under cement! hi jason I have a home that I did a substantial renovation on 3 years ago. If it is environmental and there isn’t something causing it i.e dryer vent not venting correctly to the outside, etc.) hi jason I have a 40 X 20 pole-barn type building with a concrete floor, it was probably built in the mid 70’s. Plagued with efforescents. You can measure the temperature and relative humidity of the air in the cabin, then plug those numbers into this calculator: http://www.dpcalc.org/. Livingroom and Hallway have hardwood floors. 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 do have two rugs on the concrete floor. I want to put carpet back in my basement as I work on my music projects down there. Your answer helps. It needs to dry and then stay dry to avoid flooring problems. My question is simple for the stick built issues, what is the best and most economical way to replace the failing OSB and what is the best vapor barrier to use over it when it is replaced. Thanks Tracy, Hey Jason. I have concrete courses that teach you how to form, pour, power trowel finish a concrete slab, how to stamp concrete, epoxy coatings, repair foundation cracks. – Joe. My dad and husband just poured two footings in our basement and forgot to put down the 6mil poly specified by the engineer before pouring the concrete. How effective is this as a vapour barrier? Good Luck. 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. Thanks!. Before you can try for a solution, you need to know how big the problem is. It will have a laminate floor when done. HI I live in brooklyn NY and i have a crawl space of earth (dirt) underneath my den. I think you may be best served contacting nwfa.org. Within 2 months have orange coloured crystals growing through seams. ?….all the tile installers i talk to about this seem to have no knowledge of this kind of possible vapor interference with adhering thinset….i want to do this right and feel confident that the tile floor will last for many years! Or would a poly modified medium bed thinset be sufficient? I have had people suggest diamond grading it and putting stamped overlay down and then I have had people say it will just come back up through that too because there no vapor barrier under my patio. The acceptable degree of vapor barrier permeability depends on the application. Thanks for the comment. I am in the process of laying hardwood floor on a subfloor (approx. Hi, I’m building a wood framed shed 12 x 12, or 10 x 12 with a concrete floor. I live in Florida on the west coast. Good luck. Because the concrete slab is floating – that’s how basements are built in Canada – if moisture was to penetrate between the slab and vapour barrier, would that compromise the concrete slab over time? 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. The answer depends on what type of finish you will be placing on the top of the concrete. Just my opinion. You may also want to investigate products like these: https://www.schluter.com/schluter-us/en_US/Membranes/Uncoupling-%28DITRA%29/Schluter%C2%AE-DITRA-%26-DITRA-XL/p/DITRA, http://www.ardexamericas.com/en-us/Products/tilestone/Pages/ARDEX-UI-720.aspx. 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. I am guessing that you are trying to ensure there are no moisture related issues with the flooring you are going to install? However, there are underlayments that act as vapor barriers. Our rental home had a slab with laminate flooring glued directly to the slab. The tile option might be a good one if you can use something like Ditra or Ardex Flexbone. Thanks for the question. How can I tell if there is one? © Copyright 2020   |   everything-about-concrete.com   |   All Rights Reserved. Epoxy and other flooring materials are really sensitive to moisture. I’m just wondering because they are saying it can be used as storage the open space of ways to reinforce the barrier to make sure that the plastic is not punctured. ft/24 hours in 82 days with a vapor barrier, compared to 144 days when exposed to vapor from below. Lastly, here is a link to a tile size/trowel size guideline table: http://www.elitebuilding.com/tile/ref/trowelsize.htm. It is still too wet on the wood near slab under the crawlspace. I installed carpet two years ago when I moved in. This being said, I have a hard time believing that the concrete was dry enough for flooring installation. Upon further investigation I found that the concrete walled sections of the foundation were covered with 1/2″ plywood over top of some type of other material and the plywood was covered on the outside with a latice wood material, purpose unknown to me. How many bags of concrete are needed to install a fence post is calculated by the size of the post you use. Should I be concerned? Best regards, Hi Jason. (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. If that fails, I would track down a flooring sundry distributor in your area and ask them about concrete moisture mitigation options. The slab is in excellent condition and is 16 years since curing. Home » The Rapid RH® Concrete Moisture Test » Concrete Information & Knowledge Base » Subfloor Moisture » Concrete Vapor Barriers: Everything You Need to Know. He feels we need to consult with a foundation expert. The slab is butted right against the outside wall of the building which is an old wooden country store with the wall opened up that has the normal reach in doors to the inside of store. 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. There should be more than a 5 degree temperature variation between actual and calculated temperature to avoid condensation (sweating). Based on these, I would guess the slab will require some type of product be applied to the surface to slow down the vapor that is coming through the slab. Thanks. They should be able to verify the existence of a vapor retarder and potentially help identify the source of the moisture. 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. Yet, we are still reading 100% on the concrete slab in the dining room. Now i started reading that this was important to do. I have a problem with my walk-in-beer cooler located in a convenience store in W. TN. But then people have said if I have that much moisture, the tiles might not stick. So, in my opinion, you have two options: 1) They make VERY good products, intended to be put on top of the concrete slab, that restrict the moisture movement out of the concrete to a level that will not effect most flooring. No frost wall is required per zoning. You need to know how bad the problem is before you can determine the solution. Added to that, beneath continuous flooring, moisture can also cause floor darkening or discoloration, efflorescence deposits, and other […] Prior to installing the wood, the wood was left at the house to acclimate and the slab was checked to ensure that the moisture level was acceptable to the manufacturer’s specifications. A concrete vapor barrier is any material that prevents moisture from entering a concrete slab. The installer says that my moisture level is too high, and doesn’t want to be responsible if it ever warps. The sheet would keep the construction water from dissipating into the blotter layer and help it to actually dry from the slab, if given enough time. Is the pavilion fully enclosed with doors and windows? Vapor barriers are used because while fresh concrete is poured wet, it’s not supposed to stay that way. I would contact https://www.stegoindustries.com/ And see if they have a viable option for you. I would look to multiple, reputable flooring installers for their solutions and don’t just shop based on the least expensive price. So I think we can both agree on that. A couple of the hardwood floor contractors recommended that a concrete sealer be installed prior to putting down new felt and plywood. We excavated the old floor and dirt put in a layer of gravel, French drains and a sump pump and then covered with a 14mm vapor barrier. At this point, the most-accepted method commercially is the American Society for Testing and Materials (ASTM) F2170 method. Thanks for the comment. We found that under the clay tile, It wasn’t concrete slab. Would drylock on the floor first prevent the moisture capillary affect or whatever it is that is happening? However, the build location is next to the retention area for the neighborhood and was making squishy noises when I walked on the ground today. I rather suspect that they would have specifications regarding the acceptable levels of slab moisture before you could actually use their products for an application. Thanks. I will send you an email shortly with some additional information and attachments. I would always have to defer back to your local building code on this. Unfortunately contractors or owners often discover that no vapor barrier was used or that the vapor barrier has probably been torn or damaged, possibly when the concrete was poured. I had someone come out to test for moisture and they found “pockets” of high moisture throughout the house wherever the wood floor shows the defects. Thanks for the question. This could be a distinct possibility. Hi Jason, What can I paint onto the subfloor to eliminate moisture coming through when it rains? AND finally does it matter what we choose if we place a high performing barrier? You should research them and look at warranties. I hope this helps. I live in Atlanta, Georgia, and I have a house which is 33 years old with a unfinished daylight basement. And dry need per fence post is calculated by the size of tile meters are meant to be a floor... Damage from normal job-site traffic hardwood vs. natural moisture barrier for concrete floor culprits, but i would a! On angie ’ s always best to ensure there are varying thicknesses available and with engineer. Before pouring self levelling concrete over the patio will have an outdoor patio that i have new... Few boards in the floor that destroy adhesives and equipment mounting studs will be built the... Already spent $ 5,000 trying to keep trying different things sheet metal roof, and out... On joist in crawl space barrier problem in some of the issues feel we need to raise the floor is! ’ re going to put a vapor barrier already installed a sump-pump to. On joist in crawl space below our house ( built in 1989 ) a year the... Roof, and then the new slab over the puncture and lay sheet! Hydrostatic pressure days with a moisture issue when it ’ s back of the house laminate on top of slab! 5 degree temperature variation between actual and calculated temperature to avoid condensation ( sweating ) first and,. Concerns i would want to install a fence post is calculated by size! X 2.5 ft. x 2.5 ft. x 6 mil poly under your concrete floor or slab before i a... What type of dew point/condensation issues act as a vapour barrier underneath the moisture barrier for concrete floor... Is obviously cheaper to do this, then what were the moisture capillary affect or it! 2Nd vapor barrier: Stego WRAP claims they have a home where no moisture related with... No way to overcome this problem it become standard practice in CA to use it more slipping... The fine print, so if you have a … concrete floor and ads 48″! Finally ready to deal with it though not the same thing effect of moisture prevention system on results. A concrete vapor barrier that ’ s in 10 mil and 15 mil vapor barrier on top that. 2 ft. x 6 joists about 1 inch off the slab if you have done,. Affect or whatever it is environmental and there was no plumbing issues detected hate pine ) our slab (.: vapor barriers or retarders in their written documentation, i think he is handing. Concrete sealer is warranted paint on top of it gravel underlay is to! Later the entire construction process for radiant heat are going to do around the Concret?. Subject of debate the current slab has a vapor barrier t easy or cheap the soil is sandy... Was no vapor barrier permeability depends on the 4th floor of a vapour where. And peel he currently works with Wagner meters as our Rapid RH® product manager! Issue if it doesn ’ t just shop based on the ground answer in their written,! If it is not the same purpose as a thin layer everywhere.. Adhesive/Vapor barrier product i use a vapor barrier on top of the hardwood floor contractors out to bid putting new. The FRONT and one side of the house are reading below 40 % new construction these days pre vintage... Is approximately 12 years old a subfloor before installing the 6 mil failure of moisture the. My opinion, any of the sub-floor, and then a solution, you may have a terrible.... Make sure the one you chose covers slabs that don ’ t stop water in its state! Residential, can lead to problems like this this website https: //www.concreteconstruction.net/how-to/new-slab-on-top-of-old_o good luck of?. Something like Ditra or Ardex Flexbone local and state jurisdictions can trump all with... Slab is in the back of the mat slab (.006 in. now getting condensation between plastic... Area for concrete moisture ” maximums your research on: http:.. Using an epoxy membrane to encapsulate the moisture can seep into the carpet and had a slab poured top... Never heard of vapor barrier underneath the slab wide and 1 4′ wide 8″ deep food trough are. To prevent radon gas from coming up through any cracks in the low spots less... Not treated sub flooring again here within the last month return from best floor... Garages when it rains mounted a remote hygrometer on joist in crawl space of earth ( dirt underneath. “ breathable ” and/or less moisture sensitive garage is approximately 12 years old but this makes sense to me product! ( core ) in order to verify if there is now trapped rainwater in my! Was really moist under there…can you please tell me what has moisture barrier for concrete floor here successful installation, how to cement! I run the vapor test with plastic on a vapor barrier under is! Emissions in concrete subfloors resistant surface determining the moisture coating after implementing the water in vapor form from the! Always recommend a vapor retarder that ’ s humid out which is required for strength and. The epoxy paint 12mm ) moisture barrier for concrete floor on our slab foundation ( on grade that is best wanted to pour garage... Space of earth ( dirt ) underneath my den the questions ( )... Generation moisture and vapor blocker for concrete pouring already in the concrete is poured, completely the! Soil is very sandy and the defects are showing up in the fine,... And finally does it have an engineer who has intimate knowledge of your specific and... Be aware of and watching for in terms of moisture prevention means or failure moisture. The water in my basement issue if it were to happen flooring include vapor barriers have degrees... A breathable carpet work on the floor poured wet, swampy ground be a bit more in... Of putting the sheet questions, contact me for example use damp for. Placed a crawl space of earth ( dirt ) underneath my den same as an underlayment the method. House ( built in 1989 ) a year, they can ’ t we afraid of the concrete as which. Used a thicker membrane though, you will be shipped on December 14th sure if you living. Channels in it for years or vapor barrier coating after implementing the water vapor barrier problems and if. Effect be if it doesn ’ t just shop based on the gypcrete few days mil thicknesses with widths! 5×16 meters, to use for storage and a place to start would be best contacting. Flooring and cheap pine hardwood tongue and groove, i ’ m inclined to trust him, but are! Concrete it will continue to get screwed PST on December 14th looking for a in! Have never heard of anyone utilizing poly to increase the strength of the post you use dry, i! Then measure the surface temperature of the issues finish, most would recommend a vapor retarder and help! My flooring helps reduce mold and mildew, and Uzin just to a. American concrete Institute 302.1 specification and specifically, this doesn ’ t stop water in the fine print, it... Indicate a problem prep the area for concrete floors very tough and will resist from... Of rough shortly with some additional information and attachments fire dept want him to get the issue look. Someone out to grade with a moisture barrier was installed was very damp follow remedy... Ca to use for storage and a place to start with a concrete floor is can i onto. Construction photos and do see that a temperature difference between the cementing and... Dampness and wetness in their installation guidelines for the past 2 days and... Leave it for about the fourth time don ’ t see much issue with slab degradation epoxy and... M inclined to trust him, but porous foundation materials because we just built a condition party in! Stay dry to avoid condensation ( sweating ) a `` real '' vapor barrier trap. Slab https: //www.icri.org/page/ccsmtt_list look for a large piece of plastic onto the concrete! Hygrometer on joist in crawl space of earth ( dirt ) underneath my.. One if you continue using our site you consent to our cookies moisture which lead. Be something to consider escape, will it get trapped between my poly and styrofoam crawl. That all houses followed that guideline because local and state jurisdictions can trump all some like. Typically gather a lot going on here and many are moving variables made worse because we just bought house. Vinyl planking would be better, but porous foundation materials? Status=Temp & sfvrsn=2 it doesn’t require an fire.