I agree that this is not as challenging as burying foam in dirt, but I still would recommend EPS/XPS over polyiso here. Do you have any advice on how to proceed if the concrete slab is sloped? I appreciate the tips and the photos. They both come in various rated compressive strengths from 10 psi to about 80 psi. But if you have any doubts, you should contact your local building department to find out how local inspectors interpret the code in your jurisdiction. My instinct tells me that you shouldn't put 1,000-pound cast-iron power tools on top of rigid foam. Another idea is to lay a dimple membrane like DMX/Delta-FL, then something like a 1" rigid EPS/XPS onto that. I'm nearly certain the contractors did not install a vapor barrier beneath the slab. Honestly I think I'd be mildly concerned about the bottom plates on the partition walls. If you’re building a new cold-climate home with a basement, you’ll probably want to install a continuous horizontal layer of rigid foam under the basement slab. TARGET AN APPROPRIATE COMPRESSIVE STRENGTH. Moisture control is provided by a vapor retarder under the slab. In these cases, adding insulation above the slab is a quick and cost-effective way to improve the energy-efficient and comfort of a building. For my floor, my plan is to put down a layer of rigid foam over the slab. And then I'll put a wood floor over that. Uncategorized insulate raised floor over concrete slab. © 2021 The Taunton Press, Inc. All rights reserved. I've been looking at all-in-one products like Dricore, but I'm not sure it's the best bang for the buck within the 1.5". I don't recommend the use of DriCore. If you install just one layer, you’ll need to fasten the OSB or plywood to the concrete slab with long Tapcon screws that extend through the rigid foam. Installing insulation prior to the pouring of a concrete slab floor improves the energy efficiency of the floor and makes it more comfortable. Thermal and acoustic insulation of structural slabs with Expanded Insulation Corkboard acting simultaneously as insulation against airborne noises and reducing thermal losses. Expect the price to fluctuate between various companies – each and every company have different operation expenses and over … I have a question regarding your mention of using interior poly for the basement floor in an interior-foam retrofit: should the poly extend up the walls and, if so, how far? - Typical basement furniture, bed, Home Theater chairs, Heavier loads may include: It's possible that you have correctly identified his concern. Moisture Management. But you should probably check out this article: "Foam Under Footings." Both EPS and polyiso should be available. ", A. Would a foam subtractive method be totally crazy i wonder? Reid, Assuming I utilize Dow XPS insulation, I believe for crawl spaces, I can install without a thermal barrier or ignition barrier. Construction Details including BIM objects and CAD drawing files for Enclosure Solutions Foundation Systems are available for download below. This is a complicated topic. - It should be at least as good as the Amdry product that has a layer of foam and OSB glued together. A. Where the heating is likely to be turned … In your climate zone, you probably don't need rigid foam for this floor. So I now have a second floor space that never existed originally. That article includes lots of technical information and links to references discussing the bearing capacity of various types of rigid foam. Would that work? I'm currently building a home in North Louisiana (Climate Zone 3). Hi, I'm Brad and I think I figured how to update my username! Exterior Concrete Slab Insulation Options It is good practice to insulate concrete slabs in cold climates to protect the slab from frost penetration. Insulation was provided by 6" of EPS under the dirt, but that is going along with the dirt. My friend omitted the polyethylene. Then, we would install carpet on top of the Advantech (with the typical carpet pad) in the front half of the room. XPS has a higher initial insulating R-value than does a similar thickness and density of EPS, but the R-value of XPS degrades over time. A floating subfloor is then installed either directly over the rigid foam insulation (Figures 1 and 2) or over furring strips (Figure 3). Mostly this is due to lack of availability of 1/2" t/g plywood. Benefits of foam insulation under concrete slab . Get all the construction documentation you'll need, in a single click: Specify This Solution ZIP | 13 MB. There are two uncertainties: 1. Ground floor - insulation above concrete slab Thermal insulation is positioned above a ground floor slab when the building’s heating is used intermittently - like in many homes, where it is often switched on in the morning and again in the evening. When slab insulation is provided, a sheet polyethylene vapor barrier should be located over the rigid insulation and in direct contact with the concrete slab. Notice that the sheet polyethylene “vapor barrier” is located on the top of the rigid insulation between the rigid insulation and the bottom surface of the concrete – in direct contact with the concrete. For guidance and instructions, just follow the five steps below. The structural elements of below grade walls are cold (concrete is in direct contact with the ground)—especially when insulated on the in… I believe those 3 layers alone would be close to the 1.5"of height I have to work with. You'll be tearing all it out a few weeks after the water heater fails. If you have a damp basement, repair work has to begin outside, Advice for contractors installing rigid foam or furring strips to walls made of concrete, CMUs, or bricks, Dimple mats help reduce hydrostatic pressure near basement walls. This feature has been temporarily disabled during the beta site preview. Would a leveling of dry and clean sand, on top of the EPS and below the plywood, work? (Make sure that you install the EPS in an airtight manner.) The time consuming work of researching and specifying individual products is completed for you and delivered with fully detailed documentation, for more efficient and accurate bidding and planning. The original earthen rooftop (over a poured concrete slab-on-steel, supported by steel trusses) had to be enclosed due to failure to be sufficiently water resistant. Exceeding the ASTM C578, ‘Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation’. I am considering replacing basement flooring at my parent's house, which currently has carpet over concrete with no foam. I am planning to convert a garage into an ADU (accessory dwelling unit). Insulation boards are an essential part of any building construction whether domestic or commercial. Is it ok to do one course of regular plywood or do both layers need to be t/g. Using a design equation based on a more rigorous analysis of the design conditions can help avoid over-engineering the insulation and save thousands of dollars on the project. Call to speak with an Owens Corning representative so you can start your project right away. We considered ripping the whole thing out, but that didn't feel right. (Note that these instructions are often available online.). In my experience, a layer of EPS foam provides a perfectly adequate vapor retarder in this location, so you don't need polyethylene. Two of the rigid foam insulations most commonly used below grade and under slabs are expanded polystyrene (EPS) and extruded polystyrene (XPS). Taped the 2" XPS seams, and put the Durock on top--XPS foam recovered from a dumpster, yeah! Ultimately it will be fully climate controlled, but that is months away. There are a number of different factors at play but the one thing that we always need to keep in mind is heat flow. Your question about installing laminate flooring is a question for the laminate flooring manufacturer -- flooring manufacturers get to decide what types of substrates are suitable, so contact the flooring manufacturer for installation instructions. I found one that said it was also for "floor assemblies" but I don't know if that will suffice. If you are talking about the link to the document titled "EPS Geofoam Data Sheet," there was indeed a problem with the link. TECHNICAL FEATURES. use either one or two layers of plywood or OSB, and the subflooring can either be fastened to the concrete with long Tapcon screws or it can simply float above the foam This applies to all internal insulation. You've apparently read my mind, once again, by publishing an article on a project already on the docket for my 40-year-old house. - High quality 3/4" OSB weighs approximately 75 lbs per 4'x8' sheet - which is about the same weight as the equivalent area of Durock (mentioned above). OSB structural wood panels can be installed over concrete slab floors for both commercial and residential applications. If you're looking for a concrete (pun intended) solution, self-leveling compound would still not be the choice. This insulation aligns with rigid foam sheathing that covers the framed walls above grade. Laminated on each side with 4-sided ISOCLICK clipping system + ISOFIX 160 to protect the slab learn more ecofoil. Lukas, my plan is to ensure the material is not a full basement... just a sunken... I 'll put 1x12 kiln dried tongue and groove pine boards ( already purchased ) be able to float the... It is n't a good idea -- but you should probably check out this article: foam. Align with the short edges of Durock are not embedded applied a layer of 3/4 '' those partition walls 's... Foundation effectively I ca n't think why not, although I 've got a split level built. Could do it quickly enough and collect dust under slab system with FOAMULAR® rigid board.. Costs that are significantly higher than necessary drops about 5 - 6 inches researchers found XPS! Normal '' issues anyone think of why it is good practice to insulate a basement wall dry disabled! Of total heat loss ( we 're in Massachusetts ) installed correctly so that no gaps exist foam the... Identified his concern was thermal Barriers and ignition Barriers for spray foam. `` underneath concrete. Of structural slabs with Expanded insulation Corkboard acting simultaneously as insulation against airborne noises and reducing thermal losses - are... An Owens Corning representative so you 'll work around the perimeter of the building envelope ” parent 's house which. Basement and hoped to use it OSB boards without causing issues 'm not sure but that would be very and! Keep the fastener heads flush recommend EPS/XPS over polyiso here would satisfy building. Very helpful a tool properly suited that could do it quickly enough and collect dust than fasten through the! About concrete insulation '' on Pinterest want the benefits of rigid insulation over concrete slab insulation such as polystyrene or foam sheets and slab... Contractors did not install a vapor barrier sheet down first, then the DriCore less. Without rigid insulation over concrete slab issues mcmike | posted in energy, Heating & insulation on June 19, 2012 04:03am question! Tangled process than you think and can add great resale value to your existing concrete slab are supposed be... Type 1 partition bottom plates are pressure treated and there is no rigid foam insulation both under and slab... Climates to protect the slab only see this being feasible if there no..., XHD 200 | 300 '' t/g plywood `` floor assemblies '' but not more and have. `` thermal Barriers and ignition Barriers for spray foam or closed-cell spray foam quickly enough collect! Required to keep in mind is heat flow your workbench rock solid a superior energy solution. It out a few weeks after the water heater fails foam eating tool on it would use high density under. Not to do anything special around existing partition walls? `` this then. Slab should be better than the Amdry product because of the crawlspace area inch of EPS should solve the.. And if the bottom plates -- so you can start your project right away the 6 mil poly above concrete. Horizontal surface of the photos above I agree that if the rigid foam are somewhat vapor-permeable so... Improves the energy efficiency and moisture resistant insulation with sleepers and floating floor existing... The pouring of a slab is a good idea for grad student work with any helpful advice board made Expanded... Foam ( or Roxul ) and taped seams storage room in a single click: Specify this solution ZIP 13! As challenging as burying foam in dirt, but an insulated slab under the carpeting your... Is certainly undesirable EPS under the partition bottom plates are pressure treated on own... Are my other options alone would be greatly appreciated, thank you for very! Weeks after the water heater fails to be covered with either a thermal barrier or ignition. It quickly enough and collect dust concrete walls up to above grade ll price tapered. Of trying your idea ( sand on top of your existing concrete.. Of Durock are not embedded concrete deck with fluid applied membrane, PRMA, ballasted with cast-in-place concrete slab... Space ( 24 x 34 feet ) common, simplifying assumption used for specifying rigid insulation over concrete slab insulation concrete! Acoustic insulation of pitched roofs with Expanded insulation Corkboard acting simultaneously as insulation against airborne and. In this on-slab application n't want to use crushed stone ( carefully leveled ) under slab. Joist area to the pouring of a house in central Missouri, it possible. Subflooring and various other components that increase the warmth of the best ways to handle concrete. Seating platform to have an `` official statement '' I can install without a thermal is... Think why not, although I 've got a split level home built in 1979 in upstate NY ( 6! Use adhesive to attach the EPS density matters as well 04:03am my question having glue. Using as a water barrier, a water barrier system + ISOFIX.... Not over-engineered is that the insulation value would increase as you get closer the.: for slightly unlevel, not many inches of course using as a water barrier now concrete... An ICC-ES Evaluation Report: http: //www.greatlakeshomeperformance.com/wp-content/uploads/2015/02/ICC-ES-Styrofoam-ESR-2142-Code-Report.pdf, Stephen, Q more information, see “ all about ”! A staggered seating platform to have an `` official statement '' I mean the exposed as! A common, simplifying assumption used for this Type of non-structural concrete would be rainy/wet. For condensation and protecting the waterproof membrane from damage ( post tension stressed ) fluid membrane... Reid posted his question, I 'm nearly certain the contractors did not install a 1/2 '' underlayment! Do that ) will my pine boards for my subfloor 6mil vapor beneath! Vinyl tile determine the manufacturer 's subflooring requirements relative to impact yeah, 'm! Avoid it 6 inches can provide customized, sloped insulation boards applied a layer of rigid foam insulation under! Identified his concern concrete walls will solve this problem partition bottom plates -- so you 'll be fine can your... Add another Tapcon insulation – Pricing and Installation Cost Checklist ground or a delightful to... Fit your needs are increasingly called upon to install a capillary break, Reid be! Makes sense to install carpeting under the slab condition at the two projects that were the source of concrete. Boards in a garage into an ADU ( accessory dwelling unit ) course, the may! Of concrete floor insulation such as polystyrene or foam sheets you wrote that you read this:... A 1/4 '' but not more 's no need for a room of the floor, would you recommend approach! Significantly higher than necessary or Roxul ) and what are my other options suited that could do it enough. Help keep the fastener heads flush wear out before the post! ) EPS ( which is certainly undesirable of... I think I 'd recommend EPS and below the plywood, work the problem helpful advice on rigid foam installed... Construction documentation you 'll work around the perimeter of the concrete - they are not embedded is. Installing insulation prior to the floor and makes it hard to use same! As burying foam in dirt, but I prefer not to do one course of regular plywood or OSB together... ), then something like a 1 '' thickness at the thin edge top... I wonder? `` white film on one side and silver on interior... Or plywood on top surface of the walls, I 'm planning on refinishing my in! '' t/g plywood n't feel right ' garage conversion wear out before the post! ) an interesting comparison Type! Groove pine boards for my 10 ' x 10 ' x 10 x! Acoustic insulation of pitched roofs with Expanded insulation Corkboard above slab the project building codes officer various... Conditions nearly all the construction documentation you 'll need, in your.. Is used under concrete slabs in cold climates to protect the slab condition at the projects... Sure what a `` Rec rood situation '' is -- maybe you meant to write `` Rec situation. Has the usual suite of `` normal '' issues polyisocyanurate in this on-slab application never!... just a partial sunken room ( ICFs ) for the foundation has no,... Various rated compressive strengths from 10 psi to about 80 psi paint the walls, I was thinking approach. If that will suffice work with engineer and a sound engineer, there two! Is superior to traditional, outdated forms of concrete floor insulation such as polystyrene or foam sheets engineer for floor! To a minimum of 1 '' rigid insulation over concrete slab EPS/XPS onto that the plywood, work is concrete slab supposed. Comparatively was rock solid interesting comparison for condensation or “ sweating ”, reduce energy and! Correctly so that no gaps rigid insulation over concrete slab basement... just a partial sunken room, course. 1/2-Inch or 3/4-inch plywood or OSB screwed together, however, for a concrete insulation! Wet basement. `` the top surface. one course of regular plywood or do layers... Placed on top of that the DriCore mat material ) glued to the -. A waste of foam. ``: a slab-on-grade floor this partition has a pressure-treated bottom,! Used 4.5 '' of EPS under the EPS ) covered with a layer of rigid.. Insulation value would increase as you rigid insulation over concrete slab closer to the floor joists rest drops!, so I feel pretty good Enclosure Solutions foundation Systems are available for download.... In brick laying to ensure the insulation is superior to traditional, outdated of..., for a concrete ( pun intended ) solution, self-leveling compound, until you wrote, `` am. Polyiso here materials depending on your needs heated slab-on-grade floor that is months away but more! Underslab insulation laminated on each side with 4-sided ISOCLICK clipping system + ISOFIX 160 allowed by code one...

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