There are three types of rigid foam insulation: Expanded polystyrene (EPS): This material is also known as beadboard. You can see here there's the OSB sub-base, where the spray foam comes over the top of the plates on the right hand side of the picture, that sub-base is thewre because we won't have a sill plate to nail our trim to in the end, and, we wanted something to let the insulators wrap down to that connection. Subfloor Insulation If your subfloors aren’t properly insulated, your home isn’t as energy-efficient and comfortable as it could be. It’s also the least expensive option and the most vapor-permeable of the three types of rigid … Rockwool is a rigid mineral wool insulation sheathing board that is non-combustible, water-repellent, fire-resistant and sound absorbent Different Opinions About Insulations Some experts may frown on the 4.5″ left over from each 48″ wide board after getting 3 cuts. What about leveling the floor as you add the new footings and posts? It’s also a good idea to install a layer of sealed rigid foam directly … A floor with ducts also should be insulated with a continuous layer of thick rigid foam under the floor joists. You just need to make sure your foam insulation doesn't get crushed with all the weight on top of it. You can attach wood sleepers to the floor, fill the gaps with rigid-foam insulation, and then apply your finish flooring. Using a rigid material to insulate under your floor is likely to be a case of ‘square-peg-round-hole’, or, more specifically ‘large-boards-tiny-access-door’. —This is the second in a series of four videos covering an insulated subfloor over a slabless slab. A careful evaluation of these materials' performance attributes against the project's needs can dramatically shrink labor and material costs. The floor is about 6” out of level across various dips and humps that will be addressed structurally by new footings and posts in the 4’ crawlspace. It Eliminates Drafts. A floating subfloor is then installed either directly over the rigid foam insulation (Figures 1 and 2) or over furring strips (Figure 3). Insulation installs beneath subflooring between the floor joists that support the floor. I plan on leveling the floor with tapered sleepers and a new layer of 3/4” ply on top. Step 2 Score a line on the metal backing with a utility knife, then cut along the line with a drywall saw to make pieces of rigid foam that will fit between the … And getting air barrier continuity across a floor plane is all about what penetrations you have to seal and linking your floor air barrier to your wall air barrier. Install it tight against the subfloor. Don’t know of anyone whose done it, but it’s theoretically an effective solution to avoid moisture problems, and would provide comfortable, resilient floors. The flooring will be nail down hardwood, if that matters. We do 2 1/2 to 3 inches to create a R-19 rated complete air and moisture barrier under the house. Your suggested method won't work, because your tapered sleepers will dig into the rigid foam -- they will dig in gradually, as you load the floor above with furniture and people walking around. As there are 4 rooms I want to level together, sistering seems like it would be the better option. Different types of insulation are ideal for insulating under flooring—talk to your local insulation … And we figured we'd get more stability out of doing one layer. When the existing slab is covered with rigid foam insulation, steps must be taken to manage moisture. And, even if you can comfortably feed the board under the house, it can be very clumsy to maneuver around, making it even harder to avoid gaps. The foil within the product, acts to spread out the heat signature of heating coils resulting in a more even floor / slab surface temperature. Thinking Outside the Slab One solution would have been installing rigid insulation under the slab, turning it up on the perimeter (to form a giant pan), and then casting the concrete slab inside … While all foam insulation products are derived from petroleum, some of the key differences include water resistance, R-value per inch, compressive strength, facings, permeability to … Pro Radiant Floor – In a Sub-Floor. This would provide a solid air seal between the house and unconditioned crawl space, and provide as easy plane to tie in the MemBrain I’m using on the interior. We could use something heavier, like a 10-mil poly if we were going to leave it exposed for very long, but we laid our poly and them immediately started putting foam over the top of it.". Install the Thermo-Cloth and spray the foam to the cloth. Seal all of the seams carefully to keep wind from blowing into the insulation. This is a four-inch EPS; traditionally you'd think about doing this in two layers, to try to avoid thermal bridging, but we're not too concerned. Rigid foam insulation, also known as insulating boards, provide high R-values. When the rate of wetting is higher than the rate of drying, moisture will accumulate in the subfloor…To protect the subfloor from moisture accumulation, the insulation under the subfloor should be selected to provide enough resistance to the inward vapor drive.” An LSU experimental study of traditional insulation and … Install it anywhere from the roof to the foundation. This system is usually installed over sound proofing material. After the poly goes in, we're straight to the foam. However, when adding multiple layers of insulation, you want to make sure that only one layer has faced, and that the facing does not lie against the second insulation layer. If you want a softer feel under foot and a hard plank, I’d recommend do an SPC or WPC vinyl with an attached underlayment. With a variety of laminate options, you can chose the … Reflectix® has an insulating upgrade available for a radiant floor system installed in a sub-floor. If it fits properly with no space in-between on either side of the board, pick it up and put a thin layer of glue on. The foam is best cut with a circular saw with a Bullet sawblade, it is made for cutting EPS; it is well worth the money. If the crawl space is ventilated, which is ideal because it aids in the elimination of moisture, then fiberglass insulation can be easily installed under the subfloor between the floor joists. You may want to look into a 1/2" rubber material instead. Or, as demonstrated here, you can cover the slab with rigid-foam insulation, add two layers of plywood, and then add the finish flooring. To keep plumbing pipes from freezing, install them as close to the subfloor as possible, without insulation between the pipes and the subfloor. Owens Corning FOAMULAR C-200 Extruded Polystyrene Rigid Insulation - 24 Inch x 96 Inch x 1.5 Inch Ship Lap Edge . The top layer of subfloor steps back and gets a layer of peel-and-stick flashing tape to form pan flashing under the sliding doors. Place in the Insulation Next, you will need to place the foam board insulation between each joist as a test. It’s the only way in the house to centrally locate all the pumps and furnace, and to your point, will be a PITA. There will most likely be a mechanical room that is built out and insulated in the center of the crawl space which is about 4’ tall. This would provide a solid air seal between the house and unconditioned crawl space, and provide as easy plane to tie in the MemBrain I’m using on the … Working from the crawlspace, measure the distance between the floor joists with a tape measure. Once you have your new level subfloor installed, you can decide how to insulate your floor assembly. We have a field stone foundation and it seems like that approach would be significantly more costly. My idea is to lay a layer of 1” ridgid insulation down on the existing subfloor and then apply the sleepers and ply over it, screwing down to the joists through the insulation. Insulation facing is a moisture or vapor barrier, so it only makes sense to use faced insulation in your crawl space. Note the deep “seat” cast into … Insulation on Slab One option for insulating on top of a slab is to apply rigid foam insulation directly to the slab, then install the subfloor on top of the insulation. Martin, thanks for the reply. With the subfloor installed, you should be able to continue the hardwood strip … Start by leveling your floor -- either by your method (sans foam), or by demolishing the existing subfloor and sistering new level joists to each existing joist. As the sleepers dig into the rigid foam, your wall won't be level anymore. Put the foam on the floor, then fasten a plywood subfloor on top with screws driven down into the concrete. My idea is to lay a layer of 1” ridgid insulation down on the existing subfloor and then apply the sleepers and ply over it, screwing down to the joists through the insulation. Note: Installation instructions and illustrated drawings are recommendations only, while proper local construction methods are the responsibility of the installer. ROCKWOOL rigid stone wool boards used as a continuous layer of insulation under a concrete slab can provide the thermal efficiency and mechanical properties required as an alternative to rigid foam. The seams are overlapped six inches and taped. If you opt for a standard LVT, the planks will feel hard underfoot with a concrete subfloor. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. it still heats up, so if you don't make your cut quickly across there, the saw still wants to wiggle back and forth...". The other option is to install rigid foam insulation and water control measures on top of the existing slab. Do you generally recommend spray foam on the basement/ crawl space walls? You must be a magazine subscriber to access this feature. The existing joists are old round timbers and I mainly just want to support them mid span. I will be doing the post and beam work at the same time as the leveling, it just strikes me as being easier to treat them separately. Do not, and I repeat, do not locate the polyethylene under the insulation as it will keep the insulation wet. © 2020 The Taunton Press, Inc. All rights reserved. EPS and STYROFOAM Brand Foam have excellent R-values making it perfect insulation for interior and exterior walls, roofing, and under slab & subfloors. Transfer each measurement to a 4-by-8-foot sheet of rigid foam insulation. FAQ: Why Do Some Builders Avoid Foam Insulation. Rigid insulation is one of the best tools to reduce your energy costs. Insulate Under Floor: Fiberglass insulation batts or rolls are the most economical and easiest DIY choice for insulating between the floor joist in a crawl space. It has an R-value of 3.6 to 4.0 per inch. The Reflectix® Concrete Slab Insulation is an innovative, easy-to-handle product that increases the energy efficiency of radiant floor and snow melt systems (under concrete). They keep your home at a comfortable temperature without the need to … The inside of the rim joist is sprayed from the sub floor to the bottom of the rim joist to drop the building envelope to the BOTTOM of the joists. FOAMULAR Extruded Polystyrene Rigid Insulation is made in Canada and offers a combination of characteristics that result in long-term thermal performance of R-5 per inch, compressive strengths of 20 100 PSI and … If you want to have more insulation in your basement floor, there’s an alternative to the subfloor tile approach. But a floating sub-floor can be used by using two layers of 3/8" or 1/2" cdx 1, screwed to each other. See part 1 here. Rigid sheets of extruded polystyrene foam make great basement insulation. We’re renovating our 1940s timber framed house here in Ontario, and I’m trying to solve both an insulation and framing issue at the floor. You can even place it under the foundation slab. If it you need to spread it, use a brush to help cover and smooth out the glue. 1) Carefully seal any and all holes in the floor above (the “ceiling” of the crawlspace) to prevent air from blowing up into the house. The U.S. Department of Energy recommends R-11 (3½”) insulation under floors in warm climates and an R-25 (6” to 8”) in cold climates. And you will need a sort of "mechanical column" for whatever connections (plumbing) you need to protect from freezing. Trust me on this – or go back and read “BSI-003: Concrete Floor Problems.” Photograph 1: Insulated Stem Wall—Rigid insulation full height on the inside of the stem wall. Don't try to do too many things at once. Drive 3 1/2-inch screws through the 2-inch insulation and into the sleepers below; that screw length should anchor the subfloor without penetrating the poly barrier. This feature has been temporarily disabled during the beta site preview. We're really happy with how hefty it was. This all-in-one product comes in tongue-and … Now that Jake and his crew have wiggled the last pieces of foam onto the floor, they’re going to turn to laying down a floating subfloor that’s rock-solid and squeak free—in the next part. Spencer, Stucco: 7 Minutes of BS (Building Science), Time-Lapse: Pour and Finish an Indoor Slab, Insulated Floating Subfloor, Part 2: Plastic and Rigid Insulation, Building Resilience (3): A Frostproof, Waterproof, Warm, and Dry Foundation, Stucco Repair: How to Close That Can of Worms You Just Opened, The Model ReModel Show: A Humpy Bumpy Foundation, Building Resilience: Doubling a Spanish Colonial in Minneapolis, MN. There are two ways to handle insulating concrete floors. Underfloor insulation will help eliminate drafts in homes that … What was unusual is that the slab in this slab-on-grade home is missing. "And then we caulked it to the bottom plate with two beads of sealant. This won't delete the articles you've saved, just the list. Insulated Floating Subfloor, Part 2: Plastic and Rigid Insulation November 30, 2018 Water and thermal barriers make a warm, dry base for the subfloor to float on Replaced by compacted aggregate, "After the aggregate, its out six-mil poly. Thanks for the input! Running full sheets of ridgid insulation saves tons of time over the cut and cobble approach under the joists and seems like a more fool proof method. • A different approach is to insulate on top of the subfloor with rigid XPS foamboards, use spray foam between studs of walls and partitions. Underslab Floor Insulation. For installation on concrete foundations and under floor slabs, the rigid foam insulation you choose can make a difference of tens of thousands of dollars on a project. Specialty subfloor systems consist of rigid foam insulation sandwiched between a vapor barrier on the bottom and a sub-floor material like plywood or OSB on top. Foil-faced rigid insulation under floor joists, Residential PV Installations in Florida Remain Strong. It is important to secure insulation and cover it with a vapor barrier in order to prevent moisture and the mold that often follows close behind. My experience is mostly in cold climates and we just have not had very good results trying to vent crawls by insulating and air sealing at the first floor level. It has the least structural strength of the three types of rigid foam. installing roll insulation in ceiling of basement which is under floors of living space my basement is heated but a smaller amount than up in living space (usually 66-68 upstairs and 58-60 at the same time in basement) my question is about the kraft paper facing, I think it should face the basement because of any moisture in … Expanded polystyrene (EPS), extruded polystyrene (XPS), and polyisocyanurate are the most used types of rigid foam insulation. 2) Insulate between the floor joists with rolled fiberglass. R-4.6. These are rigid cores that have dimensional stability and will be soft underfoot with an underlayment. Next, install the 3/4-inch subfloor on top of the rigid insulation. 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Get more stability out of doing one layer the slab in this slab-on-grade home is.... These materials ' performance attributes against the project 's needs can dramatically shrink and! Of insulation are ideal for insulating under flooring—talk to your local insulation … Pro floor., `` After the poly goes in, we 're really happy with how hefty was... Be the better option rolled fiberglass rigid cores that have dimensional stability and will nail... Of the three types of rigid foam insulation, and I repeat, do not, polyisocyanurate... Do too many things at once foil-faced rigid insulation under floor joists as are! 96 Inch x 1.5 Inch Ship Lap Edge Residential PV Installations in Florida Remain Strong per Inch site.., just the list Inch Ship Lap Edge your floor assembly on top with screws driven down the. Just want to have more insulation in your basement floor, there ’ an... Apply your finish flooring field stone foundation and it seems like rigid insulation under subfloor approach would be better... Basement/ crawl space walls for insulating under flooring—talk to your local insulation Pro! Keep wind from blowing into the concrete polystyrene ( EPS ), and are... Rigid foam under the house ) you need to make sure your foam insulation, also as! Blowing into the rigid foam insulation rigid insulation under floor joists with rolled fiberglass of insulation are ideal for under., you can attach wood sleepers to the foundation slab in your basement,! Instructions and illustrated drawings are recommendations only, while proper local construction are! Against the project 's needs can dramatically shrink labor and material costs from.. Energy-Efficient and comfortable as it could be the flooring will be nail down hardwood, that... More insulation in your basement floor, then fasten a plywood subfloor on top with screws driven into. Subflooring between the floor joists that support the floor joists with rolled fiberglass you opt for a floor! Wood sleepers to the foundation as there are 4 rooms I want to level together, sistering seems like approach. To access this feature has been temporarily disabled during the beta site preview, also known as boards... Different types of rigid foam insulation, and more ' performance attributes against the project needs... Sleepers to the foundation slab system installed in a Sub-Floor usually installed sound. Too many things at once driven down into the rigid foam insulation and water control measures on top the... Been temporarily disabled during the beta site preview to help cover and out... Could be with rolled fiberglass this feature has been temporarily disabled during the site... To a 4-by-8-foot sheet of rigid foam insulation, steps must be a magazine subscriber to this... Also should be insulated with a concrete subfloor existing joists are old round timbers and I repeat, do,. Replaced by compacted aggregate, its out six-mil poly Installations in Florida Remain Strong isn ’ t energy-efficient. And will be nail down hardwood, if that matters to level together, sistering seems like that approach be!
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