Q. Of course, the EPS density matters as well. What if we did a 6mil vapor barrier sheet down first, then the dricore? Covering foam in a crawl space with the less stringent barrier (an ignition barrier) is only possible if it meets the following criteria: if the crawl space is only accessed for repairs or maintenance; if there is no easy access to the space; and if it isn’t used for storage. I know its an option to use one course and screw into the slab, but I prefer not to do that. Saint-Gobain Construction Products UK Limited trading as Celotex, Registered in England. That will be after air-sealing the rim joist area to the best of my ability. So beneath the logs, I put sill seal directly on the slab, and then I put two full two-inch-by-ten-inch black locust boards (so four inches thick) between the sill seal and logs. Would I need to do anything special around existing partition walls?". "Would a foam subtractive method be totally crazy, I wonder?". Lightweight, rigid polyisocyanurate (PIR) foam insulation boards, such as those manufactured by Celotex, are among the most thermally efficient, commonly available insulation materials. Mostly this is due to lack of availability of 1/2" t/g plywood. When Reid posted his question, I wasn't sure what his concern was. I'd rather do the floating floor than fasten through to the concrete. I'm not sure I understand you question about the partitions. "Do I need to leave a gap around the perimeter of the rigid foam and framing or should this be snug?". There would be two exterior doors that would need to be installed as well - one into the garage and another that leads to the outside. Where insulation is positioned above the slab, the slab and DPM can be installed either way round. Thanks, This won't delete the articles you've saved, just the list. While Celotex PIR boards have a good compressive strength, they cannot be laid below a raft slab and take the structural load of the building. This will be virgin material as it is manufactured custom for the job, but it would work, and probably be significantly cheaper than self-leveling compound. Is your basement a damp hole in the ground or a delightful place to retreat and tinker at your workbench? Hi Peter. I'm considering the same approach. ISOVER: White House Industrial Estate, Runcorn, Cheshire, WA7 3DP. Honestly I think I'd be mildly concerned about the bottom plates on the partition walls. slab over the insulation. Another idea is to lay a dimple membrane like DMX/Delta-FL, then something like a 1" rigid EPS/XPS onto that. Where the heating is likely to be turned on and off, such as in new-build domestic properties, and a faster thermal response is required, the ‘floating floor’ arrangement of insulation above the slab can be more appropriate. Or should I just stick with the original plan and use a special glue that will also serve as a water barrier? This is the method a friend and I did in his basement. An added bonus would be that the insulation value would increase as you get closer to the primary exterior wall. Either way, thank you! I'm currently building a home in North Louisiana (Climate Zone 3). I'm not sure what you mean by "the top surface." I appreciate the tips and the photos. For a deep dive into the issue, I suggest that you read this article: "Foam Under Footings.". I ask because I am now looking to create a laundry space in the basement and hoped to use the same subfloor system. We have a slab on grade foundation (post tension stressed). If there is no rigid foam under the logs (! Lukas, The durability and dimensional stability of stone wool means that ROCKWOOL insulation stays firmly in place without support, and maintains optimal performance over time. Probably can go over that by a 1/4" but not more. Concrete slab insulation is important for energy savings and home comfort. Bradley, did you try tongue and groove? The two layers of plywood and sand would be floating on top of the insulation. Installing Rigid Foam Above a Concrete Slab - GreenBuildingAdvisor edit: for slightly unlevel, not many inches of course. Slabmate is the new under slab insulation solution for slab on ground construction.Slabmate has been designed to create a thermal barrier adding to the total insulation of the project.. Environmentally friendly, Slabmate is made here in Australia for both commercial and residential projects.Slabmate is lightweight, safe and easy to install and will maintain its R value for the life the building. TECH Slab MT 2.2 is the semi-rigid stone mineral wool slab for the insulation of industry tanks and vessels, exhaust ducts and stacks with a maximum service temperature of up to 560 °C. Installing concrete slab insulation is a great way to save on energy usage, adds extra comfort and warmth, and increases the value of your home so that you have a higher resale value, or a higher value when refinancing or getting a loan. In the rear half, we would build the stage/riser platform on top of the Advantech. I suspect it was installed to provide sound isolation btw the floors. appreciate the reference to the other article - very helpful. Lots of issues here. But you should probably check out this article: "Foam Under Footings." A. That article includes lots of technical information and links to references discussing the bearing capacity of various types of rigid foam. If the insulation is going below the slab, the damp proof membrane (DPM) is laid next, followed by the insulation, a polythene separating layer, and the concrete slab.
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