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I am wondering about whether it may be okay to use perlite as insulation under a basement slab. I am planning a Passive House and under the current plan, I would use 4 inches EPS. According to passive house, the EPS would also be under the footings. I am a little concerned about the structural stability of EPS under the concrete footings. I am considering using perlite granules (R-2.7/in ...
The use of perlite under concrete slabs is discussed in my article, Building a Foam-Free House. This method is experimental. It is untrue that using perlite under a slab is "easier" than using rigid foam. It is also untrue that perlite "has better R-value." If you use rigid foam -- a method that is common and easy -- you can choose any R-value ...
"Perlite conforming to ASTM C549, and provided in easy-to-install, lightweight bags (either plastic or paper) may be used as insulation below concrete floors." The image below is a table showing the compressive strength of a variety of perlite concrete mixes.
Lastly, has anyone used loose fill perlite for attic insulation. Climate conditions are north midwest with an average outside humidity of 72% and an indoor humidity set at 50%. Reg D temp is 90 and 2 fahrenheit. Lastly, in the alternative, is there any experience with foam applied to the outside of OSB on exterrior walls with no wall cavity ...
According to C.P. Chemical, the foam won’t melt, and won’t support combustion. Its combustion byproducts are “significantly less toxic” than those of white pine. Like polyurethane insulation, Tripolymer is a two-part compound. Unlike polyurethane foams, Tripolymer 105 does not expand as it’s applied. It solidifies within 30 seconds ...
Choose the Right Insulation for Each Part of the House UPDATED 4/12/2013. ABOUT INSULATING ROOFS, WALLS, AND FLOORS It’s not unusual for a house to have three or four types of insulation: spray foam, loose fill, rigid foam, and/or batts. Each type has multiple uses, but most also have limitations on where they can be used.
The slab with both live load and dead load is 100 psf or about 0.7 psi. Bearing capacity of perlite is well above those loadings. Our slab was 2300 sf inside the footings and the perlite cost came in at $1.36/sf. We used a taped/ sealed 6 mil poly ground cover, and a 25 mil reinforced scrim top cover.
I am preparing to install a stainless steel flexible liner inside an unlined masonry chimney on an exterior wall to provide draft for a wood stove. Every internet website selling the liners stresses the need for an insulation wrap to keep the vapors warm, improve the draft, and diminish creasote buildup. This has also been emphysized at GBA for similar reasons on multiple occasions. The ...
According to the Perlite Institute (see attached), it comes in 4 cubic ft paper bags which are laid flat and compacted, creating an 8” lift with R-value of 25. The installation detail shows that the vapor barrier can be installed either above or below the perlite. Recent posts on GBA suggest the vapor barrier should ideally be placed above ...
Here are the most important points from this paper: 1. Neither of the two phenolic foam board insulations mentioned in the Dow white paper is Kingspan’s Kooltherm. 2. The listed R-value for the phenolic foam boards is R-6.7 to R-7.5 per inch; Kooltherm insulation is R-8+ per inch.