2013年12月7日 · I stopped by my local HD for more supplies and was surprised to see rolls of "radiant barrier" bubble wrap on the shelf. Lowes and online vendors sell products with similar claims. For example, here are the benefits promised by a leading vendor: "An easy-to-install double reflective, double bubble insulation R-values range from R-3.7 to R-21 depending on …

2017年12月16日 · Correct me if I'm wrong, but shouldn't the foil facing on polyiso face the interior in climate zone 5 to help retain heat? It will be used on basement rim joists. The heating season is obviously longer than the cooling season. Furthermore, should I leave an air gap between the foam and the wood or should I place the foam directly against the wood before spray foaming …

2017年11月15日 · You want real insulation -- insulation with an R-value. One option to consider is to include a layer of rigid foam in your assembly. If you go that route, you can choose to purchase foil-faced rigid foam -- either foil-faced EPS or foil-faced polyiso -- for the slight boost in R-value associated with the radiant barrier facing.

2016年3月29日 · The aluminum facing can act as a useful radiant barrier, but only if it faces an air space. In your case, the outermost layer of rigid foam should have the aluminum side facing out, toward the air space. A 3/4-inch air space with a radiant barrier on one side will add about R-1 or R-2 to the R-value of your wall assembly -- not much, but something.

2020年2月3日 · The idea is to place bubble insulation with a reflective coating down on the underside of my roof (in the attic) and then add closed cell spray foam over that. The choice in using a reflective bubble insulation is to obtain the necessary ‘air gap’ required for a properly functioning radiant barrier.

2024年12月10日 · I want to use Polyiso foam board as insulation for both the sidewalls and roof. My question is should I put the foam board against the metal or should I leave an air gap between the foam board and the exterior metal. It’s worth mentioning the foam board has a reflective surface on it and if I left an air gap I could use it as a radiant barrier.

Rigid foam insulation is a high embodied energy, high global warming potential material that is far less vapor permeable than traditional building materials. It's becoming commonly used exterior to OSB to keep the moisture-vulnerable sheathing above the winter dew point (the "warm sheathing" approach) to minimize condensation potential.

2018年4月17日 · It is not performing like a reflective insulation because there are no significant reflective air spaces.” Mike Boulding is the president of TVM Building Products, the manufacturer of rFoil. “In our case we claim 57% reflectivity, which means that the product will reflect 57% of the radiant component of heat transfer,” says Boulding.

2014年3月21日 · The R-value of reflective insulation is not measured by the inch. The R-value of reflective insulation is measured within a system. Reflective insulation reduces the transfer of heat across air space. The R-value of reflective insulation and mass insulation is based on the same fundamental equation - The ability to stop heat transfer.

2010年8月23日 · Infrared Images of Bubble-Foil Wrap Duct Insulation I was recently in an attic of a recent-construction multifamily building; I noticed that they had used two layers of bubble-foil wrap duct insulation on the duct trunks, and a fiberglass wrap on the runouts. Both of these ducts were sheet metal, but with some insulated flex at runouts.