Cementitious foam-a nonflammable, extremely stable insulation-is manufactured from magnesium oxide derived from seawater. When dry, it is inert and should not have any impression on chemically delicate individuals. Another sort of foam insulation, polyisocyanurate, is a inflexible foam good for exterior retrofitting, usually on roofs, with an R-value of 6 to 7.5 per inch. “Polyiso,” as it’s known as, was formerly created with ozone-depleting HCFCs as blowing brokers, however the new “inexperienced polyiso” makes use of hydrocarbons that don’t emit greenhouse gases. Foam insulation stops air leaks and can be used the place different insulations cannot, corresponding to in foundations. However, the presence of polyurethane, a plastic, means spray foam insulation isn’t all pure.
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Cellulose insulation consists of eighty to ninety p.c post-shopper recycled newsprint, cardboard and paperboard. It’s generally applied by making it right into a moist newspaper mush and spraying it into open wall cavities; typically it is shredded dry and utilized in attics as unfastened fill. Like cotton, cellulose insulation is often handled with boric acid. Cotton insulation is produced from remnants that denim producers and different textile crops otherwise would have thrown away. It’s sold both as loose fill or in batts, like fiberglass, however with out chemical or respiratory irritants. Like different textile products, cotton insulation is treated with boric acid as a fireplace retardant, pest repellent and an antifungal agent. Unlike most pest repellents and antifungals, boric acid is fairly unhazardous.
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