Cementitious foam insulation

Cementitious foam insulation is a cement-based thermal and acoustic insulation,[1] with an R-value similar to that of fiberglass.[2] It is installed as a foam with a consistency like shaving cream,[2] or as pre-cast slabs.[3] The current cost is similar to that of polyurethane foams.[2]

Unlike many foam-in-place polyurethane foams, it is nonflammable and non-toxic.[2] As it is water-based, it offgasses water vapour while curing, requiring ventilation and in some cases a dehumidifier. It cures more slowly than organic foams. However, it does not offgas volatile organic compounds as many organic foams do. Like cement, it is water-soluble until cured, but after curing it is water-resistant,[1] but water-permeable.[4]

It does not expand on setting, but may shrink slightly in open cavities. Structurally, it does not resemble concrete; at the low densities that make it well-insulating, it is quite fragile. It can be crumbled away to re-expose wiring or pipes, making a pile of grey powder. Also unlike concrete, it is quite lightweight.[1]

It is not a new product, having been around for some decades, but exclusive rights to an established cementitious foam product have recently been purchased by a company that has been giving it more publicity.[1]

References
  1. http://www.myhomescience.com/cementitious-foam-insulation-gets-second-look/
  2. Department of Energy. "Insulation Materials". Retrieved 2016-08-17.
  3. http://www.induceramic.com/industrial-ceramic-product/ceramic-foam-insulation/foam-cement-insulation-board
  4. "Ruling No. 10-05-1241 Application No. B-2009-42". Ontario Ministry of Municipal Affairs and Housing, Building Code Commission.
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