Insulation board for interior walls provides soundproofing, moisture control and a deterrent to insects; it also increases the R-value rating of a home. Since the 1940s, technology has been developing insulation board that is fire resistant and substantial enough for load-bearing walls. Homeowners concerned about saving energy and decreasing pollutants in the air began seeing even greater options in the 1960s with improved indoor insulation board.
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Mineral Insulation Board
Mineral insulation board that is noncombustible and fibre-free provides flexibility in the option of insulating interior walls and ceilings. Ecologically manufactured for use in green building applications, the material consists of cement, calcium hydroxide, silicon dioxide and natural protein. The surface is durable enough to plaster, paint or paper, without the use of wall board.
Glass-Fiber-Reinforced Polyisocyanurate Foam
Products that combine insulation and a finished interior are available. Made of glass-fibre-reinforced polyisocyanurate foam, one side is lined with embossed white acrylic-coated aluminium while the other side has smooth aluminium covering. This manufacturing process creates a closed cell foam. Used in conjunction with acrylic facers, this interior board offers thermal efficiency, resists damage, is washable and is aesthetic appealing. Some boards offer as much as a 2" foam thickness that delivers a 13.0 R-value.
Semi-permeable Foam Insulation
Load bearing brick masonry buildings are known for longevity but most experience a huge amount of energy loss. Interior insulation retrofits decrease the dampness and cold air associated with ageing brick or stone. Semi-permeable foam is a practical solution to preventing moisture build-up, especially in cold climates. Water vapour is an underlying cause of moisture related problems and semi-permeable foam insulation forces drying to occur inward.
Other Interior Insulation Boards
Three materials are commonly used for foam insulation boards. Moulded Expanded polystyrene (MEPS), extruded expanded polystyrene (XEPS) or polyurethane. Depending on the R-value required and the amount of money available, the density of boards may vary. MEPS wall insulation boards have a R-value from 3.8 to 4.4 per inch of thickness while XEPS boards usually measure R-5 per inch. Polyurethane can deliver an R-value between R-7 and R-8 per inch but has a history of losing R-value over time.
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