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Fiberglass batts [9] 2.54: 1 0.55–0.76: 3.1–4.3: 22–30 Cotton batts (blue jean insulation) [10] [11] 2.54: 1 0.65: 3.7: 26 Molded expanded polystyrene (EPS) low-density 2.54: 1 0.65: 3.85: 26 Sheep's wool batt [12] 2.54: 1 0.65: 3.7: 26 Icynene spray [7] [13] 2.54: 1 0.63: 3.6: 25 Open-cell polyurethane spray foam 2.54: 1 0.63: 3.6: 25 ...
Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value (in K⋅m 2 /W) is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]
Made from molten glass, usually with 20% to 30% recycled industrial waste and post-consumer content. [16] Nonflammable, except for the facing (if present). Sometimes, the manufacturer modifies the facing so that it is fire-resistant. Some fiberglass is unfaced, some is paper-faced with a thin layer of asphalt, and some is foil-faced.
For example, in the US the insulation standard for attics, is recommended to be at least R-38 US units, (equivalent to R-6.7 or a U value of 0.15 in SI units). [5] The equivalent standard in the UK are technically comparable, the approved document L would normally require an average U value over the roof area of 0.11 to 0.18 depending on the ...
A multi-family residential building under construction with rigid panel exterior insulating sheathing. Rigid panel insulation, also referred to as continuous insulation, [1] can be made from foam plastics such as polyurethane (PUR), polyisocyanurate (PIR), and polystyrene, or from fibrous materials such as fiberglass, rock and slag wool.
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