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Loose-fill insulation comes in loose fibers or pellets and should be blown into a space. Rigid foam is more expensive than fiber, but generally has a higher R-value per unit of thickness. Foam-in-place insulation can be blown into small areas to control air leaks, like those around windows, or can be used to insulate an entire house. [33]
Bulk insulators block conductive heat transfer and convective flow either into or out of a building. Air is a very poor conductor of heat and therefore makes a good insulator. Insulation to resist conductive heat transfer uses air spaces between fibers, inside foam or plastic bubbles and in building cavities like the attic.
ICF construction can allow up to 60% smaller heating and cooling units to service the same floor area, which can cut the cost of the final house by an estimated $0.75 per square foot. So, the estimated net extra cost can be as much as $0.25 to $3.25.
While open-cell foams typically have R-values of 3 to 4 per inch (RSI-0.53 to RSI-0.70 per inch), closed-cell foams can attain R-values of 5 to 8 per inch (RSI-0.88 to RSI-1.41 per inch). This is important if space is limited, because it allows a thinner layer of insulation to be used.
Nisson & Dutt (1985) suggest that a house might be described as "superinsulated" if the cost of space heating is lower than that of water heating. [ 1 ] Besides the meaning mentioned above of high level of insulation, the terms superinsulation and superinsulating materials are in use for high R/inch insulation materials like vacuum insulation ...
The air-trapping property is also the insulation principle employed by homeothermic animals to stay warm, for example down feathers, and insulating hair such as natural sheep's wool. In both cases the primary insulating material is air, and the polymer used for trapping the air is natural keratin protein.
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