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Monday, October 04, 2004

Foam and Foam Board Insulation

Foam and Foam Board Insulation: "Synthetic foam insulation products are commonly used in buildings. Foam insulation has a relatively high R-value (resistance to heat flow) compared to other types of insulation.
Many variables affect the final R-value of foam insulation: the initial density of the foam; the blowing gas used (CFC, HCFC, CO2, air, or a number of other gases); how the panels are handled (dents and chips in the panel adversely effect the R-value); the type of facing (if any) used, and the conditions under which the panels are installed.
There are several methods of installing foam insulation. You can spray it as a chemical mixture from a small aerosol container, or apply it in bulk from a pressure sprayer. As the chemical mixture cures, it fills and seals odd-shaped spaces and wall stud cavities. You can also apply the foam as a liquid that flows over obstructions before it expands and cures. Finally, you can pour solidified plastic foam as loose beads into concrete blocks or install it as rigid panels that can be cut to size. "

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