Polyurethane Foam Insulation for Waterproof Insulation
One very good type of insulation material is urethane, or more popularly known
as polyurethane. Used as both spray insulation and in sheet form, polyurethane
has high resistance to heat and is considerably more waterproof as compared to
other insulation materials. Available at most home improvement supply stores,
polyurethane is mostly used for insulation of wall cavities, gaps and cracks.
Features
Polyurethane originates from a combination of simple organic chemicals like
isocyanate and polyether. When these two are combined, a polymer-like compound
is formed to which a catalyst can be added and sufficient pressure is applied.
The result is polyurethane, a foam-like substance that is highly fire-resistant
and expands on curing.
Polyurethane foam insulation is considered to be the best form of insulation
used for small home insulation projects. Its flexible constitution and structure
makes it easy to use without problems for either homeowners or handymen. In
addition, polyurethane foam insulation is also available at very reasonable
prices from most insulation material suppliers.
Using Spray Insulation
Spray insulation is a method in which the polyurethane foam is sprayed into the
finished or unfinished wall cavities of the house. This type of insulation
eliminates the need to tear down the walls. Smaller gaps, cracks or holes can
also be easily filled using this technique. Spray insulation is known to expand
when curing, enabling it to build resistance to air infiltration, and the
chemicals used also gives the material fire resistance properties. Special
equipment is often used by the insulation contractor in mixing chemicals with
specific ratios, then spraying or injecting them into the wall cavities.
Disadvantages
While polyurethane foam spray insulation is highly fire-resistant, the spraying
process could damage the walls, resulting in cracks that could lead to moisture
build up and vapor condensation. It is also known that the insulation could lose
the trapped gases within the foam, thus reducing its insulation efficiency. In
these cases, it is always best to consult a professional insulation contractor
to provide solutions.
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