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Using Polyurethane insulation for waterproofing

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 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 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 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.