The Disadvantages of Spray Polyurethane Foam Roofing Systems eHow

The Disadvantages of Spray Polyurethane Foam Roofing Systems eHow

Suitability

Spray foam is not suitable for every type of roofing project. There are some roofs where it is ineffective, for instance: some roof materials may not allow the foam to bind properly, so another option is needed. Roofs in rainy climates may be devised so that water easily pools at certain places in the roof; foam should not be installed on these rooftops since the roof is weaker from the constant presence of water.

Application

Applying the spray foam is a skill that can easily be done improperly. If the foam is too thick — it should be about an inch thick, depending on the type — it cannot insulate or create the proper amount of structural strength. If it is too thin, the foam will eventually develop stress fractures and lose its ability to bond to the roof.

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