Spray foam insulation is a popular choice for many homeowners, but it does come with some drawbacks. Mold growth is a common issue with spray foam insulation, and it can have an unpleasant smell. It is also more expensive than fiberglass insulation, and applying it correctly can be challenging. Additionally, it can cause termite damage and cover important areas that require ventilation.
When deciding to install spray foam insulation, it is essential to hire a reputable contractor. Open-cell foam insulation can achieve an STC rating of 40 to 50, while mineral wool block insulation can reach an STC rating of 50. Compared to spray foam insulation, fiberglass is less effective, particularly in extreme cold conditions. Open-cell foam insulation is not as strong an insulator as its closed-cell counterpart, with almost half the R-value, but it is a more affordable alternative to closed-cell insulation.
Before spraying any insulation, moisture issues need to be addressed and sealed to prevent mold from forming. If moisture from inside the roof penetrates the insulation, problems and damage to the roof are possible. At the Q&A forum, Nick from Louisiana asked why these icicles appeared after sprinkling foam on the bottom of his roof. If your home or business requires effective insulation that is worth investing in, spray foam is your best option.
However, if you have too much spray foam insulation, it can cover important areas that require ventilation and cause other issues in your home.
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