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Add the right kind of insulation when adding additional insulation you do not have to use the same type of insulation that currently exists in your attic.
How thick should insulation be in an attic. It is not uncommon to see 15 to 20 of insulation in a well insulated attic. They range from around 1 to 3 inches in thickness and can be used in multiple applications ranging from walls to attics. The thicker the better. Inspecting your attic insulation.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. The insulation in your attic should be at least 12 thick. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.
Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. So if the ideal r value for your home is r 40 your contractor may only need to spray five inches of foam insulation. For loose fill cellulose this translates to a total depth ranging from 8 inches.
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