In really cold climates a third layer of insulation either un faced r 30 or blown in cellulose can be installed on top of the first two layers.
Double insulate attic.
Improper installation can damage attic framing promote mold.
For diy attic insulation you ve got two choices.
Once you ve decided which type is best for you examine the material options and prices to home in on the right product.
In finished attic rooms with or without dormer insulate 2a between the studs of knee walls 2b between the studs and rafters of exterior walls and roof 2c and ceilings with cold spaces above.
2d extend insulation into joist space to reduce air flows.
Most attics are insulated with blown in loose cellulose r 3 5 per inch blown in loose fiberglass r 2 5 per inch or fiberglass batts r 3 2 per inch.
Insulating an unfinished attic is a simple diy project.
In attic spaces an additional layer of un faced insulation usually r 30 can be installed on top of the insulation that is between the ceiling joists for an added layer of protection.
Loose fill or batt the common term for blanket insulation.
An unfinished attic is an attic that is not considered part of the living space.
The attic floor which is the ceiling of the living space below often already is insulated.
Insulating an unfinished attic can be a simple diy project.
If it is and you plan to provide heating and cooling to the finished attic space you need to remove.
Cellulose is recycled newsprint treated with a fire.
A tip for doubling up on attic insulation.
So it s time to pay close attention to what s happening up there.
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Both can be added to uninsulated attics or layered over existing material.