Then blow another layer on top of the roof rafters.
How to insulate a attic roof.
Insulating the roof is a priority if the ceilings of your home happen to be part of the roof deck as is the case with cathedral ceilings.
How to insulate a finished attic.
If your attic is often used or perhaps you plan to convert it in the future you will need to insulate the inner surfaces of the roof.
Insulating the pitched roof.
Water is insulation s enemy.
That means insulating the attic floor only not the walls and having vents in the roof.
Materials commonly used for the insulation of the roof deck include.
Before insulating seal any air leaks and make roof and other necessary repairs.
To meet all three goals insulating your finished attic ventilating the roof and maximizing headroom use a combination of dense batt insulation rigid foam sheeting and air chutes.
You may also insulate your roof to help regulate the temperature in an attic that is a part of your living space.
If you re finishing your attic insulating it to the proper r value can cause a dramatic loss of headroom if you limit yourself to fiberglass batts.
The technically correct approach depends on a number of factors.
A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling.
Insulate your attic to keep your heating and cooling from going through the roof along with your monthly budget.
Whether or not there is an inner roof lining and the total thickness of the roof structure.
If you have a solid floor covering the roof rafters use the claw end of a hammer to pull the floor up in several locations and blow the insulation under the boards.
Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be.
Box out light fixtures.
By steven fox photo.
With a finished attic insulation must help keep the attic areas comfortable.
If it is located in a conditioned part of the house also remember to insulate and air seal your attic access.