Before insulating seal any air leaks and make roof and other necessary repairs.
Insulating your roof space.
A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling.
The technically correct approach depends on a number of factors.
Flat roof insulation always requires professional insulation and damp roofs require professional assessment before work can be carried out.
If you ve reached your target depth but still have a few bags left over keep adding the material at an even depth throughout the space until all the bags your calculations called for are empty.
If it is located in a conditioned part of the house also remember to insulate and air seal your attic access.
With a finished attic insulation must help keep the attic areas comfortable.
That means insulating the attic floor only not the walls and having vents in the roof.
Pipes water tank and loft hatch.
To get the target r value from the product you chose use the number of bags your calculations showed that you needed to insulate your attic never fewer.
Before fitting any insulation to the sides of a pitched roof space any repairs to the roof should be completed once the insulation is in place it will be harder to spot any leaks inside the roof and any leaks will soak the insulation itself.
Insulating between the joists of your loft will keep your house warmer but make the roof space above colder.
How to insulate a finished attic.