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.
Insulate attic roof or floor.
Unless in air conditioned attics insulation is typically installed on the ceiling plane not on the sloped roof assembly.
If you do need to install insulation in the roof assembly take into account some rules.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
Materials commonly used for the insulation of the roof deck include.
But the best solution is actually to insulate both the attic floor and the underside of the roof.
It s more effective and easier to install insulation on the attic floor than in the roof assembly.
But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates.
Insulating a finished attic there are two basic ways to insulate a finished attic.
Insulate the attic floor if possible.
At the same time the areas below the roof benefit from increased comfort both during the winter and the summer.
In this way you prevent the heat from the rooms below escaping to the attic rooms above.
If only the living space will be insulated wrap the insulation around the room s walls and ceiling and then continue along the floor of the non living space.
Plan to pull up the flooring and layer new insulation on top of the old.
In this case the area behind the knee wall will be uncomfortably hot or cold.
Whenever possible do insulate the attic floor underneath the subfloor and final flooring materials.