Another reason you wouldn t want to insulate the ceiling rafters is that you can wind up with ice dam issues.
Insulate attic floor and ceiling.
A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling.
At the same time the areas below the roof benefit from increased comfort both during the winter and the summer.
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.
That means insulating the attic floor only not the walls and having vents in the roof.
See below for a shopping list and tools.
This type of ceiling is insulated in the same manner that you would insulate a standard attic space.
The attic floor which is the ceiling of the living space below often already is insulated.
With a finished attic insulation must help keep the attic areas comfortable.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
This old house general contractor tom silva and host kevin o connor demonstrate the proper way to insulate an attic.
As mentioned earlier attic ceiling insulation is easier and less expensive than roof insulation.
Since the ceiling in the attic is too low to make it into a living space you should only insulate the floor.
Insulating the attic floor.
Start with the attic floor.
But the best solution is actually to insulate both the attic floor and the underside of the roof.
Stop using your attic for storage.
If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned space.
If you decided to use a rigid foam board to help insulate your cathedral ceiling you would install the board on top of the roof sheathing and underneath the plywood at the top of the roof.
Cellulose and other fibrous materials are good and inexpensive choices.
Installing or adding insulation to the ceiling plane is rather straighforward.
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.
And you may use very different insulation materials.
Attic ceiling plane insulation.
If it is and you plan to provide heating and cooling to the finished attic space you need to remove.
In this way you prevent the heat from the rooms below escaping to the attic rooms above.
In unfinished attic spaces insulate between and over the floor joists to seal off living spaces below.
1a attic access door.