Given the size and complexity of the room we decided to split this insulating project into three phases.
How insulate attic bedroom.
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.
Insulate the remaining area of pitched roof and around the dormer window.
See below for a shopping list and tools.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
You can t just insulate the entire rafter bay because you ll trap moisture against the underside of the roof sheathing and cause it rot out.
Insulating a finished attic there are two basic ways to insulate a finished attic.
Additionally purchase some loose fill insulation to insulate corners and angles where the batting won t fit.
In these designs take out attic floor insulation only below the finished space from knee wall to knee wall and insulate the knee walls themselves.
Most codes require a specified minimum amount of headroom and it s tough to meet this requirement when insulating a finished attic especially since most codes require insulation equal to r 38 or more.
That becomes the thermal barrier.
Insulate across the top of flat attic.
Insulate the horizontal section of ceiling.
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.
This old house general contractor tom silva and host kevin o connor demonstrate the proper way to insulate an attic.
Blanket insulation is available as batts or rolls and is the easiest diy insulation material.
It s available in fiberglass mineral wool plastic fibers and natural fibers.
Insulate the vertical external wall and the lower section of the pitched roof as far as the beam below the window see photo.
To insulate an attic get some batting made out of mineral wool fiberglass or recycled foam.
In this case the area behind the knee wall will be uncomfortably hot or cold.
And the answer to that is if that attic is going to be a heated finished space then the insulation moves from the ceiling of the second floor up to the underside of the roof rafters.
This type of insulation.