How To Insulate A Roof Without Attic

Nail 1 furring along every rafter side against the roof deck.

How to insulate a roof without attic.

Install high quality blown insulation into the ceiling. This material is thin and typically has impressive r values. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. This foil is presumably impervious to water vapor.

To install the air chutes staple them directly to the roof decking. Install rigid foam board into the ceiling. Box out light fixtures. Airspace from the soffit to the ridge by installing a continuous air chute in each rafter bay.

Staple them directly to the roof decking for better insulating roof rafters. If you put cellulose up there it will help insulate but you need a vapor barrier above the ceiling because you ll have warm ceiling air hiiting colder roof surface and condensing which will turn the cellulose into a moldy mess. Materials commonly used for the insulation of the roof deck include. 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.

To effectively ventilate your roof create a 1 in. The space between ceiling of the living space and roof must not trap moisture. 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. The right way to insulate attics and cathedral ceilings with batts using certain t.

A new type of roof sheathing now commonly installed has reflective foil on one side to reduce ir radiation into the house from the hot outer layer of the roof. Cut and insert 1 or thicker high r foam insulation sheets r 8 per inch against the furring giving a 1 or greater air path between the insulation and the roof deck under the cathedral ceiling. Lay a two by four on top temporarily compressing the insulation to a manageable. To cut blanket style insulation place the product over a piece of plywood with its paper or foil side down.

A professional can walk you through a few options that could work in these circumstances including. It must have pathways to dry out.