How To Install Insulation In Roof Rafters

The insulation should be installed with the paper facing out and attached using staples.

How to install insulation in roof rafters.

Don a long sleeved shirt safety glasses gloves and a dust mask to prevent irritating fiberglass from reacting with. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. With a warm roof the usual process is to split the insulation into two layers. Attach baffles to the bottom of the roof sheathing the plywood or solid wood strips onto which roofing material.

Staple the foil to the underside of the rafter ensuring as you roll out the material you staple to all the rafters. If you have a solid floor covering the roof rafters use the claw end of a hammer to pull the floor up in several locations and blow the insulation under the boards. Use 3 8 inch heavy duty staples every six inches. If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters.

Unwrap a roll of. Replace the floorboards and then spray more insulation on top of it. For rolled insulation place it between roof rafters. The fiberglass insulation comes in rolls that are 16 to 24 inches wide.

It allows insulation to be installed in a watertight roof either after the roof covering has been fixed on a new build or without disturbing an otherwise sound existing roof covering as part of a renovation. 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. Box out light fixtures. The rolls have a number of 8 foot pieces rolled onto one roll.

Attach the insulation to the rafter scab board by the paper flange so as not to compress the fiberglass. Unroll the material and start on one side of the loft. Water is insulation s enemy. The paper will fold over the rafter framing thereby allowing for attachment with staples.

Staple it to the rafters or scabbed on boards with a staple gun so that the paper backing is toward the interior of the room to act as a vapor barrier. How to install rafter insulation 1. Modern u value targets mean installing insulation between rafters only is rarely a viable option.