Insulating A Ventilated Attic With 2x4 Rafters

Insulating garage ceiling with 2x4 rafters but going r13 rating.

Insulating a ventilated attic with 2x4 rafters.

Used ground probe with the sledgehammer to penetrate the very hard rocky ground. Rafter vents should be placed in your attic ceiling in between the rafters at the point where your attic ceiling meets your attic floor. For the same reason insulation shouldn t touch the roof s underside. Attic insulation rafter baffle proper vents 70 pieces model 70rm view the owens corning attic insulation 179 00 179 00.

Whether you need to insulate your roof rafters will depend on what you intend to do in the space directly beneath the rafters. Owens corning raft r mate 22 1 2 in. Attempted to camera locate through each of the five roof vents with the same result. In the attic you can just lay down an extra layer of batting and gain that extra r value.

The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. Covering up the soffit vents with loose fill or batts which can happen if you stuff insulation along the eaves is a huge no no. They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters. For example if the space beneath the rafters is going to be used for a living area then you will need to insulate the roof rafters.

Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings.