Insulating A Ventilated Attic With 2x4 Rafters

Attic insulation rafter baffle proper vents 70 pieces model 70rm view the owens corning attic insulation 179 00 179 00.

Insulating a ventilated attic with 2x4 rafters.

Owens corning raft r mate 22 1 2 in. Used ground probe with the sledgehammer to penetrate the very hard rocky ground. For the same reason insulation shouldn t touch the roof s underside. They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters.

I would really like to get more than r 13 and the current installation is probably providing r 1 with all the missing pieces. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. In the attic you can just lay down an extra layer of batting and gain that extra r value. 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.

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. To install the rafter vents staple them directly to the roof decking. Attempted to camera locate through each of the five roof vents with the same result. Insulating garage ceiling with 2x4 rafters but going r13 rating.

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