Insulating A Ventilated Attic With 2x4 Rafters

Owens corning raft r mate 22 1 2 in.

Insulating a ventilated attic with 2x4 rafters.

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. Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings. 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. Set your store to see local availability add to cart. To install the rafter vents staple them directly to the roof decking. I would really like to get more than r 13 and the current installation is probably providing r 1 with all the missing pieces.

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. Rafter vents should be placed in your attic ceiling in between the rafters at the point where your attic ceiling meets your attic floor. Insulating garage ceiling with 2x4 rafters but going r13 rating. Whether you need to insulate your roof rafters will depend on what you intend to do in the space directly beneath the 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.