Insulation Between Narrow Attic Joists

In an older home a typical roof rafter can range between 2 4 s to 2 8 s.

Insulation between narrow attic joists.

Uniform stud spacing is a mainstay of today s construction practices because it allows builders to use wallboard. When using fiberglass insulation the pink stuff the attic roof rafter will need to be at least 16 deep. Insulation rolls available in pre cut widths to fit between studs and joists. Cut foam board to fit in between joists.

In practical terms you can choose between mineral wool or insulation boards. How to install batten insulation when the studs are wider than 16 inches. Remove all blown in insulation 2. They come with or without a paper or foil facing that acts as a vapor barrier.

In order to create a deeper cavity for the insulation it will be necessary to attach wood framing to the existing rafters through a process called furring. Use wire insulation supports to hold attic insulation up between beams keeping your house well insulated is a good but annoying necessit. If you decide on mineral wool such as glass wool or rock wool you will need to put down a damp proof membrane. If your house doesn t already have a layer of insulation between the joists you ll need to install one before adding a layer over the joists.

1a attic access door. Use spray foam to seal the foam between the joists this will both insulate and create my air barrier for this portion of the attic. Come in continuous lengths ranging from 20 to 40 linear feet. Start in a corner away from the attic hatch and fit the roll insulation between the joists facing against the drywall.

This flexible insulation material is most often packaged in rolls that come in various thicknesses and standard widths usually 16 inches and 24 inches to fit between joists or studs in a house s framing. As for insulating below the joists an insulating laminate insulation bonded to plasterboard such as celotex pl4000 or a separate rigid pir insulation board finished with a separate sheet of plasterboard can be securely fixed to the joists to provide an internal finish to the roof. In unfinished attic spaces insulate between and over the floor joists to seal off living spaces below.