Insulating Attic 2x4 Rafters

Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place.

Insulating attic 2x4 rafters.

There are some unfinished crawl space areas in the corners on the upper floor. They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters. 2x4 on 24 center rafters 3. Put insulation meant for 2x4 framed walls between the joists which will be the same height as the joists then lay a perpendicular layer of attic insulation maybe r 30 on top of them.

A drywall sheet is 32 sqft. There are four roof mounted vents no ridge vent no gable vents 4. Let s say you ve 384 sqft of ceiling to cover. Hire a pro to install spray foam insulation.

There are no soffit vents 5. I would really like to get more than r 13 and the current installation is probably providing r 1 with all the missing pieces. If your attic is going to be converted into livable space then you will need to insulate the roof rafters. 2x6 on 24 center floor joists no insulation between joists 3.

Whether there is a real hazard or not depends primarily on your local climate climate zone as well as your shingle color type and shading factors. If your rafters are only 2x4 either you ve got about 400 sqft or you ve reinforcement load bearing partitions beams somewhere. Option 2 has the benefit of preventing any thermal bridging via the ceiling joists. You can use rigid foam panels or do as tom silva does with nearly all houses these days.

Shaded or north facing roof pitches would be the most susceptible but with only 2x4 rafters and likely r13 or less the roof deck runs warmer drier than if it were insulated to current code min. Two knee walls with no insulation 6.