Insulating Attic 2x4 Rafters

2x6 on 24 center floor joists no insulation between joists 3.

Insulating attic 2x4 rafters. Option 2 has the benefit of preventing any thermal bridging via the ceiling joists. Hire a pro to install spray foam insulation. 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. There are no soffit vents 5.

There are some unfinished crawl space areas in the corners on the upper floor. 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. 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.

I added insulation to my attic rafters and plugged the space between the outdoors and my attic with insulation. It lowered my heating bill by 150 month but i ve seen some information that i may have made a mistake by cutting off the airflow in my attic. 2x4 on 24 center rafters 3. Let s say you ve 384 sqft of ceiling to cover.

There are four roof mounted vents no ridge vent no gable vents 4. You can use rigid foam panels or do as tom silva does with nearly all houses these days. A drywall sheet is 32 sqft. Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place.

If your rafters are only 2x4 either you ve got about 400 sqft or you ve reinforcement load bearing partitions beams somewhere. If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor.