2 X 4 Fir Attic

To make the job easier use a circular saw to cut the plywood sheet first into 2 2 8 strips which will be much easier to handle.

2 x 4 fir attic.

Insulation for attic conversion with 2 4 framing. There is no 4 inch thick faced fiberglass insulation in batts or rolls on the common market. Older homes especially those pre dating the 1950s may employ two by fours that truly are 2 inches by 4 inches. Osb in 4 foot by 8 foot panels over existing 16 inch oc joists.

Maneuvering heavy 4 x 8 sheets of plywood or osb oriented strand board up to an unfinished attic is sometimes like trying to fit a square peg into a round hole. In this case use r 13 or r 15 fiberglass insulation. Two considerations will help you choose between the only two viable options for your attic. Find 2 x 4 at lowe s today.

Commonly used and inexpensive but fibers can irritate lungs and skin though less so than in years past thanks to better manufacturing and it s less effective at blocking airflow than other materials. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Achieving greater r values in exterior walls in exterior walls add insulating sheathing to achieve a greater r value in your wall system. 3 4 and 1 2 inch plywood.

R 3 square edge rigid foam board insulation sheathing model 36l view the owens corning exterior insulation. Recycled glass or sand that s melted and spun into fibers bottom line. The joist spacing in some attics is 24 inches. The home is in portland oregon and there is limited room for insulation because the roof is framed.

Joist spacing and attic use. Owens corning foamular 1 2 in. Find douglas fir 2 in x 4 in dimensional lumber at lowe s today.