2 X 4 Fir Attic

The joist spacing in some attics is 24 inches.

2 x 4 fir attic. 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. Find douglas fir 2 in x 4 in dimensional lumber 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. Find 2 x 4 at lowe s today.

3 4 and 1 2 inch plywood. 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. In this case use r 13 or r 15 fiberglass insulation. There is no 4 inch thick faced fiberglass insulation in batts or rolls on the common market.

Find out what you can safely do with your space and which attic flooring can be installed. R 3 square edge rigid foam board insulation sheathing model 36l view the owens corning exterior insulation. Older homes especially those pre dating the 1950s may employ two by fours that truly are 2 inches by 4 inches. Owens corning foamular 1 2 in.

For joists spaced 24 inches oc use. The home is in portland oregon and there is limited room for insulation because the roof is framed. Two considerations will help you choose between the only two viable options for your attic. You can achieve better thermal performance in your attic by adding an additional layer of insulation.

Osb in 4 foot by 8 foot panels over existing 16 inch oc joists. Joe sobolewski posted in energy efficiency and durability on august 8 2015 12 34pm we are converting our attic to living space and i am looking for input on the best way to insulate the space. Achieving greater r values in exterior walls in exterior walls add insulating sheathing to achieve a greater r value in your wall system.