2 X 4 Fir Attic

Find out what you can safely do with your space and which attic flooring can be installed.

2 x 4 fir attic. 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. Older homes especially those pre dating the 1950s may employ two by fours that truly are 2 inches by 4 inches. The home is in portland oregon and there is limited room for insulation because the roof is framed. Joist spacing and attic use.

Find 2 x 4 at lowe s today. For joists spaced 24 inches oc use. Find douglas fir 2 in x 4 in dimensional lumber at lowe s today. Recycled glass or sand that s melted and spun into fibers bottom line.

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. Owens corning foamular 1 2 in. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Two considerations will help you choose between the only two viable options for your attic.

R 3 square edge rigid foam board insulation sheathing model 36l view the owens corning exterior insulation. 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. Osb in 4 foot by 8 foot panels over existing 16 inch oc joists.

3 4 and 1 2 inch plywood. In this case use r 13 or r 15 fiberglass insulation. Achieving greater r values in exterior walls in exterior walls add insulating sheathing to achieve a greater r value in your wall system.