It needs a certain amount of loft to work properly.
Building walls in an attic.
If your attic space is framed with rafters and is unfinished it has a triangular shape.
To build your walls to the correct length measure the angle of the rafter by laying a piece of 2x4 inch lumber against the side of the rafter in a vertical position.
At the bottom points of the triangles the rafters meet the top plates of the exterior walls.
Use r 30 insulation for the ceiling and r 13 for the walls.
Support and follow me.
Framing basics for attic knee walls along the sides of your loft or attic space.
Mark the line that the angle forms along.
If building a knee wall for storage like karl did with this project make sure to insulate that area as well.
Step 1 measure the attic.
Consult your local building code and inquire about any necessary permits before beginning any such project.
Footnote 12 building envelope assemblies including exterior walls and unvented attic assemblies where used shall comply with the relevant vapor retarder provisions of the 2015 international residential code irc.
Staple insulation between the wall studs and ceiling joists image a.
But they are awfully good to have.
Knee walls are not found in all attics and they are not absolutely necessary.
Knee walls are short wood framed walls that install between the ceiling joists and rafters in an attic.