Knee walls are not found in all attics and they are not absolutely necessary.
Building walls in an attic.
If building a knee wall for storage like karl did with this project make sure to insulate that area as well.
Support and follow me.
Don t mash or compress the insulation into the space.
It needs a certain amount of loft to work properly.
When insulated and covered with drywall the walls improve the thermal envelope of an attic.
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.
Footnote 23 envelope leakage shall be determined by an approved verifier using a resnet approved testing protocol.
But they are awfully good to have.
Consult your local building code and inquire about any necessary permits before beginning any such project.
Use r 30 insulation for the ceiling and r 13 for the walls.
Staple insulation between the wall studs and ceiling joists image a.
Mark the line that the angle forms along.
Step 1 measure the attic.
Framing basics for attic knee walls along the sides of your loft or attic space.
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.