Knee walls are short usually wooden walls installed around the sides of an attic where the rafters meet the floor.
Attic knee wall framing.
The knee wall in an attic drops down from the rafter to hide the pointed angle where the rafter meets the attic floor and to make the attic feel a bit more like a regular room.
In most instances they are no taller than 3 feet but some builders may custom fit them according to the roof s shape and size.
You can see the image below for an example of a knee wall.
One of your 2x4s will act as the bottom of your wall and will not be cut.
If you aren t sure whether or not your attic contains knee walls go and look around the edges.
A knee wall is a partial height wall that extends from the attic floor to the bottom of the rafters.
1 a continuous air barrier can be installed on the exterior of the kneewall framing from the top of the knee wall down to the attic floor including the spaces between the attic floor joists from the bottom of the knee wall to the ceiling deck below or 2 a continuous air barrier can be installed along the underside of the attic roofline from the top of the knee wall to the top plate of the home s exterior wall.
Its purpose is to create flat vertical walls in the attic space.
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There are two ways to block off this air flow.
Unlike other kinds of knee walls this kind of wall extends all the way to the rafters but because of the slope of the roof it is shorter than a full height wall.
What are knee walls.
The knee wall forms the wall of the attic room and it also creates an enclosed space under the eaves behind the wall.
Scribe a line on your scrap piece along the angle formed by the rafter.
Framing basics for attic knee walls along the sides of your loft or attic space.