Attic Knee Wall Framing

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.

Attic knee wall framing.

One of your 2x4s will act as the bottom of your wall and will not be cut. Its purpose is to create flat vertical walls in the attic space. The knee wall forms the wall of the attic room and it also creates an enclosed space under the eaves behind the wall. If you aren t sure whether or not your attic contains knee walls go and look around the edges.

Knee walls are short usually wooden walls installed around the sides of an attic where the rafters meet the floor. You can see the image below for an example of a knee wall. Determine the angle of rafters by setting the scrap piece of 2x4 in a vertical position against the side of a rafter. Scribe a line on your scrap piece along the angle formed by the rafter.

The space behind the. 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. 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. Framing an attic knee wall july 16 2018 by zamira leave a comment remodel your attic e extreme how to how to sheathe an attic kneewall and when to install a knee wall in your attic hidden door knee wall ana white framing attic knee walls how to frame.

A knee wall is a partial height wall that extends from the attic floor to the bottom of the rafters. What are knee walls. The knee wall will be built on the floor of the attic and then tipped into place against the rafters. There are two ways to block off this air flow.