A knee wall is a short wall typically under three feet one metre in height used to support the rafters in timber roof construction.
Knee wall roof.
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.
Choice of steel or solid aluminum.
Not every home has knee walls.
Sometimes though there are no soffits.
The upstairs bedrooms are built inside the roof with a peak attic above the bedroom ceiling and knee wall attic spaces behind the bedroom walls.
Old school roof vents which look like rectangles on the roof work pretty well too.
You can see the image below for an example of a knee 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.
What are knee walls.
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If you aren t sure whether or not your attic contains knee walls go and look around the edges.
The peak attic is insulated above the bedroom ceiling and has gable end vents at each end.
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The knee wall in an attic drops.
Knee walls partial walls around knee height or sometimes higher can be part of house foundations bar area dividers or most especially attics under rafters.
Ventilating knee wall attics is challenging.
In his book a visual dictionary of architecture francis d.
They re most often found in finished attics and top floor living spaces.
These low walls help define the living space by creating vertical surfaces between the sloping rafters and the finished floor.
In an ideal world we install soffit vents as intakes make sure the slopes can breathe with ventilation baffles and exhaust through a ridge vent.
Ching defines a knee wall as a short wall supporting rafters at some intermediate position along their length.
Knee walls are the short interior walls built beneath the roof rafters.
Most builders install fiberglass batts between the studs and some type of blown insulation between the floor joists.
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Although kneewalls can help turn attics into living space they often present insulation challenges.