Knee Wall To Support Porch Roof Rafters

The next step is to construct a mid span knee wall to help support the roof rafters.

Knee wall to support porch roof rafters.

Baluster style knee walls provide a better view for those who are seated and better airflow compared with solid panel options. Knee walls are short usually wooden walls installed around the sides of an attic where the rafters meet the floor. Our roof span on the new porch side is 24 feet. You can see the image below for an example of a knee wall.

On the other hand solid panels offer more trim detail alternatives and can be designed to look like wainscoating or frame and panel trim. Framing for the mid span knee wall on the roof. Where ceiling joists are installed if the ceiling framing is not in parallel with the rafters then equivalent rafter ties are required to be added or a knee wall dwarf wall can be used when placed on a supporting beam that sits on the building the tops of the wall plates of the exterior walls. The knee wall in an attic drops.

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. 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. Ching defines a knee wall as a short wall supporting rafters at some intermediate position along their length. In his book a visual dictionary of architecture francis d.

The knee wall forms the wall of the attic room and it also creates an enclosed space under the eaves behind the wall. The midpoint of this span is at the exterior wall of the cottage. The mid span knee wall is constructed on top of the exterior wall.