Roof Support Knee Wall

Knee walls are short usually wooden walls installed around the sides of an attic where the rafters meet the floor.

Roof support knee wall.

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. Measure the height of the rafters from the point where they meet the floor joist to the peak of the roof. You can see the image below for an example of a knee wall. This would not correct the sag there now but we were told it would not get any worse since the wall was put in.

Sometimes commonly referred to as a corbel support or knee brace support versions of this bracket are routinely used on contemporary homes as a support for countertop overhangs shelves mantels or anywhere a cantilevered shelf or eave needs support or aesthetic enhancement. What are knee walls. The knee wall in an attic drops. The building inspector suggested putting in a knee wall.

In his book a visual dictionary of architecture francis d. Ching defines a knee wall as a short wall supporting rafters at some intermediate position along their length. The home is 9 years old and we were told the settling of the home may have created this problem. The knee wall forms the wall of the attic room and it also creates an enclosed space under the eaves behind the wall.

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. Divide that number by four to determine how many braces you need to place on the rafters. 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. 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.

A knee wall is a short wall typically under three feet one metre in height used to support the rafters in timber roof construction.