Supporting Roof Rafters Without Knee Wall

This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams.

Supporting roof rafters without knee wall. This indicates that the wall is bearing the weight of those joists supporting upper stories of the home or the roof. Check that the 2 by 4 is plumb with a spirit level. Some of these can support the roof and prevent ridge sagging and wall spreading. A knee wall is a short wall typically under three feet one metre in height used to support the rafters in timber roof construction.

Collar ties rafter ties tension beams structural ridge beams. At the peak the rafters are nailed to a ridge board and at. 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. In his book a visual dictionary of architecture francis d.

You can see the image below for an example of a knee wall. Knee walls are short usually wooden walls installed around the sides of an attic where the rafters meet the floor. In a sloped roof common rafters run from the peak of the roof down to the top of the exterior walls of the building. Without support for those spliced boards they ll collapse downwards.