Supporting Roof Rafters Without Knee Wall

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

Supporting roof rafters without knee wall.

At the peak the rafters are nailed to a ridge board and at. Some of these can support the roof and prevent ridge sagging and wall spreading. Collar ties rafter ties tension beams structural ridge beams. In a sloped roof common rafters run from the peak of the roof down to the top of the exterior walls of the building.

All outer walls of a home are load bearing as they support the edges of the roof. Check that the 2 by 4 is plumb with a spirit level. In his book a visual dictionary of architecture francis d. You can see the image below for an example of a 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. Without support for those spliced boards they ll collapse downwards. Hold up to the rafter a scrap piece of 2 by 4 lumber a few inches longer than the planned knee wall height with its base on the floor. Ching defines a knee wall as a short wall supporting rafters at some intermediate position along their length the knee wall provides support to rafters which therefore need not be large enough.