Roof Supports Run Parallel To The Ridge

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.

Roof supports run parallel to the ridge.

Part of a roof s frame a ridge board runs horizontally along the peak of a sloped roof. The venting in the roof should never be cut all the way to the edge but that doesn t mean you can t install the vent cap all the way to the edge. The resulting low slope roof on one side of the ridge board changes the way roof loads are resisted such that a ridge beam should be provided. Mark the plumb line for the ridge line cut near the end of the rafter board.

Measure the length of line on the rafter less 1 2 the ridge board and make another plumb line mark parallel to the first. The existing ridge board might serve as a ridge beam if adequate supports can be installed such as a wall or closely spaced columns. They provide the support for the external roofing material. The ridge is the horizontal peak of the roof.

Rafters are sloped beams that run from the roof s ridge to the eaves. Some of these can support the roof and prevent ridge sagging and wall spreading. Collar ties rafter ties tension beams structural ridge beams. Position the square with the base or raised edge on top of the rafter board.

Line up the edges with the chalk line and secure with 2 roof nails right above the adhesive line on the shingle tab. The ridge is the peak where two sloped roof sections meet. We cut the vent in the roof decking sheathing to within a foot or 2 of the edge and always install shingle vent 2 right to the edge because most people think it s a cleaner look. The shingle should be in the center of the ridge.

Start at one of the eaves of the ridge and wrap a shingle around the ridge of the roof. A purlin is a horizontal piece of timber or metal which supports the roof s rafters or decking and helps to prevent your roof from sagging.