Roof Supports Run Parallel To The Ridge

Position the square with the base or raised edge on top of the rafter board.

Roof supports run parallel to the ridge.

Essentially the spine of a conventional stick framed roof the ridge board is sandwiched between the meeting ends of the roof rafters. 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. 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.

Rafters are sloped beams that run from the roof s ridge to the eaves. Collar ties rafter ties tension beams structural ridge beams. 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 ridge is the peak where two sloped roof sections meet.

Start at one of the eaves of the ridge and wrap a shingle around the ridge of the roof. In the case of the perpendicular gable the roof rafters are parallel to the wall the rafters that form the wall side gable are flush against the wall and the ridge board at the peak of the roof. The shingle should be in the center of the ridge. Part of a roof s frame a ridge board runs horizontally along the peak of a sloped roof.

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. Continue along the ridge of the roof until you have all of the shingles secured. 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. 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.

Mark the plumb line for the ridge line cut near the end of the rafter board. The ridge is the horizontal peak of the roof.