Roof Supports Run Parallel To The Ridge

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

Roof supports run parallel to the ridge.

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. 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. Measure the length of line on the rafter less 1 2 the ridge board and make another plumb line mark parallel to the first. 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.

Start at one of the eaves of the ridge and wrap a shingle around the ridge of the roof. Mark the plumb line for the ridge line cut near the end of the rafter board. 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. Some of these can support the roof and prevent ridge sagging and wall spreading.

Part of a roof s frame a ridge board runs horizontally along the peak of a sloped roof. Rafters are sloped beams that run from the roof s ridge to the eaves. 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. Collar ties rafter ties tension beams structural ridge beams.

Line up the edges with the chalk line and secure with 2 roof nails right above the adhesive line on the shingle tab. Position the square with the base or raised edge on top of the rafter board. The ridge is the horizontal peak of the 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.

They provide the support for the external roofing material. Essentially the spine of a conventional stick framed roof the ridge board is sandwiched between the meeting ends of the roof rafters.