![]() ![]() I always look this stuff up before doing a job rather than relying on my memory or judgement. Lath spacing up the slope is another issue and depends on the roofing type but maybe 3'. Step on a lath board with a big knot over spanned and it could break. In areas with mild climates, patio roofs are generally designed for loads of 30 psf (pounds per square foot). The spacing of the rafter is frequently measured in 16 inches and 24 inches for tin roofs. An essential part of planning a patio roof or gazebo project is determining the number, size, and spacing of rafters, beams, and posts, according to the loads they will carry. As a result, the sheeting can be moved upward or downwards on the roof. ![]() That's mostly a worker safety issue rather than final roof load requirement. A 2 gap between the metal roofing sheets at the roof’s peak is recommended for a metal roof. That is the rafter spacing times the horizontal distance between the beams. 2x4 lath to 3' at most and 2圆 lath to about 4'. The math part is figuring out the area and load each rafter will be supporting. Generally speaking my preference is a full 1'' board on rafters or trusses up to 24''o.c. Seems that banks have even figured this out these days as all the agri buildings here abouts are lath these days. It's tough to consistently sink fasteners through a roofing panel into a 1.5'' wide framing member you can't see. Batten Spacing for Polycarbonate Roofing. In agri buildings purlins have fallen out of favor due to their propensity to leak. ![]() In my world a purlin is a 2x installed on edge usually between trusses spaced from 4-12 feet o.c.īoards laid flat across rafters or trusses are called lath and are either 2x or 1x. ![]()
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