Don't do this on a house without an engineers okey dokey. The ridge beam is capable of hanging the common rafters between those trusses. Your call, I was just playing with it, basically I just made the ridge into a designed ridge beam supported by trusses at 10' spacing, run a collar tie directly under the ridge on those tied trusses. 14 if you built it like a truss, which wouldn't be wrong, just overkill here. Hmm, got another calc hidden away for this ġ5 LL, 10DL, 120, 72(span of each rafter), 9 pitch, 2圆, #2 mixed oak, I chose 16d sinkers, looks like 8 nails in each end, tie to rafter, would work. The following are the recommended screw spacing patterns for standard metal roofing projects to help you determine how many screws you need. Now, what is it going to take to resist the horizontal thrustġ44 width, 25psf load, 9 pitch, 120 spacing=1000 lbs thrust, that is the rafter to tie connection requirement. For instance, you need 0.8 x 10 8 screws for 10 square feet of metal roofing and 0.8 x 300 240 screws for a 300 square-foot metal roof. Go here and plug in, I used full 2x10" mixed oak and passed. Since we are using metal roofing there is not much deal. The plan was approved by city but now they are saying 6 ft spacing is not enough and least it can be is 4 ft. We have 2X4 cross beams going across every 24 inches. The ridge supports the center half of the roof so a swath 6' wide. Most often seen in metal buildings, purlins are themselves supported by rafters and walls all critical to structural support. Hello, We are in process of building a patio cover using metal sheets as covering. The installation of metal roof purlins is critical for the structural integrity of the roof. In areas with mild climates, patio roofs are generally designed for loads of 30 psf (pounds per square foot). However, for roofs with heavier snow loads, the spacing should be closer, around 2 inches on-center. 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. Usually 400, 450 or 600mm, but any value can be used up to 610mm max. This is the distance between rafter centres. Total load is going to be 10psf dead + 15psf live=25psf Typically, the recommended spacing for metal roof purlins is 3 inches to 4 inches on-center. This demo version is fixed at 1m clear span. It's small, let's see what it would take.
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