Roof-rafter-spacing, builders aren't bound by standard rafter spacing measurements. but they do tend to space rafters in one of several industry-standard increments, typically either 12, 16 or 24 inches apart.. If your project had a rafter length of 8' or less, a safe and strong method is to use 2x8 framed 16" on center. it is always better to have a large rafter, rather than be concerned with a sagging roof., rafter span tables - use these tables to determine lengths, sizes and spacing of rafters based on a variety of factors such as, species, load, grade, spacing and pitch. visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for determining rafter lengths based on rise and run..

In the us they are typically spaced at fractions of the roof sheathing size. since most sheets are 4'x8', typical rafter spacing are 12", 16", 24". in california, 16" is by far the most common for residential construction. 12.4k views, douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. 1 and no. 2, are indicated below. max. dead load (weight of structure and fixed loads) 15 lbs/ft 2. live load is weight of furniture, wind, snow and more.. 1 psf (lb f /ft 2) = 47.88 n/m 2; 1 ft = 0.3048 m.

What is the standard shed roof rafter spacing? for standard shed roof rafter spacing, see rafter span chart. there is no standard spacing – it depends on what size of rafters you want to use, and the span of your shed. for instance, #2 grade 2x4s at 16” on center will span just over 9’., 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. in areas with mild climates, patio roofs are generally designed for loads of 30 psf (pounds per square foot). for heavy roofs or in areas […].

Rafter spacing is based on the width of the metal roofing panels. wider panels allow for greater spacing between rafters. a metal roof must also allow for some overlap on each side of the panels, which will reduce the effective width of the panel., our roof rafter calculator tools are handy for calculating the number of rafters needed, rafter length calculator, lineal feet of rafter, board feed in ridge and sub-facia,and the total board feet in the roof..

Rafter spacing is typically 16" for stick frame and 24" for trusses. the information that you did not provide us is the span of the enclosed porch. at any rate, 2x8 rafters will typically span...