Roof Post Spacing

If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.

Roof post spacing.

A 2 2x10 can span 10 feet and so on. 2x12 doubled can span 12 normally. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Spacing will vary be design and roof load but usually 24 on center or less.

Dimensional lumber deck beam span chart the numbers in gray indicate the distance between the support posts. Never place concrete next to wood. As a general rule the best bang for your buck is most typically spaced every 12 feet although 10 foot and 14 foot spacings are often a close second. Engineers have since determined however that the physical design of a post frame building will allow for standard spacing as great as 12 feet from the center when using high quality metal connector plates and lumber.

Roof purlins are 2x4 2x6 or 2x8 lumber that spans between the trusses to provide framing for metal roofing or roof sheathing. May be attached above the trusses on edge or flat or between the trusses using post frame anchors or joist hangers. Rule of thumb a beam can span about one foot for every inch of depth. Roof trusses were usually produced on site in the past.

The most efficient post spacing is going to depend upon the wind and snow load conditions at any particular given pole building site. When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches. Doesn t mater what size the posts are the spacing is governed by beam size and roof load roof slope plays a part in the loading of the beam. With just rafter load.

In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. A double 2x12 beam can span 12 feet. 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.

A 4 by 10 can usually span up to 12 feet between posts.