Shed Roof Purlin Spacing

The spacing of purlins on roofs and girts on wall is usually 4 to 6 ft.

Shed roof purlin spacing.

Deciding which one you want to have in your yard is the first step. Traditional shingles clay wood sheet metal or eco living. The 24swg material is a lighter rolling used on smaller buildings. The type of support.

The spacing of the purlins needs to be arranged to suit the roofing while the rafters can be spaced as appropriate to take into account the overall weight. To determine how far apart to set rafters measure the width of the metal panel and then the width of the first hill and valley of the panel. The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof. The heavier 22 swg material is the most widely used with a typical purlin spacing of 1 0m.

Numbers 20 and 22 u s. If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and. There is no standard spacing it depends on what size of rafters you want to use and the span of your shed. It is suited for domestic scale sheds and is slightly cheaper than 22swg sheets.

The shed roof framing design will include the type of shed roof finish. The spacing of the purlins the end and side overlaps of the sheets depends on the angle of the roof for most types of sheet the following are good guidelines but check with the. A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. For sake of discussion we will assume a minimal roof snow load of 20 psf pounds per square foot and a 4 12 roof slope.

Time involved and the cost. Wider panels allow for greater spacing between rafters. There are many design plans available to download and videos online to guide you. For standard shed roof rafter spacing see rafter span chart.

Roofing sheets in the uk are available in two thicknesses 0 5mm 24swg and 0 7mm 22swg. Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses. Other relevant factors include the type of wood being used for the rafters the size of the rafters and the load that the rafters need to support. When channels are used the ridge purlin is placed as close to the peak of the truss as possible in order to shorten the connection to the purlin on the opposite side of the centerline.

Next pre drill holes on the end and side ridges of the panels spacing the holes 6 to 8 inches apart. The cos of the purlin spacing is because the load on the purlins is vertical and the purlin spacing is with the run of the roof. Dead load will be the actual weight of the roof steel and the roof purlins. In the order shown above purlins laying flat use 2 20d ring shank nails per connection for trusses with minimal spacing hung purlins for wide span trusses lu26 hangers for 2 6 lu28 hangers for 2 8 etc and purlins on edge overlapped.

Standard gage are generally used for roofing.