Open Purlin Shed Roof

Shed roof framing process explained step by step instructions.

Open purlin shed roof.

Fasten the purlin with 16d common nails into each vertical rafter. In most parts of the united states spacing is no greater than 24 inches on center though your roofing contractor or building engineer can help you determine proper spacing distance for your location. The safe spans below are suitable for sheds and class 1 structures with the following assumptions. Reader john in covington writes.

In architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof. Lay the first purlin at the ridge of the roof down to the chalk line beginning at either corner. High pressure zones kl 1 5 and 2 0 included. All spans to have 1 row of bridging.

The fascia board is the bottom plate and the ridge board the top plate. The use of purlins as opposed to closely spaced rafters is common in pre. Framing a shed roof is similar to framing a wall. Cpe 0 9 and cpi 0 2.

A challenge occurs when clients look to insulate between their roof purlins. I want to insulate the walls and up at the purlins to keep as much usable space as possible with an insulated building. Stick to the basics of simplified design and use dimensions that don t generate waste. Keep it simple and remember.

Snap a chalk line horizontally across the roof two feet down from the top. Cleated or bracketed fixing only no flange bolting. Safe roof purlins spans. I am building an all wood pole building.

The spacing of your purlins depends on the expected snow and wind load. Max roof span allowed 12m.