Safe roof purlins spans.
Open purlin shed roof.
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.
A challenge occurs when clients look to insulate between their roof purlins.
Fasten the purlin with 16d common nails into each vertical rafter.
Max roof span allowed 12m.
Reader john in covington writes.
I am building an all wood pole building.
I want to insulate the walls and up at the purlins to keep as much usable space as possible with an insulated building.
Insert two equally spaced nails into the rafter.
The fascia board is the bottom plate and the ridge board the top plate.
Cleated or bracketed fixing only no flange bolting.
Cpe 0 9 and cpi 0 2.
Purlins support the loads from the roof deck or sheathing and are supported by the principal rafters and or the building walls steel beams etc.
The purlins are 2x8s.
High pressure zones kl 1 5 and 2 0 included.
Keep it simple and remember.
Lay the first purlin at the ridge of the roof down to the chalk line beginning at either corner.
The spacing of your purlins depends on the expected snow and wind load.
The safe spans below are suitable for sheds and class 1 structures with the following assumptions.
Framing a shed roof is similar to framing a wall.
All spans to have 1 row of bridging.
Shed roof framing process explained step by step instructions.
Snap a chalk line horizontally across the roof two feet down from the top.