The additional lentos have less bounce in them than the existing pole barn roof did that was trusses on 10 centers. Purlins were 2x4 laid flat on 2 centers spanning the 4 between rafters. Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. 2x10 rafters on 4 centers with joist hangers attached to a 2x10 header sitting on 10 pole spacing. This is the right way to fix truss clips connecting the rafter and wall plate. Vertical strapping at eaves pitched roofsĪt eaves level, vertical straps 1m long should be fixed as shown in the diagram opposite at a maximum of 2m centres. While a 2×6 might be nearly double the cost of a 2×4, you can likely space the 2圆s further apart, negating the added expense of increasing your lumber width. Effective strapping at gable wallĮach strap should be fixed as shown in the diagram opposite with noggins between the rafters to support the metal strap along its whole length. 2×6 shed roof rafters are enough for nearly any type of shed a homeowner wants to build. Gable walls need to be strapped to the roof at the maximum 2m centres using 30 x 5m galvanised mild steel straps. Roof joist or rafter spacing should be 12 inches, 16 inches, 19 inches, or 24 inches on center. Find out the advantages and disadvantages of using decking, and the common measurements of rafter spacing for 16-inch and 24-inch panels. This diagram illustrates the typical arrangement of a rafter and purlin roof and shows the dimensions referred to in the tables above. Learn how to set rafters for a tin roof based on the width of the metal panels. Roof pitch between 30 and 45 degrees strength class C24 Size of purlins in mm First step, lets collect all the given information within the question: Ceiling not attached to rafters and a snow load of 30 psf: Use Table R802.4.1 (3) Roof Rafter Spacing: 12 inches.
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