Roof Load Width Skillion

A butterfly roof has two skillions which angle down towards the centre.

Roof load width skillion.

Wall length rafter thickness. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Rlw is used to calculate the sectional size of some roof members and supporting wall. Roof span is also of important consideration as the larger overall roof area will require more stringent roof bracing.

This is the sixth video in the series on the timber framing code. Variations on the skillion roof include circular or oval shaped designs and the butterfly roof. Span calculator for wood joists and rafters also available for the android os. Skillion lean to roof framing calculator with running setout points inch all measurements are actual physical finished sizes.

Roof load width rlw the other important consideration in determining timber lengths and sizes of your pergola is the size and weight of the roofing material the timber structure intends to hold up. For the 4 x8 lean to in the example in to determine rise the run is the width of the building or 4 feet. These diagrams may also be used to determine roof load width for floor joists. Wall length rafter thickness wall width rafter depth wall thick rafter spacing wall height roof angle.

A roof slope of greater than 7 12 such as slopes between 8 12 to 12 12 is where the air dynamic issues start to arise requiring additional roof bracing to help mitigate the higher overall profile of the roof. For a skillion or shed roof it s the distance from one supporting wall to the other. Batten width top batten set in batten overhang. Wall width rafter depth wall thick rafter spacing.

Skillion lean to roof framing calculator with running setout points metric. Determination of roof load width. This video looks at roof load width rlw.