Roof Slope 1 4 Over 12 Roof Plan Notes

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Roof slope 1 4 over 12 roof plan notes.

See roof details on sheet a530 and where called out on wall sections. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. This will give you the rise over run or pitch. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

I e if the roof surface slope is 1 4 ft the cricket panel slope should be 1 2 ft there are exceptions to this rule please call us for further information. The slope that is created by the structure i e concrete steel or wood etc tapered insulation or a combination of the two. Provide a minimum roof r value of r 24 or greater. Provide tapered insulation as required to maintain a 1 4.

However you can only use this pitch with built up roofing or specialized synthetic roofing. 48 1219mm taper insulation. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio.

Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. Distance between points 1 and 2. For example if you measure 4 inches the pitch of your roof is 4 12.