Roof Slope 1 4 Over 12 Roof Plan Notes

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Roof slope 1 4 over 12 roof plan notes.

See roof details on sheet a530 and where called out on wall sections. 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 ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. For example if you measure 4 inches the pitch of your roof is 4 12.

The slope that is created by the structure i e concrete steel or wood etc tapered insulation or a combination of the two. Provide tapered insulation as required to maintain a 1 4. Provide guard rail roof plan general notes a. Provide positive drainage to roof or deck drains at slope 1 4 per foot minimum on the entire roof.

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. 48 1219mm taper insulation. Provide a minimum roof r value of r 24 or greater. Distance between points 1 and 2.

Concrete deck deck clamp clamping ring strainer base flashing ply 40 1016mm hpr modified membrane felt base ply hpr modified membrane min. 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. However you can only use this pitch with built up roofing or specialized synthetic roofing.