Roof Slope 1 4 Over 12 Roof Plan Notes

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.

Roof slope 1 4 over 12 roof plan notes.

Concrete deck deck clamp clamping ring strainer base flashing ply 40 1016mm hpr modified membrane felt base ply hpr modified membrane min. The slope that is created by the structure i e concrete steel or wood etc tapered insulation or a combination of the two. Provide guard rail roof plan general notes a. 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.

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. 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. Provide tapered insulation as required to maintain a 1 4.

Provide a minimum roof r value of r 24 or greater. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. Distance between points 1 and 2. For example if you measure 4 inches the pitch of your roof is 4 12.

48 1219mm taper insulation. This will give you the rise over run or pitch. Provide positive drainage to roof or deck drains at slope 1 4 per foot minimum on the entire roof.