Roof Slope 1 4 Over 12 Roof Plan Notes

The table below shows common roof pitches and the equivalent grade degrees and radians for each.

Roof slope 1 4 over 12 roof plan notes.

See roof details on sheet a530 and where called out on wall sections. Definitions vary on when a roof is considered pitched. 4 12 roof pitch 18 angle 18 43 degrees details. What is a roof pitch examples.

Roofing terminology for roof pitch are. These roofs have a pitch less than 4 12. Provide guard rail roof plan general notes a. However you can only use this pitch with built up roofing or specialized synthetic roofing.

Generally such roofs have a pitch ranging from 1 2 12 to 2 12. Provide positive drainage to roof or deck drains at slope 1 4 per foot minimum on the entire roof. Most roof s have a pitch in the 4 12 to 9 12 range. Thus pitch is typically greater in areas of high rain or snowfall.

Roof pitches 4 12 thru 12 12. The exact roof slope in degrees is given by the arctangent. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. If a roof rises 1 in a length of 12 this is 1 12 roof pitch.

Provide a minimum roof r value of r 24 or greater. Provide tapered insulation as required to maintain a 1 4. The examples below provide visual examples of roof pitch. For example if you measure 4 inches the pitch of your roof is 4 12.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. The replacement of the roof shall be conducted in such a manner as to protect the existing building and all of its contents in their entirety. To see roof pitch to degrees equivalents. 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.

Roof slope roof angle and pitch degrees. Conventional roofs are the easiest to construct and you can walk on them safely. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. 48 1219mm taper insulation.

Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks. This will give you the rise over run or pitch. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.

Concrete deck deck clamp clamping ring strainer base flashing ply 40 1016mm hpr modified membrane felt base ply hpr modified membrane min. 1 12 roof pitch angle 4 76 degrees.