4 12 Pitch Roof Slope

These roofs have a pitch less than 4 12.

4 12 pitch roof slope.

They have a pitch ranging from 4 12 to 9 12. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. 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. Modified bitumen roofing requires a minimum roof pitch of 1 4 12 or greater.

For example if you measure 4 inches the pitch of your roof is 4 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each. The slope of a roof often referred to as the pitch is determined by rise over run the roof s vertical rise in inches for every twelve inches of horizontal length the run. A 4 12 roof pitch can also be expressed as 4 over 12 and when you re talking to a roofer this is the most common way you ll hear it explained because it s easy to say in conversation.

Roof pitch slope roof angle degree 1 12 pitch. Roof pitch degree table. 4 12 roof pitch to angle 18 43 degrees. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12.

Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater. Another way to express a 4 12 pitch is 4 and 12 in this pitch the four is your roof s rise and the twelve is the roof s run. The roof s incline increases four feet for every 12 feet of horizontal measurement. 4 12 roof pitch angle 18 43 degrees.

What is a 4 12 roof pitch. Conventional roofs are the easiest to construct and you can walk on them safely. Also referred to as 4 12 roof slope 4 on 12 4 to 12 and 4 12 roof angle. 4 12 roof pitch to angle 18 43 degrees equivalents.

So a roof with four inches of rise every 12 inches horizontally run would have a slope of 4 12 sometimes displayed as 4 12. Sprayed polyurethane foam roofing requires a minimum roof pitch of 1 4 12 or greater. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. 4 12 roof pitch equivalents roof rises 4 in a length of 12.

This will give you the rise over run or pitch. You can also calculate roof pitch even without using a roof slope calculator.