Roof Slope Area Conversion Tables

For example if you measure 4 inches the pitch of your roof is 4 12.

Roof slope area conversion tables.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Notes to the table above. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. To accurately calculate the area of your roof you must first determine its slope or pitch.

If you can give them the exact chart and measurement that you like the look of they can work to those specifications. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. 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. Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree.

While it is possible to estimate the amount of necessary materials using only the total roof area measurement as can be seen from the table depending how large the pitch of the roof the actual area of the roof can differ by up to 2 236 from the measured total area at a pitch of 24 12. For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. Low slope roofs are from 0 to 3 12 in pitch. This will give you the rise over run or pitch.

The combination of two numbers are used to display or show the roof pitch. Divide the rise by the run the run is 12. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.

Some sources consider low slope to include 3 12 pitch roofs. The charts are there to provide people with an idea of what the actual slope will. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.