1 2 12 Roof Pitch

The most common slopes are.

1 2 12 roof pitch. Asphalt shingles shall be used only on roof slopes of two units vertical in 12 units horizontal 2 12 or greater. 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. Metal roof slope is expressed by a ratio indicating the roof pitch which notes the vertical rise of the roof in inches for every 12 inches the roof runs horizontally in other words dividing the vertical rise and its horizontal span. Contemporary houses often have flat roofs which shouldn.

Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks. Comes in colors and an opaque color which would allow light into the area below. 3 12 1 2 12 and 1 4 12. Also if clay and concrete roof tiles are installed on a roof slope of 2 1 2 12 to 4 12 it shall be provided with a double underlayment application.

These roofs have a pitch less than 4 12. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. For a 1 12 pitch roof the only metal product i recommend is a mechanically seamed standing seam. For roof slopes from two units vertical in 12 units horizontal 2 12 up to four units vertical in 12 units horizontal 4 12 double underlayment application is required in accordance with section r905 2 7.

Generally such roofs have a pitch ranging from 1 2 12 to 2 12. Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater. The table below shows common roof pitches and the equivalent grade degrees and radians for each. They have a pitch ranging from 4 12 to 9 12.

If this isn t practical then perform the same measurement on the underside of the roof. There is no standard universal roof pitch roof pitch varies depending on culture climate style and available materials in the usa the range of standard pitches is anywhere between 4 12 and 9 12 in the uk the typical house has a pitch between 40 50 although 45 should be avoided. Most roof s have a pitch in the 4 12 to 9 12 range. 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.

Conventional roofs are the easiest to construct and you can walk on them safely. This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units. We require a 2 12 pitch for our standing seam products. 1 12 pitch roof if this is a porch on a trailer use corrugated sheet material can be found at lowes.

We included a roof pitch chart below the 7 12 example image and the calculator below that. In a few rare special occasions we might approve down to 1 5 12.