Four Side Slope Roof

Here we explain and include examples of simple calculations and also examples of using the tangent function to tell us the roof slope or angle the rise and run of a roof the distance under the ridge to the attic floor and how wide we can build an attic room and still have decent head room.

Four side slope roof. The sides can either be flat or curved depending on the style. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. A roof with the pitch divided into a shallow slope above a steeper slope.

The steep slope may be curved. So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 4 12. The way pitch also known as roof slope is measured is rise over run. Coal tar built up roofs however can have a design roof slope of 1 8 12 1 percent but no less.

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. Most roof s have a pitch in the 4 12 to 9 12 range. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch. Mansard roofs can help create a great deal of extra living space.

The lower slope is much steeper than the upper. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. So the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. They have a pitch ranging from 4 12 to 9 12.

Roof slope pitch rise run area calculation methods. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. An element of the second empire architectural style mansard style in the u s. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit.

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. A mansard roof also known as a french roof is a four sided roof with a double slope on each side that meet forming a low pitched roof. A 4 12 pitch is around 18 5 degrees but not exactly. These roofs have a pitch less than 4 12.

Conventional roofs are the easiest to construct and you can walk on them safely. Built up roofs must have a design roof slope of 1 4 12 or greater 2 slope. A roof similar to a mansard but sloped in one direction rather than both.