Slopes Of Roofs

The list below contains the common roof slopes and the terms which classify them.

Slopes of roofs.

If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio. Express the slope of a metal roof by a ratio which indicates the pitch of the roof. Clearly once we get near 90. Low slope roofs are from 0 to 3 12 in pitch.

If asphalt shingles are to be. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. Notes to the table above 1. Some sources consider low slope to include 3 12 pitch roofs.

For example if you noticed water collecting on your roof the problem is probably related to the slope. The profile is the shape taken by the sheets when you bend them to form panels. Using the space as a full. Minimum and maximum roof slope limits vary based on specific roof system and project types.

9 12 20 12 steep slope. You need to consider the slope requirements of each panel to determine this minimum slope. Following is a review of code requirements and nrca s roof slope guidelines as well as some additional factors designers should consider. Collegiate gothic style roof of the sage hall at cornell central campus.

If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12. 2 12 4 12 conventional slope roof. I e 4 inches of rise per 12 inches one foot of run. Slopes greater than 18 12 are found on a frame roofs and some mansard style roofs.

The sides can either be flat or curved depending on the style. Roof slope is a very important aspect and it is considered the primary factor in roof design. The slope of a roof has an effect on the interior volume of a building the drainage the style and the material you use for your covering. A bonnet roof with the lower slopes at a lower pitch.

Mansard roofs can help create a great deal of extra living space. This roof form is a classic on some barns in the western united states. The minimum slope of a roof depends on the roof s profile. Mansard roof on a county jail.

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. Roof slopes are most commonly defined by the rise over run ratio. Proper roof slope can be an important consideration when designing high performance roof systems.