Metal Roof Drop Per Foot

The minimum pitch for metal roofing varies depending on the profile of the metal.

Metal roof drop per foot.

Some building codes start at one quarter of an inch per foot or two percent. Most metal roofs will have minimum pitches of three in twelve but this might sometimes go down depending on whether there are special installation procedures issued by the manufacturer regarding that particular roofing material. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

Low slope metal roofs require less material which reduces the overall load on the building s structure. 3 12 1 2 12 and 1 4 12. Panels are often measured in inches use our inches to feet conversion calculator to convert to feet. 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.

However an ideal roof drop per foot should be at least one eighth to one quarter of an inch per foot. Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12. Sometimes pitch is also expressed in fraction form using a fraction with a slash such as 6 12. For budget conscious homeowners metal shingles will run about 7 to 10 per square foot installed while corrugated metal sheets can be installed for 3 50 to 5 50 per square foot for materials and labor.

Keep in mind that neither metal shingles not corrugated metal panels are suitable options for low slope or nearly flat roofs. A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. The most common slopes are. The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally.

You have more than enough slope for your roof however you will likely need some sort of membrane roofing since it is very low slope. Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. Finally divide the square footage of the roof by the square footage of the metal roofing panel to find the number of panels needed for your roof. There are profiled metal roof cladding systems specifically designed for low slope application.

It s a good idea to order an extra 10 to account for cutoffs and waste material. Anything with a slope of some kind will cause water to run off the roof.