Roof Pitch For A Flat Metal Roof

A flat roof with a slight pitch or low slope can usually have a standing seam metal roofing installed.

Roof pitch for a flat metal roof.

These moisture problems can lead to a number of other problems like corrosion of metals and wiring wood decaying molds. 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. Minimum pitch for metal roof. Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels.

A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. The way pitch also known as roof slope is measured is rise over run. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. 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.

Contemporary houses often have flat roofs which shouldn. Roofs with a pitch lower than 1 5 b would problems with condensation and air water movement through the deck and condensation buildup. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12.

Generally these low pitch products are used on commercial an d industrial buildings. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum. That is why you may have noticed that just about all of the roofs you see with very low under about 2 1 2 12 pitch have coverings. The traditional metal roof types such as 5v crimp shown above and corrugated are rated by the manufacturers for use down to a 3 12 pitch three inches of vertical rise for every foot of horizontal run.

In order to achieve this drop a slightly steeper angle of 1 40 1 44 should be the aim when installing a flat roof as this accounts for surface deviations and material deflection among other things. There are mechanically seamed vertical metal roofs which can be used as low as a 1 4 12 pitch. Normally 1 80 0 72 is the recommended minimum angle for a slope and this is universal across the vast majority of flat roofing systems regardless of the materials that they incorporate. The minimum roof slope for metal roofs is dependent upon the roof profile.

It is all a matter of finding the right metal roof for that pitch. What is the standard pitch for a roof. 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.