Minimum Slope For Flat Seam Copper Roof

The minimum roof slope for metal roof panels depend on 3 different scenarios.

Minimum slope for flat seam copper roof.

Lapped nonsoldered seam metal roofs with applied lap. They are also used on curved surfaces such as domes and barrel vaults. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope.

There are some opinions that standing seam metal roof minimum slope is 12 but it increases the possibility of leaking on the few first days of snow arrival. Speaking about standing seam metal roof slope it is a general and a self evident knowledge that the steeper it is the faster it is for snow rain or drain to come down the roof. The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. You can often see such examples of use over metal decks.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Standing seam manufactures allow applications of metal coverings on slopes of 12 or even more. In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.

According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12.

Minimum metal roof slope depends on the roof profile building design climate and site location. Moreover low slope metal roofs are not prone to the degradation experienced by organic materials enabling these roofs to better resist the elements. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.