Low Slope Metal Roof Leaking Shed Snow

As stated in the.

Low slope metal roof leaking shed snow.

It is critical that a designer specify enough snow retention devices based on the slope and snow load. Both snow retention items are sometime necessary. That s why the panels should be mechanically seamed and not just snapped together. The metal building industry needs to address the issue of low slope roofs in areas where it snows.

Constructing a new shed roof at the desired pitch is as easy as knowing how to use a speed square. Again we suggest a minimum slope of 1 inch per foot. This means that low slope roofs are more susceptible to leaking due to water backing up or not shedding from the roofing system fast enough particularly in a driving rain storm. Actually when a standing seam metal roof has a leak it is commonly at some type of flashing area.

Therefore if your roof rises 4 inches over the course of 12 inches of horizontal run then your roof pitch is 4 12. Remember that pitch is calculated as the height or rise of a roof pitch over 12 inches of horizontal run. Failed sealant or butyl tape sealants and butyl tape are used to seal out water dirt and other debris that could compromise a metal roof. But without designing the snow retention based on accurate testing you could be wishing you had that steep slope and metal roof which was always intended to shed snow.

Unfortunately it is frequently the contractor not the architect who gets sued when ice dams cause leaks. An older roof will naturally experience more problems than a new roof but with regular inspections and ongoing repairs you can greatly extend the life and service of your roof. As you probably guessed lower sloped systems don t shed water as quickly as a steep slope roof. The flatter profile of low slope roofs means there is greater potential for heavy snow or rain runoff to exceed the shed capacity of the panels.

In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. If these are damaged missing or applied incorrectly leaks could occur. 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.