Moreover, Low Slope Metal Roofs are not prone to the degradation experienced by organic materials, enabling these roofs to better resist the elements. The required roof slope varies with application of materials and use. Use our Wisconsin Roof Snow Loads map to easily determine the roof design snow load (Wisconsin Administrative Code: SPS 321 SubChapter 2) for any location in the State of Wisconsin. Use our Wisconsin Roof Snow Loads map to easily determine the roof design snow load (Wisconsin Administrative Code: SPS 321 SubChapter 2) for any location in the State of Wisconsin. If this isn't practical then perform the same measurement on the underside of the roof.

I don't know what you mean by "the optimum roof pitch in Vermont for shedding snow with a metal roof." You can safely measure the roof pitch from inside your attic with a level that is either 18 or 24 inches, a tape measure and a pencil. In retrofit projects, a sub-framing system is attached to the existing flat roof surface to provide a minimum ¼:12 roof pitch. With regards to the pitch, the building standard code BS 5534 recommends a minimum pitch of 200 for slate roofs. Typically, large-footprint, single-story warehouses and pre-engineered metal buildings will utilize low-slope metal roof … They would say “use a low slope (approximately 5/12) and keep the snow on.”.

If you don't like the looks of a 12/12 roof, and you don't like to work on a steep roof, you are free to build a roof with any pitch you want. The slope of the roof is measured by the vertical rise of the roof to the horizontal run and is expressed as a fraction. There are advantages and disadvantages to having a steep pitch versus a shallow, or low, pitch_,_ the most obvious of which is the roof's ability to shed or withstand heavy snow, rain or wind. Each roof cladding section specifies: a minimum acceptable roof slope for the given profile (see Table 1) roofing material manufacturing and other standards flashing and junction details including minimum flashing covers and upstands roof penetration details (note that roof penetrations equal to or below 10° require specific design).

See the below Florida Building Code Fifth Edition (2014, 2017) sections below to determine which slope is appropriate based on your specific design scenario. They provide excellent weather resistance, great value and, now more than ever, a tremendous range of …

Pitched roofs, including gabled and hipped roofs, are the most common types in the United States.

greater. That works out … A 4/12 roof pitch indicates the roof rises 4 inches in height for every 12 inches, as measured horizontally from the edge of the roof to the centerline. Basically, the steeper the pitch, the better it can shed snow and rain. Begin by measuring 12 inches on your level and marking it …
Manufacturers therefore recommend a ‘minimum pitch’ to install their product so that rainwater and debris runs off the glass more effectively, keeping the skylight cleaner for longer.


The minimum requirement is 2/12. 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. The recommended pitch for skylight installation on a flat roof. Wisconsin has not adopted the International Residential Code (IRC) and utilizes its own Uniform Dwelling Code (UDC) for all residential structures. MINIMUM ROOF SLOPES (degrees) for a rainfall intensity of 190mm/hr sheeting/decking total roof run length (m) Minimum roof slope (degrees) for sheeting/ decking Maximum roof run length (m) at minimum 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 slope Stramit® Corrugated 5.0 6.0 17 exceeds the scope of this guide 5.0 19 The minimum roof pitch for shedding snow is around 30°, or a 6:12 or 7:12 slope , although this is not a definite, as the material of your roof, the direction of the snow and wind are some factors that can affect whether or not snow will slide, as roofs of as little as 10° have been reported to shed snow . The 2/12 number is rise over run or two units of vertical for every 12 units horizontal.

However, you can only use this pitch with built-up roofing or specialized synthetic roofing.

Low-slope roofs are not totally flat, their roof slope generally ranges from 1/4:12 to 3:12.