At slopes below 2:12, a granule-surfaced asphalt membrane can be installed, and many are available in colors to complement the shingle colors. For reference, 2:12 equates to about 9.5º and 4:12 to about 18.5º). (Note: some roof specifications may express slope in the typical geometric terms of degrees. Most manufacturer and industry recommendations require, or at the very least recommend, special underlayment or other considerations on roofs between 2:12 and 4:12. As well, a slope of 4:12 is most commonly considered the lowest slope for “standard shingle installations”.
ROOF PITCH ONTARIO BUILDING CODE CODE
It is important always to confirm the specific slope requirements with the shingle manufacturer’s product installation instructions and in accordance with local building code requirements, as some shingles may have a minimum slope recommendation higher than 2:12. At a very low slope, any water on the roof, whether rain water or snow melt, drains very slowly and there is a risk of lateral water movement around and through the shingle overlaps. The challenge with very low sloped roofs is simple – gravity. Shingles on a steeper roof also tend to weather at a slower rate due to their favorable angle to the sun’s rays. Steeper roofs “show” the shingles better, and are therefore better suited to premium designer styles. (As always proper safety equipment and precautions must be followed when working on any roof). Roofs at the lower end of the range (about 4:12 to 6:12) are relatively easy to walk and work on.
The majority of North American residential roofs have historically been constructed with a slope between about 4:12 and 9:12. Alternatively, there are smart phone apps that can help, but shingle manufacturers distribute convenient pitch estimator cards which provide a quick way to ballpark the slope.Ī handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. You can measure the roof slope on the bottom side of the roof deck at an easily accessible point such as the rake, using a tape measure and simple geometry. (Note that roof ”pitch” is sometimes used in parallel with roof slope however, roof pitch is technically measured and defined differently, and will not be discussed here). If a roof slope “rises”, say, 4 inches when measured 12 inches along the bottom of a horizontal roof truss, the roof slope is said to be 4:12 i.e., 4 inches of rise per 12 inches (one foot) of run. It’s really up to you and your architect and what looks good for your particular design.Roof slopes are most commonly defined by the rise-over-run ratio. If you do, the look of the house becomes jumbled and it becomes more difficult to build (and expensive.) However, you have to be careful not to use too many different slopes in one design. So, what is the correct slope to use on your new home? In my opinion, utilizing a couple different slopes (one lower-pitched and one higher-pitched) adds interest to the overall composition. However, a steeper roof removes water, ice and snow more quickly than its shallow counterparts and usually means a longer lasting life for your roof. Builders usually need special equipment to build steep-pitched roofs and there is also additional risks for workers. Typically, the steeper your roof pitch, the more expensive it is to have installed. The most common residential roof slopes range from a 4:12 to a 9:12. Then, a 4:12 to a 9:12 is typically a medium pitch range and anything from a 9:12 and above is considered a steep-pitched roof.
Many builders consider a low-pitched roof to be anywhere from a 2:12 to a 4:12 slope. The angled side is the roof, the vertical leg is the rise and the horizontal leg is the flat roof run.Īre there certain pitch standards to abide by when designing your roof? Not really. At that point he will direct his customers to one of several roll-on ‘waterproofing’ products. believes ‘water shedding’ materials like shingles and steel become susceptible to water backflow below a pitch of 4:12. Brian Audia of A&G Roofing in Orillia, Ont. To visualize this, picture the roof pitch as a right triangle. This means a shift in roofing techniques and materials. For example, a roof with a 4:12 pitch rises 4 inches for every 12 inches of horizontal roof run. It is the number of inches of rise for every 12 inches of horizontal distance. The roof pitch is written in a ratio of inches. Well, the pitch of your roof is the angle at which the surfaces slope. Do you want a 4:12 roof or an 8:12 roof? How about a 9:12 roof instead of a 10:12? What is a roof pitch? I’m so confused! You are working with your architect on designing your new home and he or she starts talking to you about roof pitches.
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