Ontario Roof Pitch

How roof pitch determines suitable roofing systems.

Ontario roof pitch.

The roof pitch is described by the vertical rise divided by horizontal span. The ontario building code slope 9 26 3 1. However you can only use this pitch with built up roofing or specialized synthetic roofing. The british standard for tilling and slating provides specific guidance about double lapped slating where calculations and recommendations for pitch and lap of slate are based on.

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. Contemporary houses often have flat roofs which shouldn. This article excerpts from provides copies of roof framing suggestions from canadian building codes and the cmhc wood frame house construction guide. Forming part of sentence 9 26 3 1 1.

This part is well known as slope in geometry tangent function or stair construction in trigonometry. Roofing types and slope limits. However roof pitch is technically measured and defined differently and will not be discussed here. Roof pitch in layman s language simply refers to the steepness of the roof.

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. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Flat and nearly flat roofs a pitch of 1 in 12 or 2 in 12 cannot be covered with shingles or shakes of any material since there is not enough angle to combat the danger of blow off. Note that roof pitch is sometimes used in parallel with roof slope.

The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Roof pitch is used to describe the slope or angle of the roof. What is the standard pitch for a roof.

Framing any roof but particularly a gable roof low slope roof and cathedral ceilign roofs requires collar ties rafter ties and possibly a structural ridge beam to support the roof and to. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. Slope 1 except as provided in sentences 2 and 3 the slopes on which roof coverings may be applied shall conform to table 9 26 3 1. Roof framing suggestions canadian guidelines.

For that reason flat roofs are limited to these types of covering materials.