Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.
Pitch of a roof from the side.
Contemporary houses often have flat roofs which shouldn.
The pitch of a roof is its vertical rise over its horizontal span.
The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed.
Roof pitch is used to describe the slope or angle of the roof.
However most often a ratio of pitch also fraction is slang used for the more useful slope of rise over run of just one side half the span of a dual pitched roof.
This article describes both roof slope and roof pitch and the differences between them as they are not the same.
However from the wind uplift mitigation perspective a 7 12 roof slope can be considered as a two story building due to the higher overall steepness and profile of the roof.
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.
A roof slope of 7 12 is also good and can provide the additional benefit of helping minimize the effects of wind driven rain.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
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.