What is roof slope? Does the slope of the roof limit the choice of shingle?
The slope of the roof is measured by the rise vs. the run, or the number of inches vertically by the number of feet horizontally. Some roof slopes can limit the choice of shingles that can be used. For Instance: • A roof slope below 2/12 (2 inches per one foot) cannot use shingles. • Roof slope between 2/12 and 4/12 require lowslope application techniques, including application of waterproofing underlayment as appropriate. • Roof slopes above 21/12 require steep-slope application techniques. Your roofing contractor should consult the application instructions found on each shingle bundle wrapper or installation instructions supplied separately for further details.
