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Roofing Specialist In Modesto, California
Roofing Specialist In Modesto, California
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The slope or pitch
of a roof is the
degree of roof
incline expressed
as the ratio of the
rise, in inches, to
a run of 12 inches.
For example, a
roof that rises 4
inches per foot of
horizontal length is
described as
having a 4/12 slope.
A slope that rises
18 inches for every
foot has an 18/12
roof slope. A general
rule: The smaller the
first number, the lower
the roof pitch.
The degree of roof incline ––slope–– is a key factor in determining
the type of roofing material that should be specified. The normal
application range for shingles is between slopes of 4/12 and 21/12.
On slopes at or below 2/12, shingles should not be used. With low
slopes, water can back–flow under shingles, and the area can be
difficult to ventilate or insulate effectively. Only products like EPDM
(rubber) and SBS (modified bitumen), specially designed for low
slope applications, should be used.
Shingles can be used on slopes between 2/12 and 4/12, but only if
two layers of underlayment or a waterproof moisture barrier is used
beneath the shingles.
On slopes greater than 21/12, special techniques for sealing the
shingles must be employed because steep slopes create a higher
potential for shingle blow–off and/or slippage.
of a roof is the
degree of roof
incline expressed
as the ratio of the
rise, in inches, to
a run of 12 inches.
For example, a
roof that rises 4
inches per foot of
horizontal length is
described as
having a 4/12 slope.
A slope that rises
18 inches for every
foot has an 18/12
roof slope. A general
rule: The smaller the
first number, the lower
the roof pitch.
The degree of roof incline ––slope–– is a key factor in determining
the type of roofing material that should be specified. The normal
application range for shingles is between slopes of 4/12 and 21/12.
On slopes at or below 2/12, shingles should not be used. With low
slopes, water can back–flow under shingles, and the area can be
difficult to ventilate or insulate effectively. Only products like EPDM
(rubber) and SBS (modified bitumen), specially designed for low
slope applications, should be used.
Shingles can be used on slopes between 2/12 and 4/12, but only if
two layers of underlayment or a waterproof moisture barrier is used
beneath the shingles.
On slopes greater than 21/12, special techniques for sealing the
shingles must be employed because steep slopes create a higher
potential for shingle blow–off and/or slippage.
