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 MIL-HDBK-1001/5A
Table 2
Minimum Slopes for Steep Roofing
NOTES
MATERIAL
MIN. SLOPE
(in./ft.
(percent))
Flat Shingle Tile (clay
5 (42)
or concrete)
One-piece Barrel Tile
4 (33)
Double-layer felt underlayment
(clay or concrete)
required 4-in./ft. (33 percent)
slope, single layer for slope
greater than 4 in./ft. (33 percent)
Two-piece Shingle Tile
4 (33)
(clay)
Interlocking Flat-ribbed
4 (33)
Tile (clay or concrete)
Asphalt Shingles
4 (33)
1 layer, non-perforated saturated
felt underlayment for 2-1/2-in./ft.
(21 percent) slope may be used if
special precautions, described in
the NRCA Steep Roofing Manual and
ARMA Residential Asphalt Roofing
Manual are taken.
Wood Shakes and Shingles
4 (33)
Metal (Corrugated Stl.,
3 (25)
Refer to SMACNA Manual.
Alum.)
Asphalt Shingles
2-1/2 (21)
Requires nonperforated, (square-tab
strip) saturated felt underlayment,
double layered with 19-in. (483-mm)
overlap and set in roofing cement.
Asphalt Roll Roofing
2 (17)
Requires double-coverage (exposed
nails) roll, 3-in. (76-mm) top lap.
Asphalt Roll Roofing
1 (8)
6-in. (152-mm) end lap, (Concealed
19-in. (483-mm) selvage.
Copper, Tern
1/2 (4)
With double locked soldered seams.
Standing Seam, Metal
1/2 (4)
Requires floating-clip design.
36
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