UFC 3-110-03
26 September 2006
Table 3-1. Construction Detail Limitations For Steep Slope Roofing
NRCA Details &
Comments
Figures
Shingles
Figure 1, page 337
Do not use.
Figure 15, page 349
Do not use.
Figure 22, page 354
Use only when building life expectancy is less than 20 years.
Figure 27, page 357
Do not use.
Figure 28, page 357
Do not use.
Asphalt Shingles
ASPH 1-2
Flashing to be 200 mm (8 in.) minimum height.
ASPH 3-3a
Must have an integral (welded) cricket attached to curb for roof penetrations
greater than 305 mm (12 in.) (i.e. no dead valleys wider than 305 mm (12 in.).
ASPH 4
Eave and rake flashing to extend a minimum of 305 mm (12 in.) under shingles.
ASPH 7
Closed cut valleys strongly discouraged (woven or open valley encouraged).
Historic Roof Consultant to design or review details.
Clay Tile
Figure 1, page 362
Do not use flat interlocking, french interlocking, plain tiles.
Figure 2, page 363
Do not use unless matching existing.
Figure 12, page 381
Do not use.
Roof Consultant to design or review details.
Slate Tile
Not allowed.
Wood Shakes
Not allowed.
Wood Shingles
Sheet Metal
SM 1-8
Sealant beneath cover plate to be high quality non-curing butyl, Depth of face
side metal to be 200 mm (8 in.) minimum
SM 4,6,8
Fasteners may not penetrate both pieces of sheet metal, must allow for thermal
expansion.
SM 14
Surface mounted counter flashing should be limited to non-permanent
construction. Use thru wall or recessed counter flashing with lead wedge
securement in permanent construction.
SM 16-20
Concealed sealant to be non-curing butyl.
SM 17 D
Not allowed.
SM-18 E/F
Not allowed.
SM-19
Not recommended for permanent construction.
SM-21
Not allowed.
SM-23
Minimum of two lines of non-curing butyl tape, three lines for permanent const.
SM-24 1/2
Not allowed.
SM-25 3
Not allowed.
SM 25-4
Recommended but normally will include two end dams with UV resistant
sealant.
SM-26
Not recommended: Lap seam, mechanically fastened seam, overlap standing
seam.
Do not reference NRCA details, use SMANCA.
A-Mtl
Do not reference NRCA details, use MBMA.
S-Mtl
20
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