UFC 3-110-03
26 September 2006
3-3.2
Wind Pressure.
In areas where the roof deck design is required to resist wind pressures of 220 kg/m2
(45 lbs./ft.2) or more as determined by ASCE 7, the manufacturers' high wind design
and installation requirements apply. This may include requiring six (6) nails per shingle
as determined by applicable building code, wind speed, slope, and building height.
3-3.3
Perimeter Drip Edge.
Perimeter drip edges are required for all high slope roof systems installed over wood
decks.
3-3.4
Valley Flashing.
Closed cut valley flashing may not be used.
3-3.5
Special Underlayment.
Special underlayment is defined as one layer of self-adhering polymer-modified asphalt
bitumen membrane. Special underlayment is to be located where frequent infiltration is
anticipated. General placement locations are eaves, valleys, sidewalls, headwalls, and
penetrations.
3-4
TILE ROOFING.
Clay and standard concrete tiles are the preferred tile system. Avoid using lightweight
concrete tiles unless required for structural and aesthetic reasons. The following
requirements apply to tile roofing.
3-4.1
Fasteners.
Tile fasteners must be stainless steel or copper, 1-inch engagement in the substrate.
Fastener heads shall be of sufficient diameter to prevent pull over of tile. Galvanized
fasteners may not be used. Do not use wire ties to fasten tiles to the roof deck.
3-4.2
Flashing.
Flashings must be copper, lead, or stainless steel.
3-4.3
Perimeter Drip Edge.
Perimeter drip edges are required for all high slope roof systems installed over wood
roof decks.
3-4.4
Batten Boards.
Provide batten boards under tiles in cold climates to assure the coldest roof surface
possible. Batten board applications also promote ventilation and drying of tile and
under tile. Battens should be considered in all climates where tiles can be lug-hung.
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