Rev. 13 November 1, 2016
Page | 274.4 Division 04 - Masonry
Consider roof system thicknesses when designing elevation of transitions between exposed masonry and roof membrane
base flashing substrates. Provide a constant level transition a minimum of 12" above the high point of the roofing system,
whenever possible.
Provide soldered, stainless steel flashings within adjacent constructions (i.e. masonry, siding, windows, doors, louvers,
etc.) with watertight end dams and weeps to separate walls from roofs and prevent moisture infiltration into walls.4.5 Division 05 – Metals
Roof slope shall be provided by the structural roof framing, in lieu of installing level framing and using tapered insulation,
unless vertical building expansion could occur in the future. Consult with the Owner's Project Manager during the
Schematic Design Phase.05 31 23 Steel Roof Decking
Steel roof decking to be galvanized 20-gauge minimum. Steel deck spans and securement shall meet the more stringent of
the Building Code (based on ASCE/SEI 7-10 wind design) or FM Global wind uplift pressures, and shall be
closely coordinated with the roofing system approval. Perimeter and Corner Enhancements shall be used for steel deck
attachment, per FM Global standards.05 50 00 Metal Fabrications
All rooftop steel equipment frames to have round legs to facilitate flashings. A minimum of 36" clearance shall be
provided between roof surfaces and bottom elevation of horizontal framing members. Uninterrupted 12" flashing height
shall be provided between top elevation of roof and any leg bracing or clip angles.05 51 14 Prefabricated Metal Roof Access Ladders
Roof access ladders shall not penetrate the roof membrane or flashings, and shall be fully supported off the adjacent walls.
Exterior ladders to be either aluminum or painted galvanized steel.4.6 Division 06 – Wood and Plastics
06 10 00 Rough Carpent ry: All wood bl oc king s hall be f ire retarda nt t reated06 10 10 Roof System-Related Rough Carpentry: Wood nailers to be treated construction grade lumber. Fastening
shall follow FM Global requirements as listed in Loss Prevention Data Sheet 1-49. Minimum nailer size for perimeter
wood blocking shall be nominal 2" x 6". Fastener spacing shall be reduced by a factor of two in exterior corner zones
of the roof. All fasteners shall be FM Global approved screws (not nails), with each wood member fastened individually.
At perimeter wood blocking, the bottom nailer shall be fastened to the structure through 5/8" diameter fender washers,
with fasteners countersunk. Subsequent nailer fasteners shall not require 5/8" diameter washers.