Building298_Part3_Ch6_B30-Revised.pdf

Repair Building Envelope and Interior Finishes, Building 298 WO # N40085-19-F-6882 Building 298, Cherry Point, North Carolina

PART 3 - CHAPTER 6 - Page 633 07/07/2020

B30 ROOFING

GENERAL SYSTEM DESCRIPTION

Provide watertight roof systems compatible with the facility function, construction, and service conditions. Provide complete roof system design and construction services for the entire new facility roof system, including all ancillary and incidental work necessary for a complete, new, watertight roof system installation.

Submittal Requirements: Components of a minimum roof submittal include the roof plan, method of drainage, standard details and details unique to the project, wind load calculations and requirements.

Provide a Pre-Design Roofing Conference (if required in RFP Part 4) and Pre-Roofing Conference to assure roof design and construction is properly coordinated before construction begins.

Built-in gutter systems where drainage passes through an interior space or is concealed in the exterior cavity wall is prohibited.

Refer to Unified Facilities Criteria (UFC) 3-110-03, Roofing, UFC 3-101-01, Architecture, and UFC 1-200-02, High Performance Sustainable Building Requirements for additional roofing requirements.

B3010 ROOF COVERINGS

B301001 STEEP SLOPE ROOFING SYSTEMS

Steep slope roofing systems are preferred over low slope roofing systems.

Steep slope roofing systems that are acceptable include standing seam metal.

Provide a roofing system that resists wind uplift pressures calculated in accordance with American Society of Civil Engineers (ASCE) 7. Uplift resistance must be validated by applicable Factory Mutual (FM), Underwriters Laboratories (UL) or American Society for Testing and Materials (ASTM) uplift resistance test procedures. Steel panels must be zinc-coated steel conforming to ASTM A 653/A 653M; aluminum-zinc alloy coated steel conforming to ASTM A 792/A 792M, AZ 55 coating; or aluminum-coated steel.

B301002 LOW SLOPE ROOFING SYSTEMS

Wind Uplift - Provide a complete roof covering assembly rated Class 1- 60, 75, 90, 105, 120, 135 or appropriate in accordance with Factory Mutual (FM) P7825, capable of withstanding an uplift pressure of 135pounds per square foot (with a safety factor of 2), and FM I-49 for perimeter and flashing attachment.

Fire Safety - Provide a complete roof covering assembly:

1. Rated Class A in accordance with ASTM E 108; and

Repair Building Envelope and Interior Finishes, Building 298 WO # N40085-19-F-6882 Building 298, Cherry Point, North Carolina

PART 3 - CHAPTER 6 - Page 634 07/07/2020

2. Listed as part of Fire-Classified roof deck construction in UL

Roofing Materials and Systems Directory (RMSD).

Low slope roofing systems that are acceptable include three-ply built-up roofing systems with modified bitumen cap sheet surfacing.

B301003 ROOF INSULATION AND FILL

Provide roof insulation values no less than in accordance with UFC 1-200- 02, High Performance and Sustainable Building Requirements and UFC 3-110- 03, Roofing.

B301004 FLASHINGS AND TRIM

Flashing and sheet metal work includes scuppers, splash pans, and sheet metal roofing. Flashings must be Pre-Finished material to match roof panels. Finish must be baked-on factory applied color coating of polyvinylidene fluoride (PVF2) or other equivalent fluorocarbon coating with a minimum thickness of 0.8 to 1.3 mils.

B301005 GUTTERS AND DOWNSPOUTS

Provide gutters and downspouts compatible with roofing material and finish.

Concealed (interior) gutters and downspouts are prohibited.

B301006 ROOF OPENINGS AND SUPPORTS

Provide insulated roof hatch and rails or guards.

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