NAVFAC Design-Build Model Request for Proposal - Magazine

B30 GENERAL

RFP Part 3 including the Engineering System Requirements (ESR) provide project specific requirements.  The RFP Part 4, Performance Technical Sections (PTS) provide generalized technical requirements that apply to multiple facility types and include more requirements than are applicable to any one project. Therefore, only the RFP Part 4 requirements that apply to the project and further define the RFP Part 3 project specific requirements are required.

B30 1.1 DESIGN GUIDANCE

Provide the design and installation in accordance with the following references.  This Performance Technical Specification (PTS) adds clarification to the fundamental requirements contained in the following Government Standards.  The general requirements of this PTS section are located in PTS Section Z10, General Performance Technical Specification.

Industry standards, codes, and Government standards that are referenced in the section text that are not found in the Unified Master Reference List (UMRL) in the Federal Facility Criteria (FFC) at the Whole Building Design Guide (WBDG) website, are listed below for basic designation identification. Comply with the required and advisory portions of the current edition of the standard at the time of contract award.

B30 1.1.1 Government Standards

UNIFIED FACILITIES CRITERIA (UFC)

B30 1.1.2 Design Requirements

Wind Uplift Resistance: Determine the required wind uplift resistance based on American Society of Civil Engineers (ASCE) ASCE/SEI 7 wind loading calculations or applicable building code requirements and UFC 3-101-01 Architecture and UFC 3-110-03 Roofing. The specified Factory Mutual (FM) rating incorporates a safety factor of 2 over the maximum calculated uplift pressure. Therefore, a FM rating of 1-90 correlates to a maximum uplift calculation of 2.2 kPa, 45 psf. When a rated system is specified, ensure the specified roof system is capable of meeting the wind uplift resistance specified. Where non-rated systems may be allowed and used, delineate calculated values in the roof specification or drawings. Utilize independently tested and rated roof systems, such as Factory Mutual (FM), Underwriters Laboratory (UL), and Single Ply Roofing Industry (SPRI).

The complete roof system assembly must be rated and installed to resist wind loads calculated in accordance with ASCE/SEI 7 and validated by uplift resistance testing in accordance with Factory Mutual (FM) test procedures. Non-rated systems must not be installed, except as approved by the Contracting Officer. Submit licensed engineer's wind uplift calculations and substantiating data to validate any non-rated roof system.

B30 1.2 CONSTRUCTION SUBMITTALS

Submit construction submittals in accordance with PTS Section Z10, General Performance Technical Specifications.  In addition to the Z10 requirements, the Designer of Record (DOR) must approve the following submittals as a minimum:

Test reports, color samples, certificates of conformance, warranties, close out documentation, and manufacturer's instructions for application and installation on all products used on the roof. Products used on the roof consist of but are not limited to structural deck, insulation, membrane or panels, Standing Seam Metal Roofing (SSMR), flashing, fasteners, nailers, accessories and equipment support curbs or equipment support stands for solar equipment, equipment roof plan, maintenance access and paths.

B3010 ROOF COVERINGS

Roof coverings consist of structural deck roof and fascia panels, flashing, fasteners, nailers, and accessories and must comply with the requirements of UFC 3-110-03, Roofing, and NRCA, Roofing and Waterproofing Manual found at http://www.nrca.net/rp/technical/manual/manual.aspx as the primary NAVFAC roofing criteria.  The earth covered portion of the magazine is covered in PTS section ?????.

B301001 STEEP SLOPE ROOF SYSTEMS

Slope conversions from low slope to steep slope roofing systems must specifically address temporary waterproofing protection where new framing connections penetrate the existing low slope system.

B301001 1.1 STRUCTURAL METAL ROOFING SYSTEM

B301001 1.1.1 Structural Metal Roof

The structural metal roof covered under this specification must include the entire roofing system; the metal roof panels, fasteners, connectors, roof securement components, and assemblies tested and approved in accordance with ASTM E 1592.  This includes exterior gutters and downspouts; eaves, ridge, gable, wall, or other roof system flashings installed and any other components specified within this contract to provide a weathertight roof system.

B301001 1.1.2 Performance Requirements

NOTE:  Testing is required to verify the adequacy of the SSSMR system.  External reinforcement of panel seams is not permitted, except when approved by the customer and the designer.  Consider the use of closer purlin spacing and narrow width panels (12 inches (305 mm)) in order to eliminate the need for external reinforcement.  External reinforcement includes clips, and clamps on the ribs or seams.

1. Provide a galvanized structural metal roof systems as defined on the definitive drawings.
   
   1) Manufacturer's Material Warranties

NOTE:  The 20-year system weather tightness warranty, required in paragraph c. below, will increase construction cost, and should be used only after consultation with the customer.

Furnish, in writing, the following manufacturer's material warranties which cover components such as roof panels, anchor clips and fasteners, flashing, accessories, and trim, fabricated from coil material:

a)  A manufacturer's 20-year material warranty warranting that the aluminum, zinc-coated steel, aluminum-zinc alloy coated steel or aluminum-coated steel as specified herein will not rupture, structurally fail, fracture, deteriorate, or become perforated under normal design atmospheric conditions and service design loads.  Liability under this warranty must be limited exclusively to the cost of either repairing or replacing nonconforming, ruptured, perforated, or structurally failed coil material.

b)  A manufacturer's 20-year exterior material finish warranty on the factory colored finish warranting that the finish, under normal atmospheric conditions at the site, will not crack, peel, or delaminate; chalk in excess of a numerical rating of eight, as determined by ASTM D 4214 test procedures; or change color in excess of five CIE or Hunter Lab color difference (delta E) units in accordance with ASTM D 2244.  Liability under this warranty is exclusively limited to refinishing with an air-drying version of the specified finish or replacing the defective coated material.

c)  A roofing system manufacturer's 20 year, non-prorated, system weather tightness warranty.

B301001 1.1.3 Roof Panels

NOTE:  See TI 809-29 for guidance on roof slope and height of seams.

Panels must be steel and have a factory color or galvanized finish.  Length of sheets must be sufficient to cover the entire length of any unbroken roof slope for slope lengths that do not exceed 30 feet.

NOTE:  When a factory color finish is specified, paragraph "2." does not apply.  AZ 50 coating is allowed for factory-color-finish and not for mill finish.  These two paragraphs do not apply when steel panels are not used in the project.

1. Steel panels
   
   Provide zinc-coated steel panels conforming to ASTM A 653/A 653M; aluminum-zinc alloy coated steel conforming to ASTM A 792/A 792M, AZ 55 or 50 coating;
   
   1)  Prior to shipment, if the panels are not specified with a factory color finish, mill finish panels must be treated with a passivating chemical to inhibit the formation of oxide corrosion products. Panels that have become wet during shipment and have started to oxidize will be rejected.

B301001 1.1.4 Accessories

Flashing, trim, metal closure strips, caps and similar metal accessories must be the manufacturer's standard products.  Exposed metal accessories must be finished to match the panels furnished.

B301001 1.1.5 Fasteners

NOTE:  Fasteners that are not color coated may be limited to 400-series corrosion resisting steel when justified by atmospheric exposure conditions.

Fasteners for steel roof panels must be zinc-coated steel, aluminum, corrosion resisting steel, or nylon capped steel, type and size specified below or as otherwise approved for the applicable requirements.  Fasteners for aluminum roof panels must be aluminum or corrosion resisting steel.  Fasteners for structural connections must provide both tensile and shear ultimate strengths of not less than 750 pounds per fastener.  Exposed roof fasteners must be sealed or have sealed washers on the exterior side of the roof to waterproof the fastener penetration.  Washer material must be compatible with the roofing; have a minimum diameter of 3/8 inch for structural connections; and gasketed portion of fasteners or washers must be neoprene or other equally durable elastomeric material approximately 1/8 inch thick.  Exposed fasteners for factory color finished panels must be factory finished to match the color of the panels.

1. Screws - Screws for attaching anchor devices must not be less than No. 14
2. Bolts - Bolts must not be less than 1/4 inch diameter, shouldered or plain shank as required, with locking washers and nuts.

B301001 1.1.6 Factory Color Finish

Panels must have a factory applied polyvinylidene fluoride finish on the exposed side.  The exterior finish must consist of a baked-on topcoat with an appropriate prime coat.  The exterior coating must be a nominal 2 mil thickness consisting of a topcoat of not less than 0.7 mil dry film thickness and the paint manufacturer's recommended primer of not less than 1.0 mil thickness.  The interior color finish must consist of the same coating and dry film thickness as the exterior.  The exterior color finish must meet the test requirements specified below.

1. Salt Spray test - A sample of the sheets must withstand a cyclic corrosion test for a minimum of 2016 hours in accordance with ASTM D 5894, including the scribe requirement in the test.  Immediately upon removal of the panel from the test, the coating must receive a rating of not less than 10, no blistering, as determined by ASTM D 714; 10, no rusting, as determined by ASTM D 610; and a rating of 6, over 21/16 to 1/8 inch failure at scribe, as determined by ASTM D 1654.


NOTE:  The results of the salt spray test will vary depending on the thickness of the coating.


2. Formability Test - When subjected to testing in accordance with ASTM D 522 Method B, 1/8 inch diameter mandrel, the coating film must show no evidence of cracking to the naked eye.
3. Humidity Test - When subjected to a humidity cabinet test in accordance with ASTM D 2247 for 1000 hours, a scored panel must show no signs of blistering, cracking, creepage or corrosion.
4. Impact Resistance - Factory-painted sheet must withstand direct and reverse impact in accordance with ASTM D 2794 0.500 inch diameter hemispherical head indenter, equal to 1.5 times the metal thickness in mils, expressed in inch-pounds, with no cracking.
5. Abrasion Resistance Test - When subjected to the falling sand test in accordance with ASTM D 968, Method A, the coating system must withstand a minimum of 2.83 cubic feet (80 liters) of sand before the appearance of the base metal.  The term "appearance of base metal" refers to the metallic coating on steel or the aluminum base metal.

B301001 1.1.7 Sealant

Sealants must be elastomeric type containing no oil or asphalt.  Exposed sealant must be colored to match the applicable building color or clear and must cure to a rubber like consistency.  Sealant placed in the roof panel standing seam ribs must be provided in accordance with the manufacturer's recommendations.

B301004 FLASHINGS & TRIM

B301004 1.1 FLASHING AND SHEET METAL

This paragraph covers the requirements for flashing and sheet metal work including scuppers, splash pans, and sheet metal roofing.  Provide flashing and sheet metal in accordance with roof manufacturer’s printed installation instructions and in compliance with NRCA and SMACNA recommendations.

B301004 1.1.1 Materials

Furnish sheet metal items in minimum 8 to 10 foot (2.44 to 3.05 meter) lengths. Sheet metal items include the following: gutters, including hangers; downspouts; counter-flashings; gravel stops and fascias; cap, valley, stepped, base and eave flashings and related accessories.

1. Copper, Sheet and Strip - ASTM B 370, cold-rolled temper.
2. Lead-Coated Copper Sheet - ASTM B 101
3. Lead Sheet - Minimum weight 4 pounds per square foot (.19 kPa).
4. Steel Sheet, Zinc-Coated (Galvanized) - ASTM A 653/ A 653M.  Galvanized steel items must have a baked-on, factory applied finish of polyvinylidene fluoride or an equivalent fluorocarbon coating with a minimum thickness of 0.8 to 1.3 mils.
5. Stainless Steel - ASTM A 167, Type 302 or 304, 2D finish, fully annealed, dead-soft temper.
6. Aluminum Alloy Sheet and Plate - ASTM B 209
7. Pre-Finished Aluminum - Provide trim, gravel stops and fascias of Pre-finished aluminum.  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.
8. Aluminum alloy, Extruded Bars, Rods, Shapes, and Tubes - ASTM B 221
9. Solder - ASTM B 32
10. Polyvinyl Chloride Reglet - ASTM D 1784, Type II
11. Asphalt Primer - ASTM D 41
12. Fasteners - Fasteners must be of the same or compatible metal with the item being fastened. Stainless steel fasteners must be used to fasten dissimilar materials.

B301004 1.1.2 Field Quality Control

Fabrication and installation of sheet metal items must be as follows:

1. Install work with watertight and hairline joints, without waves, warps, buckles, fastening stresses, or distortion, allowing for expansion and contraction.
2. Make surfaces to receive sheet metal plumb and true, clean, even, smooth, dry and free of defects and projections that could affect the application.
3. Provide sheet metal flashing in angles formed where roof decks abut walls, curbs, ventilators, pipes, or other vertical surfaces and wherever indicated and necessary to make the work watertight.
4. Provide prefabricated inside and outside corners at all sheet metal intersection pieces.  Minimum leg length must be 12 inches (300 mm), maximum length must be 18 inches (450 mm).
5. Fabricate sheet metal to conform to the contours of surfaces to which applied.
6. All sheet metal cap flashings must have waterproof membrane underlayment installed behind or below the metal components.
7. Provide conforming sheet metal closures at all flashing termination conditions.
8. Provide fastenings and accessories as required to provide a securely attached, watertight construction.  Cleats must be a minimum of one gage heavier than the component to be attached.
9. Where sheet metal components are to be embedded in the roofing system, prime both sides of all metal flanges prior to installation.

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