Berridge VANTAGE POINT reroofing system combines a new aesthetic look with simple mechanical attachment over existing flat built-up roofs that will last for years to come. VANTAGE POINT is more than just a patchup or a re-roof solution; it is a permanent new roof with a new higher profile which gives your old building a totally new look. The sloped, light weight, self supporting metal panels need no substrate, thus avoiding extra weight and cost. They provide a watertight standing seam that sheds water in contrast to dated, flat built-up roofs which are subject to water ponding and subsequent leakage.

A Retrofit Design Checklist for Architects & Designers:

• Roof Design:

Low slope to steep mansard profile. Intersecting planes such as hips, dormer and valleys should be kept to a minimum.

• Penetrations:

Minimize penetrations such as skylights, curbs for roof-mounted heating or air-conditioning units, etc.

• Insulation:

The space between the old and new roof allows for low cost, blanket insulation to greatly reduce heating and cooling costs.

• Vapor Barrier (if required):

A vinyl vapor barrier on the underside of the blanket insulation avoids condensation from the building penetrating insulation and reaching the framing system and roof panels.

• Mechanical Equipment:

Any existing and new mechanical equipment should be located at ground level to reduce penetrations.

• Ventilation:

The new attic space can be vented with ridge vents or louvers.

• Thermal Movement:

Accomodated at the eaves and with inner rib expansion joints.

VANTAGE POINT SPECIFICATIONS

(To use in your document, select all text, copy <CTRL-C> and paste <CTRL-V>)

SECTION 07610

 PART 1 GENERAL

 1.01 SECTION INCLUDES:

A.   Section Includes:  Preformed and prefinished metal roofing panels, fasteners, clips, perimeter and penetration flashings, closures, insulation, sealant, gutters, seam caps, trim, vapor barriers, expansion joint covers, Retrofit Roof structural subsystem open web framing members, including cold-form track, C-Channel, Framing Sections, Purlins and miscellaneous accessories required to complete the retrofit framing and roofing enclosure as indicated by Contract Documents.

 1.02 RELATED SECTIONS

 A.    Section 05120: Structural Steel Framing.

B.    Section 05500: Miscellaneous metal fabrication.

C.    Section 06100: Rough Carpentry.

D.    Section 07631: Flashing and Sheet Metal Gutters.

E.    Section 07900: Sealants.

1.03 REFERENCES

 A.   American Iron and Steel Institute (AISI), Specification for the Design of Cold-Formed Steel Structural Members (August 1986).

 B.    American Institute of Steel Construction (AISC) Manual of Steel Construction (Current Edition).

 C.   American Society for Testing and Materials (ASTM):

        1.   A446:  Specification for Steel Sheet Zinc-Coated (Galvanized) by the Hot-Dip Process, structural (physical) property.

      2.   A525:  Standard Specification for General Requirements for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process.

      3.   A792: Specification for Steel Sheet, Aluminum-Zinc Alloy-Coated by the Hot-Dip Process.

      4.   E283:  Test Method for Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors.

      5.   E330:  Test Method for Structural Performance of Exterior Window, Curtain Walls, and Doors by Uniform Static Air Pressure Difference.

      6.   E331:  Standard Test Method for Water Penetration of Exterior Windows, Curtain Walls, and Doors by Uniform Static Air Pressure Difference.

 D.    Sheet Metal and Air Conditioning Contractors National Association (SMACNA):

        1.   1987 Architectural Sheet Metal Manual.

 E.             Underwriter’s Laboratories (UL) Building Materials Directory

            1.   UL 580:  Tests for Wind Uplift Resistance of Roof Materials.

 1.04 SYSTEM DESCRIPTION

 A.   Design Requirements:

       1.  Continuous, one-piece, preformed, prefinished, mechanically-seamed, single-length roof pans.

      2.   Panels, Cleats and other components required for specific project conditions.

      2.   Retrofit Roof Framing Structural Subsystem, composed of cold-formed track, c-channel, purlins, framing members and hat sections, designed in accordance with necessary live, wind, dead and existing structural requirements.

      4.    Manufacturer is responsible for providing evidence acceptable to Architect that Manufacturer’s specified roof system is capable of meeting thermal, wind uplift, and performance requirements specified.

 B.    Thermal Movement:

        1.       Completed metal roofing and flashing system shall be capable of withstanding expansion and contraction of components caused by changes in temperature without buckling, producing excess stress of structure, anchors or fasteners, or reducing performance ability.

      2.        Interface between panel and expansion clip shall provide for applicable thermal movement in each direction along the longitudinal direction.

      3.        Location and sizes of metal roofing rigid connectors shall be as indicated on engineer’s certification and located on shop drawings.

 C.    Design Standards:

        1.   Design Loads (Panels, Clips, and Purlins):  Pressures are normal to roof surface in accordance with ANSI A58.1.   Where load tests are required to certify performance, factor of safety shall be 2.5 on panel buckling or on clip-to-panel connections. For Wind Loads, an allowable increase factor of 4/3 may be employed (this results in net factors of safety of 1.875 on panel bending or clip failure from wind loads). Factor of safety for panel capacity for Live Loads shall be 2.0.

      2.   Panel Clip Requirements:  Connection of panel anchor clips to purlins shall be designed to resist loads developed by pressures with proper regard for prying forces and/or bending due to eccentric loading. Performance shall be evaluated at extreme positions of thermal movement. A 1/3 increase in allowable load is permitted for wind pressures. Allowable stresses for design shall be in accordance with specifications in AISI “Cold Formed Steel Design Manual”; factor of safety on testing of connections shall be 2.5.

      3.        Deflection Limits: Installed roof system, including framing and deck, shall carry positive uniform design loads with maximum system deflection of L/240 as measured at rib (web) of panel.

 D.             Performance Requirements:

        1.       Underwriter’s Laboratories, Inc. (UL) Wind Uplift Resistance Classification For Roof Assembly shall be Class 90, as installed, pursuant to Construction Number 312, as defined by UL 580. Certified statements from manufacturer without proper UL Classification will not be acceptable.

      2.         Completed metal roof system, including vapor barrier, shall have maximum static pressure air infiltration of 0.02 cfm/square foot with 6.24 psf air pressure differential when tested in accordance with ASTM E283.

      3.   No measurable water penetration (dynamic pressure), other than condensation, when exposed to dynamic rain and at 6.24 PSF air pressure differential for not less than fifteen minutes duration, when tested in accordance with ASTM E331.

      4.             Calculated pull-out capacities for purlins and fasteners shall be certified by registered professional engineer. Minimum safety factor for anchoring fasteners into metal shall be 2.35. Minimum safety factor for anchoring fasteners into concrete shall be 4.0.

      5.   Entire roofing system (metal panels, flashings, expansion joints, and retrofit roof structural subsystem), are to be detailed to provide weathertight roof under peak weather conditions.

 1.05 SUBMITTALS

 A.    Shop Drawings:  Architectural details show design concept and relationship of retrofit roof to other conditions. It is the responsibility of the Installer to prepare detailed shop drawings that adapt proposed roof system and configuration of roof system to conditions of this Project and specified requirements. Shop drawings shall be reviewed by manufacturer’s Technical Department before submittal to Architect.  Installer shall recommend and make any detail modifications required to insure a proper and watertight system.

       1.   Show retrofit roofing system with structural framing, standing seam panels, flashings and accessories in plan, elevation, sections and details.

     2.   Include metal thicknesses and finishes, panel lengths, joining details, anchorage details, flashings and special fabrication provisions for termination and penetrations. Also indicated purlins and clip locations, cold formed open web framing members,  thermal expansion provisions, and special supports. Submittal shall include manufacturer’s written comments, all fastener descriptions and spacings, sealant description and locations, bend radii, metal thicknesses, and other pertinent information.

     3.   Indicate relationships with existing roof structural framing.

     4.   Distinguish between factory and field assembly work.

     5.   Submit erection drawings showing proposed sequence of laying panels. Provide manufacturer’s instructions for storage, handing, and installation, and their standard construction details for conditions on this Project..

     6.   Shop drawings must be submitted and returned as acceptable prior to beginning field or factory fabrication.

 B.    Product Data:  Submit manufacturer’s detailed material and system description, sealant and closure installation instructions, engineering performance data, and specifications

 C.    Submit a sample of each type of roof panel, complete with factory finish. Submit one (1) sample of each sealant type, indicating location of intended use.

 D.   Quality Control Submittals:

        1.   Design Calculations:

              a.   Submit design calculations sealed by registered engineer indicating compliance with specified performance criteria and certified fastener pullout calculations. Indicate fastener types, spacings and number required for each clip and purlin. Pullout calculations shall be for both purlins and panel clips.

            b.      Empirical calculations for roof panel and clip-to-panel performance will not be accepted.

        2.   Test Reports:

              a.      Submit reports from independent testing laboratory that bears stamp of registered engineer (P.E.) to certify compliance with specified performance criteria.

            b.      Each prequalified manufacturer shall provide complete and current data for specified roof system as follows:

                    1)      Thermal cycle testing of metal roof panels and panel clips as specified.

                  2)      Uniform ultimate wind uplift load capacity test for metal roof panels as specified.

                  3)      Ultimate pull-out capacity for panel clips, tested as specified.

                  4)       UL 90 Classification test data as specified.

                  5)      Model Load Test per ASTM 330 Modified

                  6)      Static air infiltration resistance test data as specified.

                  7)      Water penetration test data as specified.

                  8)      Purlin and fastener pull-out calculations as specified.

        3.       Manufacturer’s Field Reports:

              a.      Submit complete log of field reports prepared by manufacturer.

            b.       Include initial report, progress reports, and final report.

            c.      Submit letter of certification from manufacturer that roof installation is in accordance with shop drawings and manufacturer’s requirements, and that entire roof installation will be issued specified Watertightness Warranty.

1.06 QUALITY ASSURANCE

 A.       Manufacturer:  Company specializing in Architectural Sheet Metal Products with fifteen (15) years minimum experience. Being listed as prequalified manufacturer does not release manufacturer from providing complete, current and acceptable test data for each performance, thermal, and wind load requirement specified for specific profile proposed.

 B.    No product substitutions shall be permitted without meeting specifications.

 C.       Substitutions shall be submitted 10 Days  prior to Bid Date and acceptance put forth in an addendum.

 D.    No substitutions shall be made after the Bid Date.

 E.    Installer Qualifications:

        1.             Preformed metal roof system installer must be an Authorized Installer, and unconditionally acceptable to roof system manufacturer. Manufacturer will determine initial acceptability of installer qualifications for specified roofing systems.

                    a.Submit with Bid complete AIA Document A305 Qualification Form for proposed roofing system installer.

                  b.Architect will determine acceptability of installer prior to award of Contract.

        2.   Installer must have minimum of five (5) years experience installing preformed metal roofing systems.

      3.   Installer must have successfully completed minimum of five (5) significant installations of preformed metal roofing systems, including installation of long, field-formed panels. Submit complete description of each previous project, including name and phone numbers of representatives of the Owner, Architect, Manufacturer, and Contractor.

      4.   Submit name and resume of installer’s proposed job superintendent, including list of similar projects completed by superintendent.

      5.   Architect reserves right to inspect fabrication facilities of installer in determining qualifications.

      6.   Installer must execute 100% of metal roof system installation with installers own employees.

 F.    Pre-Installation Conference:

        1.   Conduct pre-installation meeting at Project Site before each construction activity that required coordination with installation of preformed metal roofing system.

      2.   Other trades involved in or affected by installation of metal roof system shall attend.

      3.   Advise Architect of scheduled meeting dates minimum of three (3) days in advance.

      4.   Review progress of other construction activities and preparations for particular activity under construction at each pre-installation conference.

      5.   Record significant discussions and agreements/disagreements of each conference, along with approved schedule. Distribute record of meeting to everyone concerned, promptly, including Owner and Architect.

      6.   Do not proceed if conference cannot be successfully concluded. Initiate whatever actions are necessary to resolve impediments to performance of Work and reconvene conference at earliest feasible date.

 1.06 DELIVERY, STORAGE, AND HANDLING

 A.    Deliver prefabricated accessories to Project site in manufacturer’s unopened containers.

 B.    Protect components during shipment, storage, handling, and erection from mechanical abuse, stains, discoloration and corrosion.

C.    Provide protective interleaving between contact areas of exposed surfaces to prevent abrasion during shipping, storage and handling.

 D.    Store materials off ground, providing for drainage, under cover providing for air circulation, and protected from wind movement, foreign material contamination, mechanical damage, cement, lime, or other corrosive substances.

 E.    Provide covered storage off ground on Project Site for storage of prefinished metal coils. Maintain availability of equipment on site to off-load and store metal coils as they are delivered to Project Site.

F.    Handle materials to prevent damage to surfaces, edges and ends of roofing sheets, sheet metal items and substructural framing members.  Damaged material shall be rejected and removed from site.

 G.    Protect field fabricated panels from wind-related damage. Provide on-site storage, or other acceptable protection, for fabricated panels prior to installation.

 H.   Examine materials upon delivery. Reject and remove physically damaged, stained  or marred material from project site.

 I.     Panels with strippable film must not be stored in the open exposed to the sun.

 J.     Stack all materials to prevent damage and to allow for adequate ventilation.

 1.07 SITE CONDITIONS

 A.    Determine that work of other trades will not hamper or conflict with necessary fabrication and storage requirements for preformed metal roofing system.

 B.    Protection:

        1.   Provide protection or avoid traffic on completed roof surfaces.

      2.   Do not overload roof with stored materials.

      3.   Support no roof-mounted equipment directly on roofing system.

 C.    Determine that work of other trades which penetrate roof or is to be made watertight by roof is in place and accepted prior to installation of roofing system.

 D.    Smoking is prohibited on roof areas.

1.08 SCHEDULING

 A.    Coordinate staging and setup area required for field fabrication equipment provided by metal roofing manufacturer.

 B.   Provide temporary equipment (cranes, hoists, forklifts) in accordance with provisions of Division One.

 1.09 WARRANTIES

 A.    Furnish manufacturer’s Standard Twenty (20) Year Warranty stating architectural fluorocarbon coating finish will be:

        1.   Free of fading or color change in excess of 2 NBS units as measured per ASTM D 2244-68;

      2.   Will not chalk in excess of numerical rating of 8 when measured in accordance with standard procedures specified in ASTM D 659-74;

      3.   Will not peel, crack, chip or exhibit any other mechanical failure of paint to adhere to the substrate.

B.    Provide Watertightness Warranty executed jointly by the roof system manufacturer and installer which warrants the installed system to be free of leaks and free from defects in materials and workmanship for a period of twenty (20) years from date of substantial completion of roofing project.

1.10 SUBSTITUTIONS:

 A.    Substitution of manufacturer’s products for those specified will not be allowed at any time during bidding or construction.

PART 2:   PRODUCT

2.01 ACCEPTABLE MANUFACTURERS

 A.    Berridge Manufacturing Company, Houston, Texas. 713-223-4971 / 1-800-231-8127

 B.     Substitutions shall fully comply with specified requirements.

2.02 SHEET MATERIALS

 A.    Unfinished metal shall be ASTM A446-85 Grade C G90 Coating, ASTM 525-86 Hot-Dipped Galvanized,  or Galvalume ASTM 792-86.

 B.    Prefinished metal shall be Hot-Dipped Galvanized ASTM A446-85 Grade C G90 Coating A525-86 24 Gauge core steel or prefinished Galvalume ASTM 792-86.

 C.    Finish shall be 70% Kynar 500 Fluorocarbon coating, applied by the manufacturer on a Continuous Coil Coating Line, with a top side dry film thickness of 0.70 to 0.90 mil over 0.25 to 0.35 mil prime coat, to provide a total dry film thickness of 0.95 to 1.25 mil. Bottom side shall be coated with primer with a dry film thickness of 0.25 mil. Finish shall conform to all tests for adhesion, flexibility, and longevity as specified by the Kynar 500 finish supplier.

 D.    Strippable film shall be applied to the top side of the painted coil to protect the finish during fabrication, shipping and field handling. This strippable film must be removed before installation.

2.03 STRUCTURAL SUBSYSTEM FRAMING MATERIALS

 A.    Framing:  Top and Bottom Chords and Open Web Framing Members to be made up from cold-form Track, C-Channel and Framing Members of an optimum size to minimize overall subsystem dead load weight upon existing roof and building structure.  Longitudinal Hat Section Purlins which conform to roof slope to be provided for attachment of continuous rib roof cleats.

 B.    Material:  24, 22, 16, 14 or 12-Gauge Hot Dipped G-90 Coating Galvanized Steel, Grade C ASTM 525-86.

2.04 ACCESSORY MATERIALS

 A.    Fasteners:  Stainless Steel with washers where required.

 B.    Sealant:  As specified in Section 07900[             ] Type.

2.04 FABRICATION:

 A.    All exposed adjacent flashing shall be of the same material and finish as the roof panels.

 B.    All flashings, hem exposed edges on underside 1/2 inch.

 C.    All retrofit roof structural subsystem framing materials to be pre-cut to required length and piecemarked to facilitate assembly.

2.05 PREFORMED METAL ROOFING SYSTEM:

 A.    Zee-Lock Standing Seam Roof System:

        1.   2" high vertical legs shall be spaced at 16" on-center.

      2.   Panels shall be site-formed with the Berridge Model SP-21-X Portable Roll Former in continuous lengths from ridge to eave or factory-formed in continuous lengths (maximum 40'-0")

      3.     Continuous Zee Rib shall be 1-3/8" wide and 2-1/8" in height.  Rib shall be connected to purlin with two #12-14 x 1"  self-drilling/tapping fasteners [Zee Clips spaced at 3'-0"].

      4.   Optional Vinyl Weatherseal  (U.S. Patent 5134825) to be factory-installed over Continuous Zee Rib.

      5.   Sidelap to be machanically seamed with a powered seamer.

      6.   When required, panel assembly to bear Underwriters Laboratories   Label UL90, pursuant to Construction Number 312  for open framing conditions, either uninsulated or with blanket insulation; 335 or 335 (mod.) with rigid board insulation or 403 over solid substrate and applicable Fire Ratings.

      7.     Certification shall be submitted, based on independent  testing laboratory, indicating no measurable water penetration or air leakage through the system when tested in accordance with ASTM E-331-86 and E-283-84.

 B.    Cee-Lock Standing Seam Roof System:(recommended for solid sheathing):

        1.  Panels shall have 1-½” high vertical legs, spaced 16-½” on center.

      2.   Standing seam to be of an interlocking, “snap-lock” design.

      3.   Panels shall be site-formed with the Berridge Model CL-21 Portable Roll Former in continuous lengths from ridge to eave or factory-formed  to maximum 40'-0".

      4.    Continuous Cee Rib to be 1-3/8" wide and 2-1/8" in height.   Rib shall be connected to purlin with two #12-14 x 1"  self-drilling/tapping fasteners [Cee-Clips at 3'-0" max.].

      5.   Optional Vinyl Weatherseal  (U.S. Patent No. 4641475) to be factory/machine-installed over Continuous Cee Rib.

      6. When required, Panel assembly to bear Underwriter’s Laboratories Label UL90, pursuant to Construction Number 334 and applicable Fire Ratings.

      7. Certification shall be submitted, based on independent  testing laboratory, indicating no measurable water penetration or air leakage through the system when tested in accordance with ASTM E-331-86 and E-283-84.

C.    Batten Seam Roof System:

        1.   Panel and Battens shall be spaced at 16" on-center.

      2.   Panels shall be site-formed with the Berridge model BP-21 Portable Roll Former in continuous lengths from ridge to eave or factory fabricated to 40'-0" max.

      3.   Snap-On Battens shall be 2" wide and 1 3/4" in height.[Nominal installed height of 2"]. Battens shall be roll-formed.

      4.    Attachment to structural supports with 3-1/2" Cadmium Plated screws through the hidden Batten Clip and the top crown of the Deep Vee Panel. Maximum spacing 50" on center for open span structural supports.Intermediate Batten Clips attached through the top crown of the Deep Vee Panel, 20" on center maximum with  #10 x 3/4" TEK screws.

      5.   Attachment to solid sheathing shall be with 3-1/2" long ring   shank Galvanized roofing nails through the hidden  Batten Clip and the top crown of the Deep Vee Panel  spaced 20" on center.

      6.   Two Batten Clips shall be used at the eaves and on both sides of the miter at change of slope.

      7.   When required, panel assembly shall bear Underwriter’s Laboratories Label UL90, pursuant to Construction Number 262.

   D.   Concealed Continuous Anchor Ribs:

      1.      Standing seam metal roof shall be fastened to framing members with concealed anchor ribs of minimum G-90 galvanized steel or stainless steel or other properly coated metal of adequate strength and wear resistance to meet or exceed minimum performance requirements of this specification.

      2.   Ribs shall accompany panel movement in each direction along longitudinal direction to adequately accommodate temperature differential and panel movement for this Project.

      3.      Manufacturer shall design fastener device and spacing of fasteners to maintain required wind uplift resistance at connection.

 E.    All exposed adjacent flashing shall be of the same material and finish as the roof panels.

 F.    All flashings, hem exposed edges on underside 1/2 inch.

 G.    Fasteners:

        1.   Exposed screw fasteners shall be 300 series alloy stainless steel with integrally bonded neoprene stainless steel washers under the heads, painted with urethane finish to match roofing.

      2.       Exposed rivets shall be self-plugging type minimum 3/16" diameter 300 series alloy stainless steel with stainless steel stems. If located where drainage from possible head leakage does not pass to interior, seal washers are not required, other wise, use EPDM washers under the heads.

      3.    Concealed fasteners shall be #12 size to meet pullout requirements in specific thickness of support material.

      4.   There shall be no exposed fasteners except to fasten flashings, at fixing points, or as indicated on the drawings.

 H.    Closures:

        1.   Ridge and hip closures shall be factory-fabricated from 24 ga. sheet metal matching roof panels. Hip closures shall be field cut. Ridge Closures are to be die-formed to match panel configuration.

 I.     Sealants:

        1.   Must not contain oil, asbestos or asphalt.

      2.   Factory-applied sidelap sealant:  Non-drying non-skinning, synthetic polymer-based, designed for metal-to-metal concealed joints. Spectrum 1 by Tremco or equal.

2.06 FABRICATION:

 A.    Panels:

        1.   Panels shall be fabricated on site in continuous lengths as required. No horizontal overlap joints are permitted in roof panel lengths.

      2.   Provide pans in full lengths from peak to eave as indicated.

      3.   Transverse or endlap seams will not be permitted.

      4.   Design panels to use concealed fasteners. Exposed fasteners in roofing pans will not be permitted.

      5.    Standing seam must prevent water capillary action, or otherwise prevent water infiltration.

      6.       Examine panels as they are formed to ensure panels are being formed within acceptable tolerances.

 B.    Fabricate roofing and related sheet metal work in accordance with accepted shop drawings and applicable standards.

 C.    Provide linear sheet metal items in minimum 10'-0" sections except as otherwise noted. Form flashing using single pieces for full width. Provide shop fabricated, mitered and joined corners.

 PART 3:  EXECUTION

 3.01 INSPECTION:

A.    Examine alignment of roof structure retrofit structural framing subsystem before proceeding with installation of preformed metal roofing.

B.    Examine metal roof deck before starting installation. Deck must be clear, clean and smooth, free of depressions, waves, or projections, dry and must remain dry and free of ice and snow, after roofing application commences. Deck flutes must be clean and dry.

 C.    Structural supports shall be in place and sag rods, diagonal bracing, and connections shall be tightened before work can proceed.

 D.    Field check dimensions and check support alignment with taut string or wire. Support misalignment will cause panel to oil can.

 E.    Do not proceed with installation until conditions are satisfactory. Notify Architect in writing of unsatisfactory conditions.

 F.    Felting (for installation over solid substrate):

        1.   Verify #30 unperforated asphalt saturated roofing felt underlayment (in single layer, weather-lapped head 6", ends 18") has been installed over areas where solid sheathing is required and fastened in place.

      2.   Ensure felt installed horizontally, starting at eave to ridge with a 6" minimum overlap.

      3.   Ensure that all fasteners are totally flush with the substrate.

3.02  INSTALLATION:

 A.    General Installation Requirements:

        1.   Install roofing and flashings in accordance with accepted shop drawings and manufacturer’s product data, within specified tolerances.

      2.   Isolate dissimilar metals and masonry or concrete from metals with bituminous coating. Use gasketed fasteners where required to prevent corrosive action between fastener, substrate and panels.

      3.   Limit exposed fasteners to extent indicated on shop drawings.

      4.    Anchorage shall allow for temperature expansion and contraction movement without stress or elongation of panels, clips, or anchors. Attach clips to structural substrate using fasteners of size and spacing as determined by manufacturer’s design analysis to resist specified uplift and thermal movement forces.

      5.    Coordinate flashing and sheet metal work to provide weathertight conditions at roof terminations. Fabricate and install in accordance with standards of SMACNA Manual using continuous cleats at all exposed edges.

 B.             Underlayment:

        1.    Assemble Retrofit open web framing members with necessary bracing as indicated on manufacturer shop drawings.

      2.   Install Retrofit Hat Section Purlins, spaced as indicated on plans.

C.    Preformed Metal Panels:

        1.   Fasten clips with fasteners as recommended by manufacturer and at spacings as required for wind uplift.

      2.   Verify with manufacturer locations of fixed connections and expansion connections.

      3.   Roll form panels on site  with Portable Roll Former in continuous, eave to ridge lengths. Take care to properly support long panels (support at max. 6' intervals).

      4.   Install starter and edge trim before installing roof panels.

      5.   Remove protective strippable film prior to installation of roof panels.

      6.   Install panels to either Continuous  Clips per manufacturer’s details.

      7.   Vinyl Weatherseal  is factory-installed on Continuous Clip.

      8.   Seam Panel sidelaps using power-driven Seamer as recommended by manufacturer to ensure watertightness.

      9.   Erect metal roofing with lines, planes, rises and angles sharp and true, and plane surfaces free from objectionable wave, warp, dents, buckle or other physical defects with minimum oil canning.

      10.  Do not allow traffic on completed roof.  If required, provide cushioned walk boards.

      11.  Protect installed roof panels and trim from damage caused by adjacent construction until completion of installation.

      12.  Remove and replace any panels or components which are damaged beyond successful repair.

 D.    Flashing:

        1.   Comply with SMACNA “Architectural Sheet Metal Manual” recommendations for installation of work.

      2.   Conceal fasteners and expansion provisions wherever possible.

      3.   Fold back edges of concealed side of exposed edge to form hem.

      4.   Insert metal flashings into reglets, anchor with fasteners and wedges and seal joints.

      5.   Set sheet metal items level, true to line, and plumb.

      6.   Secure to wood with screws.

      7.   Set metal already partly formed in place and fasten to by means of cleats.

      8.   Use cleats to keep laps closed when face width exceeds 8" for 24 gauge steel.

 3.03 FIELD QUALITY CONTROL:

A.    Tolerances:

        1.   Applicable erection tolerances:  Maximum variation from true planes or lines shall be 1/4" in 20' - 0", 3/8" in 40' -0" or more.

      2.   Retrofit Roof Structural Roof Structural Subsystem are designed for minimum roof slope of 1/2:12 (refer to roof plans for areas and slope).

 B.             Manufacturer’s Field Service:

        1.      Manufacturer’s representative shall be present at each pre-installation and pre-roofing conference, and during set-up of manufacturer’s field forming equipment.

      2.   Jointly examine roof structure with installer prior to beginning roof installation.

      3.    Manufacturer’s representati