Rouse Life Sciences Roof Repair or Replacement SECTION

Transcription

1 1. PART 1 - GENERAL 1.1 DESCRIPTION OF WORK SECTION STANDING SEAM METAL ROOFING 1. This Section covers the pre-finished, pre-fabricated Architectural standing seam roof system. All metal trim, accessories, fasteners, insulation, and sealants indicated on the drawings as part of this section. 2. Related Work Specified Elsewhere: 1. Refer to all sections in the Standard and special conditions to the ABC documents. See Table of Contents. 2. Joint Sealants 3. Flashing & Sheet Metal 4 Facility Fall Protection 1.2 QUALITY ASSURANCE A. Installer Qualifications: An employer of workers trained and approved by manufacturer. 1. Installer s responsibilities include fabricating and installing metal roof panel assemblies and providing professional engineering services needed to assume engineering responsibility. 2. Engineering responsibility: Preparation of data for metal roof panels, including Shop Drawings, based on testing and engineering analysis of manufacturer s standard units in assemblies similar to those indicated for this project. B. Source Limitations: Obtain each type of metal roof panels through one source from a single manufacturer. C. Product Options: Drawing indicate size, profiles, and dimensional requirements of metal roof panels and are based on the specific system indicated. 1. Do not modify intended aesthetic effects, as judged solely by Architect, except with Architect s approval. If modifications are proposed, submit comprehensive explanatory data to Architect for review. D. Preinstallation Conference: Conduct conference at Project site to comply with ABC requirements for General Conditions or Special Conditions. Review methods and procedures related to metal roof panel assemblies including but not limited to, the following: 1. Meet with Owner, Architect, Owners insurer if applicable, testing and inspecting agency representative, metal roof panels installer, metal roof panel manufacturer s representative, deck installer, and installers whose work interfaces with or affects metal roof panels including installers of roof accessories and roof-mounted equipment. 2. Review and finalize construction schedule and verify availability of materials, Installers personnel, equipment, and facilities needed to make progress and avoid delays. 3. Review methods and procedures related to metal roof panel installation, including manufacturer s written instructions. 4. Examine deck substrate conditions for compliance with requirements, including flatness and attachment to structural members.

2 5. Review structural loading limitations of deck during and after roofing. 6. Review flashings, special roof details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that will affect metal roof panels. 7. Review governing regulations and requirements for insurance, certificates, and testing and inspecting if applicable. 8. Review temporary protection requirements for metal roof panel assembly during and after installation. 9. Review roof observation and repair procedures after metal roof installation. 10. Document proceedings, including corrective measures and actions required, and furnish copy of record to each participant. E. Manufacturer and erector shall demonstrate experience, of a minimum of ten (10) years in this type of project. 1.3 SUBSTITUTIONS 1. The material, products and equipment specified in this section establish a standard for required function, dimension, appearance and quality to be met by any proposed substitution. See Instruction to Bidders Section for Substitution form and procedure. 1.4 ROOF SYSTEM PERFORMANCE TESTING 1. Water Penetration: When tested per ASTM E-283/1680 and ASTM E-331/1646 there shall be no uncontrolled water penetration or air infiltration through the panel joints. 2. Roof System shall be designed to meet Alabama Building Code and 2009 IBC wind load requirements for the specific project location of 90 MPH wind load, Exposure B. 3. Roof System shall be designed to meet a UL Class wind uplift in accordance with UL standard 580 and panel system shall be ASTM 1592 Tested and approved. 1.5 WARRANTIES 1. The Contractor shall warrant for twenty years (20) from the date of substantial completion of the Work related to this section, that the work is not defective in workmanship or material, and that the roof will be adequate to prevent leaks. This warranty may be provided in the short term by the Contractor/Roof Installer, however must have the backing and assurance of the roof system manufacturer. 2. Finish Warranty on Aluminum: Written 20 Year Finish Warranty shall be required for the Aluminum Standing Seam Roof System including Flashings, and related rain-carrying equipment as supplied by the manufacturer and roofing contractor. This warranty will be for 20 Years and cover: Chalking, Fading and Integrity of the Kynar 500 paint finish on the Aluminum. Note this is a Coastal Application with exposure to the ocean and Salt Spray. This 20 Year Finish Warranty shall cover this type of Application and must be signed and executed by the Roofing System manufacturer. 3. Contractor shall provide General Contractor s Roofing Guarantee per ABC Requirements.

3 1.6 PERFORMANCE REQUIREMENTS: A. General: Provide metal roof panel assemblies similar to those indicated for this Project, by a qualified testing and inspecting agency. B. Air Infiltration: Air leakage through assembly of not more than 0.06 cfm/sq. ft. on roof area when tested according to ASTM E 283 at the following test-pressure difference: 1. Positive Preload Test-Pressure differences: greater than or equal to 15.0 lbf.sq. ft. and the greater of 75 percent of building live load or 50 percent of building design positive wind-pressure difference. 2. Negative Preload Test- Pressure Difference: 50 percent of design wind-uplift-pressure difference. C. Water Penetration: No water penetration tested according to ASTM E 331 at the following testpressure difference: 1. Positive Preload Test-Pressure Difference: Greater than or equal to 15.0 lb/sq. ft. and the greater of 75 percent of building live load or 50 percent of building design positive wind-uplift-pressure difference. 2. Negative Preload Test-Pressure Difference: 50 percent of design wind-uplift- pressure difference. D. Wind- Uplift Resistance: Provide metal roof panel assemblies that comply with UL 580 for winduplift resistance class indicated. E. Structural Performance: Provide metal roof panel assemblies capable of withstanding the effects of gravity loads and the following loads and stresses within limits and under conditions indicated, based on testing according to ASTM E 330: 1. Wind Loads: Determine loads based on minimum design wind pressure as indicated on drawings acting inward or outward. F. Seismic Performance: Provide metal roof panel assemblies capable of withstanding the effects of earthquake motions determined according to applicable local code requirements. G. Thermal Movements: Provide metal roof panel assemblies that allow for thermal movements resulting from the following maximum change (range) in ambient and surface temperatures by preventing buckling, opening of joints, overstressing of components, failure of joint sealant, failure of connections, and other detrimental effects. Base engineering calculations on surface temperatures of materials due to both solar heat gain and nighttime-sky heat loss. 1.7 SUBMITTALS: 1. Temperature change (range): 120 deg F, ambient; 180 deg F, material surfaces. A. Product Data: include construction details, material descriptions, dimensions of individual components and profiles, and finishes for each type of metal roof panel and accessories. B. Shop Drawings: Show fabrication and installation layouts of metal roof panels; details of edge conditions, joints, panel profiles, corners, anchorages, trim, flashing, closures, and accessories; and special details. Distinguish between factory-and field-assembled work. 1. For installation products indicated to comply with design loads, include shop drawings signed and sealed by the qualified professional engineer responsible for their preparation.

4 C. Samples for Verification: For each type of exposed finish required, prepared on samples of size indicated below. 1. Metal Roof Panels: 6 inches long by actual panel width. Include fasteners and other exposed accessories. 2. Trim and Closures: 6 inches long. Include fasteners and other exposed accessories. 3. Accessories: 6-inch- long samples for each type of accessory. D. Product Test reports: Based on evaluation of comprehensive tests performed by a quality testing agency, for the following: 1. Metal Roof Panels: Include reports for air infiltration, water penetration and structural performance. E. Maintenance Data: For metal roof panels to include in maintenance manuals. F. Warranties: Special warranties specified in this section. 2. PART 2 - PRODUCTS 2.1 PANEL DESIGN 1. Roof panels shall be standing seam in 16" widths with 1 ¾" high seam. 2.2 ACCEPTABLE MANUFACTURERS 1. Basis of Design: Petersen Aluminum Corporation, Acworth, GA This project is detailed around the roofing product of Petersen Aluminum Corporation, Acworth, GA "SNAP-CLAD" PANEL. 2. Color shall be : "PAC-CLAD" Kynar 500 color: Medium Bronze meeting Energy Star Performance Criteria for Emissivity ASTM C1371 and Reflectivity ASTM C Panel Thickness: Aluminum. 4. Other acceptable Manufacturers, provided with compliance with this specification: A. IMETCO, Tucker, GA Snap-Lock panel. B. Merchant & Evans, Burlington, NJ, 305 panel. C. Berridge Manufacturing Co. D. Centria Roof Systems 2.3 MATERIAL AND FINISHES 1. Face Sheet Material: Aluminum Standing Seam sheet shall be produced from ASTM B-209 quality Aluminum, 3105 H-14 Alloy and Temper material. Aluminum shall be tension leveled (temper passed and stretcher leveled) with camber a maximum of 1/4 inch in 20 feet, manufactured in the USA, and be.040" Thick Aluminum U.S. standard gauge. Product to meet UL-90 Design Standards and shall meet applicable local Building Code for the project location. Alabama Professional Engineer Stamped Calculations will be required for the project to certify the roof panel assembly meets the applicable Building Code wind loads. Engineer Calculations shall be per ASCE 7 latest standards.

5 FINISH 2.. Finish shall be Kynar 500 or Hylar 5000 Flurocarbon coating with a top side film thickness of 0.70 to 0.90 mil over 0.25 to 0.31 mil prime coat to provide a total dry film thickness of 0.95 to 1.25 mil. Bottom side shall be coated with a primer with a dry film thickness of 0.25 mil. Finish shall conform to al tests for adhesion, flexibility and longevity as specified by Kynar 500 or Hylar 5000 finish supplier 1. If Strippable coating shall be applied on the pre-finished panels to the top side to protect the finish during fabrication, shipping and field handling. This strippable coating shall be removed before installation. Note that the Kynar 500 or Hylar 5000 Flurocarbon coating MUST HAVE APPLICABLE LEED RATING AND ENERGYSTAR APPROVAL FOR INITIAL SOLAR REFLECTANCE. For roof slopes of less than 2/12, the Initial Solar Reflectance MUST BE a rating of equal to or greater than a.65 Rating. For roof slopes of 2/12 or greater, the Initial Solar Reflectance MUST BE a rating of equal to or greater than.25. Note that the Kynar 500 or Hylar 5000 Flurocarbon coating MUST HAVE APPLICABLE LEED RATING AND ENERGYSTAR APPROVAL FOR EMISSIVITY. The emissivity rating of this finish must be higher than.80 in emissivity rating. Lower rated colors will not be accepted. 3. Field protection must be provided by the Contractor at the jot site so material is not exposed to weather and moisture. 4. Exposed Flashing and Trim:Unless otherwise specified, all exposed adjacent flashing and trim shall be of the same material and finish as panel system. 5 Forming: Use continuous end rolling method. No end laps on panels. No portable roll forming machines by the installer shall be permitted. Panels shall be "factory manufactured" and "tension-leveled" by the designated manufacturer listed above. 6. Trim: Trim shall be fabricated of the same material and finish to match the profiled sheeting and press broken in lengths of 12 feet. Trim shall be formed only by the manufacturer or their approved dealer. Trim to be erected in overlapped condition. Use lap strips only as indicated on drawings. Miter conditions shall be factory welded material to match the sheeting. 7. Closures: Use composition or metal profiled closures at top of each elevation to close ends of the panels. Metal closures to be made in the same material and finish as face sheet. 8. Panel Clips: Shall be stainless steel as required by the panel manufacturer in appropriate Gage and spacing of Clips to meet the job-specific Wind load. requirements by the Alabama Building Code and 2009 IBC. Necessary engineering documentation of this clip spacing and attachment to be provided in the submittal stage to the Architect. 9. Fasteners: Fasteners shall be 400 series stainless steel, dished washers stainless steel with bonded neoprene. 10. Zees: Where required by design of primary structural framing system shall be used to span between beams and/or joists. Thermally responsive base and top clips shall be fastened to the zees on 12" centers. 11. Insulation: Roof decking and insulation are existing to remain.

6 2.4 ROOFING UNDERLAYMENT (40 MIL Peel & Stick Membrane): On all surfaces to be covered with roofing material, a 40 Mil/60 Mil Thick Peel and Stick Membrane shall be installed over the Plywood Decking. This underlayment shall be a smooth, non-granular underlayment. Acceptable manufacturers: A. GAF Corporation: Metal Mate. B. W.R. Grace: Ice & Water Shield C. Carlisle: CCCW WIP 300HT D. Interwrap: Titanium PSU E. Polyguard: Deck Guard HT or Polyglass HT F. TAMKO Corporation: TW Tile & Metal Underlayment G. Mid-States Asphalt: QUIK-Stick HT Smooth 1. Roofing Underlayment shall be laid in horizontal layers with joints lapped toward the eaves a minimum of 6", and well secured along laps and at ends as necessary to properly hold the underlayment in place. All underlayment shall be preserved unbroken and whole. 2. Roofing Underlayment shall lap all hips and ridges at least 12" to form double thickness and shall be lapped 6" over the metal of any valleys or built-in gutters. 2.5 SEALANTS 1. Provide two part polysulfide class B non-sag type for vertical and horizontal joints, or; 2. One part polysulfide not containing pitch or phenolic extenders, or; 3. Exterior grade silicone sealant recommended by roofing manufacturer, or; 4. One part non-sag, gun grade, exterior type polyurethane recommended by roofing manufacturer. 2.6 FABRICATION 1. Comply with dimensions, profile limitations, gauges and fabrication details shown and if not shown and, if not shown, provide manufacturer's standard product fabrication. 2. Fabricate components of the system in factory, ready for field assembly. 3. Fabricate components and assemble units to comply with fire and performance requirements specified. 4. Apply specified finishes in conformance with manufacturer's standards, and according to manufacturer's instructions.

7 3. PART 3 EXECUTION 3.1 EXAMINATION: A. Examine substrate, areas, and conditions, with installer present, for compliance with requirements for installation tolerances, metal roof panel supports, and other conditions affecting performance of work. B. Examine roughing-in for components and systems penetrating metal roof panels to verify actual locations of penetrations relative to seam locations of metal roof panels before roof panel installation. C. Do not proceed with work until unsatisfactory conditions have been corrected in a manner acceptable to installer. Starting work within a particular area will be construed as applicator s acceptance of surface conditions. 3.2 PREPARATION: A. Clean Substrates of substances harmful to insulation, including removing projections capable of interfering with insulation attachment. B. Substrate Board: Install subsrate boards over metal roof deck on entire roof surface. Attach with substrate-board fasteners. 1. Install substrate board with long joints in continuous straight lines, perpendicular to roof slopes with end joints staggered between rows. Tightly butt substrate boards together. 2. Comply with UL requirements for fire-rated construction C. Install flashings and other sheet metal to comply with requirements and recommendations in SMACNA s Architectural Sheet Metal Manual D. Miscellaneous Framing: Install subpurlins, eave angles, furring, and other miscellaneous roof panel support members and anchorage according to metal roof panel manufacturer s written recommendations. 3.3 INSULATION INSTALLATION; As applicable to substrate repairs of the existing: A. Coordinate installing metal roofing system components so insulation is not exposed to precipitation or left exposed at the end of the workday. B. Comply with insulation manufacturer s written instructions for installing roof insulation. C. Install one or more layers of insulation under area of roofing to achieve required thickness. Where overall insulation thickness is 2 inches or greater, install 2 or more layers with joints of each succeeding layer staggered form joints of previous layer a minimum of 6 inches in each direction. D. Install insulation with long joints of insulation in a continuous straight line with end joints staggered between rows, abutting edges and ends between boards. Fill gaps exceeding ¼ inch with insulation. Cut and fit insulation within ¼ inch of nailers, projections, and penetrations. E. Hold insulation in place with Z-shaped furring members horizontally space 24 inches o.c. Securely attach narrow flanges of furring members to roof deck with screws spaced 24 inches o.c. F. Sheathing: Install sheathing boards over insulation on entire roof surface. Install with long joints perpendicular to roof slope with end joints staggered and attached to Z furring.

8 3.4 UNDERLAYMENT INSTALLATION: A. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle free, on roof sheathing under metal roof panels. Apply primer if required by manufacturer. Comply with temperature restrictions of underlayment manufacturer for installation; use primer rather than nails for installing underlayment at low temperatures. Apply at locations indicated below and at locations indicated on Drawings, in shingle fashion to shed water, with end laps of not less than 6 inches staggered 24 inches between courses. Overlap side edges not less than 3-1/2 inches. Roll laps with roller. Cover underlayment with 14 days. 1. Apply over entire roof surface. B. Apply slip sheet over underlayment before installing metal roof panels. C. Flashing and Trim: Comply with performance requirements, manufacturer s written installation instructions, and SMACNA s Architectural Sheet Metal Manual. Provide concealed fasteners where pos 3.5 METAL ROOF PANEL INSTALLATION: A. General: Provide metal roof panels of full length form eave to ridge, unless otherwise indicated or restricted by shipping limitations. Anchor metal roof panels and other components of the Work securely in place, with provisions for thermal and structural movement. 1. Field cutting of metal roof panels by torch is not permitted. 2. Install panels perpendicular to purlins. 3. Rigidly fasten eave end of metal roof panels and allow ridge end free movement due to thermal expansion and contraction. Predrill panels. 4. Provide metal closures where panels termite. 5. Flash and seal metal roof panels with weather closures at eaves, rakes, and at perimeter of all openings. Fasten with self-tapping screws. 6. Locate and space fastenings in uniform vertical and horizontal alignment. 7. Install ridge and hip caps as metal roof panel work proceeds. 8. Locate panel splices over, but not attached to, structural supports. Stagger panel splices and end taps to avoid a four-panel lap splice condition. 9. Lap metal flashing over metal roof panels to allow moisture to run over and off the material. B. Fasteners: Use stainless-steel fasteners for surfaces exposed to the exterior and galvanized steel fasteners for surfaces exposed to the interior. C. Metal Protection: Where dissimilar metals will contact each other or corrosive substrates, protect against galvanic action by painting contact surfaces with bituminous coating, by applying rubberized-asphalt underlayment to each contact surface, or by other permanent separation as recommended by metal roof panel manufacturer. D. Joint Sealers: Install gaskets, joint fillers, and sealants where indicated and where required for weatherproof performance of metal roof panel assemblies. Provide types of gaskets, fillers, and sealants indicated or, if not indicated, types recommended by metal roof panel manufacturer. 1. Seal metal roof panel end laps with double beads of tape or sealant, full width of panel. Seal side joints where recommended by metal roof panel manufacturer. 2. Prepare joints and apply sealants to comply with requirements in Division 7 Section Joint Sealants. E. Standing-Seam Metal Roof Panels: Fasten metal roof panels to supports with concealed clips at each standing-seam joint at location, spacing and with fasteners recommended by manufacturer. 1. Install clips to Z supports with self-tapping fasteners. 2. Install pressure plates at locations indicated in manufacture s written installation instructions. 3. Snap Joint: Nest standing seams and fasten together by interlocking and completely engaging factory-applied sealant.

9 3.6 ACCESSORY INSTALLATION: A. General: Install accessories with positive anchorage to building and weather tight mounting and provide for thermal expansion. Coordinate installation with flashings and other components. 1. Install components required for a complete metal roof panel assembly including trim, copings, ridge closures, seam covers, flashings, sealants, gaskets, fillers, closure strips, and similar items. B. Flashing and Trim: Comply with performance requirements, manufacturer s written installation instructions, and SMACNA s Architectural Sheet Metal manual. Provide concealed fasteners where possible, and set units true to line and level as indicated. Install work with laps, joints, and seams that will be permanently watertight and weather resistant. 1. Install exposed flashing and trim that is without excessive oil canning, buckling, and tool marks and that is true to line and levels indicated, with exposed edges folded back to form hems. Install sheet metal flashing and trim to fit substrates and to result in waterproof and weather-resistant performance. 2. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. Space movement joints at a maximum of 10 feet with no joints allowed within 24 inches of corner or intersection. Where lapped or bayonet-type expansion provisions cannot be used or would not be sufficiently weather resistant and waterproof, for expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with mastic sealant (concealed within joints). C. Gutters: Join sections with riveted and soldered or lapped and sealed joints. Attach gutters to eave with gutter hangers spaced not more than 4 feet o.c. using manufacturer s standard fasteners. Provide end closures and seal watertight with sealant. Provide for thermal expansion. D. Downspouts: Join sections with 1-1/2-inch telescoping joints. Provide fasteners designed to hold downspouts securely 1 inch away form walls; locate fasteners at top and bottom and at approximately 60 inches o.c. in between. 1. Provide elbows at base of downspouts to direct water away from building. E. Snow Guards: Attach snow guards to metal roof panels with adhesive, sealant, or adhesive tape, as recommended by manufacturer. Do not use fasteners that will penetrate metal roof panels. 1. Provide two rows of snow guards, spaced 12 inches apart, beginning 6 inches up from gutter, with each snow guard centered between panel ribs. F. Pipe Flashing: Form flashing around pipe penetration and metal roof panels. Fasten and seal metal roof panels as recommended by manufacturer. 3.7 ERECTION TOLERANCES: A. INSTALLATION Tolerances: Shim and align metal roof panel units within installed tolerance of ¼ inch in 20 feet on slope and location lines as indicated and within 1/8- inch offset of adjoining faces and of alignment of matching profiles. 3.8 FIELD QUALITY CONTROL: A. Manufacturer s Field Service: Engage a factory-authorized service representative to inspect completed metal roof panel installation, including accessories. Report results in writing. B. Remove and replace applications of metal roof panels where inspections indicate that they do not comply with specified requirements. 3.9 CLEANING AND PROTECTION: A. Remove temporary protective coverings and strippable films, if any, as metal roof panels are installed, unless otherwise indicated in manufacturers written installation instructions. On completion of metal roof panel installation, clean finished surfaces as recommended by metal roof panel manufacturer. Maintain in a clean condition during construction. B. Replace metal roof panels that have been damaged or have deteriorated beyond successful repair. End of Section