Thermoplastic-polyolefin (TPO) Roofing

Correspondence Please direct any questions to: Jon T. Bossey Facilities Director Belknap County Commissioners Office 603-737-2391 jbossey@belknapcounty.gov The County of Belknap Reserves the Right to Accept or Reject All Bids or Any Part Thereof, to Waive Any Formality in the Bidding Process and to Accept the Bid Considered to Be in the Best Interest of the County. Failure to Give All Information Called for May Be Sufficient Grounds for Disqualification. The County Reserves the Right to Cancel This Bid Request at Any Time for Any Reason. General Overview the County of Belknap is Replacing Sections of Roofing Over the Belknap County Nursing Home and Belknap County Department of Corrections. The Sections Over the Nursing Home is Fully Adhered Rubber Membrane System. The Section Over the Department of Corrections is a Fully Ballasted System. The Expected Start Date is to Be Whenever the Weather Allows in the Spring of 2024. Roofing Proposed Shall Follow the Following Specifications. 1.1 Warranty a. Special Warranty: Manufacturer Agrees to Repair or Replace Components of Roofing System That Fail in Materials or Workmanship Within Specified Warranty Period. 1. Warranty Period: 30 Years From Date of Substantial Completion. Part 2 - Products 2.1 Performance Requirements a. Accelerated Weathering: Roof Membrane Shall Withstand 2000 Hours of Exposure When Tested According to Astm G152, Astm G154, or Astm G155. B. Impact Resistance: Roof Membrane Shall Resist Impact Damage When Tested According to Astm D3746, Astm D4272, or the "Resistance to Foot Traffic Test" in Fm Approvals 4470. C. Wind Uplift Resistance: Design Roofing System to Resist the Following Wind Uplift Pressures Per Asce7 as Noted on S0.2. D. Energy Star Listing: Roofing System Shall Be Listed on the Doe's Energy Star "Roof Products Qualified Product List" for Low-slope Roof Products. E. Exterior Fire-test Exposure: Astm E108 or Ul 790, Class a; for Application and Roof Slopes Indicated; Testing by a Qualified Testing Agency. Identify Products With Appropriate Markings of Applicable Testing Agency. F. Fire-resistance Ratings: Comply With Fire-resistance-rated Assembly Designs Indicated. Identify Products With Appropriate Markings of Applicable Testing Agency. 2.2 Thermoplastic Polyolefin (Tpo) Roofing a. Tpo Sheet: Astm D6878/d6878m, Internally Fabric- or Scrim-reinforced, Fabric-backed Tpo Sheet. 1. Firestone Building Products: Ultra Ply Platinum Tpo Membrane 2. Thickness: 80 Mils (2.0 Mm), Nominal. 3. Exposed Face Color: White 2.3 Auxiliary Roofing Materials a. General: Auxiliary Materials Recommended by Roofing System Manufacturer for Intended Use and Compatible With Other Roofing Components. 1. Adhesive and Sealants: Comply With Voc Limits of Authorities Having Jurisdiction. B. Sheet Flashing: Manufacturer's Standard Unreinforced Tpo Sheet Flashing, 55 Mils (1.4 Mm) Thick, Minimum, of Same Color as Tpo Sheet. C. Prefabricated Pipe Flashings: as Recommended by Roof Membrane Manufacturer. D. Bonding Adhesive: Manufacturer's Standard E. Slip Sheet: Manufacturer's Standard, of Thickness Required for Application. F. Metal Termination Bars: Manufacturer's Standard, Predrilled Stainless Steel or Aluminum Bars, Approximately 1 by 1/8 Inch (25 by 3 Mm) Thick; With Anchors. G. Fasteners: Factory-coated Steel Fasteners and Metal or Plastic Plates Complying With Corrosion-resistance Designed for Fastening Roofing Components to Substrate, and Acceptable to Roofing System Manufacturer. H. Miscellaneous Accessories: Provide Pourable Sealers, Preformed Cone and Vent Sheet Flashings, Preformed Inside and Outside Corner Sheet Flashings, T-joint Covers, Lap Sealants, Termination Reglets, and Other Accessories. 2.4 Roof Insulation a. Polyisocyanurate Board Insulation: (Type 8) Astm C1289, Type Ii, Class 1, Grade 2, Felt or Glass-fiber Mat Facer on Both Major Surfaces. 1. Firestone Building Products: Iso 95+ 2. Thermal Resistance: R 5.7 Per Inch 3. Size: 48 by 48 Inches (1219 by 1219 Mm) or 48 by 96 Inches (1219 by 2438 Mm). 4. Thickness: a. Base Layer: 4" Maximum B. Upper Layers; as Required to Achieve Final Insulation Thickness; Provide No Fewer Than 3 Layers of Insulation With Staggered Joints. B. Tapered Insulation: Provide Factory-tapered Insulation Boards. 1. Material: Match Roof Insulation 2. Minimum Thickness: 1/4 Inch (6.35 Mm). 3. Slope: a. Roof Field: 1/4 Inch Per Foot (1:48) Unless Otherwise Indicated on Drawings. B. Saddles and Crickets: 1/2 Inch Per Foot (1:24) Unless Otherwise Indicated on Drawings. 2.5 Insulation Accessories a. Fasteners: Factory-coated Steel Fasteners With Metal or Plastic Plates With Corrosion-resistance Provisions Designed for Fastening Roof Insulation and Cover Boards to Substrate, and Acceptable to Roofing System Manufacturer. B. Insulation Adhesive: Insulation Manufacturer's Recommended Adhesive Formulated to Attach Roof Insulation to Substrate or to Another Insulation Layer as Follows: 1. Modified Asphaltic, Asbestos-free, Cold-applied Adhesive. 2. Bead-applied, Low-rise, One-component or Multicomponent Urethane Adhesive. 3. Full-spread, Spray-applied, Low-rise, Two-component Urethane Adhesive. C. Cover Board: Astm C1177/c1177m, Glass-mat, Water-resistant Gypsum Board or Astm C1278/c1278m Fiberreinforced Gypsum Board. 1. Georgia Pacific Building Products: Densdeck 2. Thickness: 5/8 Inch (16 Mm). 3. Surface Finish: Factory Primed 2.6 Walkways a. Flexible Walkways: Factory-formed, Nonporous, Heavy-duty, Slip-resisting, Surface-textured Walkway Rolls, Approximately 3/16 Inch (5 Mm) Thick and Acceptable to Roofing System Manufacturer. 1. Size: 36 Wide Rolls 2. Color: Gray B. Roof Pavers: Heavyweight, Hydraulically Pressed Concrete Units, Square Edged With Top Edges Beveled 3/16 Inch (5 Mm), Factory Cast for Use as Roof Pavers; Absorption Not Greater Than 5 Percent, Astm C140/c140m; No Breakage and Maximum 1 Percent Mass Loss When Tested for Freeze-thaw Resistance, Astm C67; and as Follows: 1. Size: 24 by 24 Inches (600 by 600 Mm). Manufacture Pavers to Dimensional Tolerances of Plus or Minus 1/16 Inch (1.6 Mm) in Length, Height, and Thickness. Part 3 - Execution 3.1 Examination a. Examine Substrates, Areas, and Conditions, With Installer Present, for Compliance With Requirements and Other Conditions Affecting Performance of the Work. The Bidder is Responsible for Field Verifying All Work Areas and Existing Conditions. 3.2 Preparation a. Perform Fastener-pullout Tests According to Roof System Manufacturer's Written Instructions. 1. Submit Test Result Within 24 Hours After Performing Tests. A. Include Manufacturer's Requirements for Any Revision to Previously Submitted Fastener Patterns Required to Achieve Specified Wind Uplift Requirements. Installation of Insulation a. Coordinate Installing Roofing System Components, So Insulation is Not Exposed to Precipitation or Left Exposed at End of Workday. B. Comply With Roofing System and Roof Insulation Manufacturer's Written Instructions for Installing Roof Insulation. C. Installation Over Wood Decking: 1. Mechanically Fasten Slip Sheet to Roof Deck Using Mechanical Fasteners Specifically Designed and Sized for Fastening Slip Sheet to Wood Decks. A. Fasten Slip Sheet to Resist Specified Uplift Pressure at Corners, Perimeter, and Field of Roof. 2. Install Base Layer of Insulation With Joints Staggered Not Less Than 24 Inches (610 Mm) in Adjacent Rows. A. Where Installing Composite and Non-composite Insulation in Two or More Layers, Install Non Composite Board Insulation for Bottom Layer and Intermediate Layers, if Applicable, and Install Composite Board Insulation for Top Layer. B. Trim Insulation Neatly to Fit Around Penetrations and Projections, and to Fit Tight to Intersecting Sloping Roof Decks. C. Make Joints Between Adjacent Insulation Boards Not More Than 1/4 Inch (6 Mm) in Width. D. At Internal Roof Drains, Slope Insulation to Create a Square Drain Sump With Each Side Equal to the Diameter of the Drain Bowl Plus 24 Inches (610 Mm). 1) Trim Insulation So That Water Flow is Unrestricted. Fill Gaps Exceeding 1/4 Inch (6 Mm) With Insulation. F. Cut and Fit Insulation Within 1/4 Inch (6 Mm) of Nailers, Projections, and Penetrations. G. Loosely Lay Base Layer of Insulation Units Over Substrate. 3. Mechanically Attach Base Layer of Insulation Using Mechanical Fasteners Specifically Designed and Sized for Fastening Specified Board-type Roof Insulation to Wood Decks. A. Fasten Insulation to Resist Specified Uplift Pressure at Corners, Perimeter, and Field of Roof. 4. Install Upper Layers of Insulation and Tapered Insulation With Joints of Each Layer Offset Not Less Than 12 Inches (305 Mm) From Previous Layer of Insulation. A. Staggered End Joints Within Each Layer Not Less Than 24 Inches (610 Mm) in Adjacent Rows. B. Install With Long Joints Continuous and With End Joints Staggered Not Less Than 12 Inches (305 Mm) in Adjacent Rows. C. Trim Insulation Neatly to Fit Around Penetrations and Projections, and to Fit Tight to Intersecting Sloping Roof Decks. D. Make Joints Between Adjacent Insulation Boards Not More Than 1/4 Inch (6 Mm) in Width. E. At Internal Roof Drains, Slope Insulation to Create a Square Drain Sump With Each Side Equal to the Diameter of the Drain Bowl Plus 24 Inches (610 Mm). 1) Trim Insulation So That Water Flow is Unrestricted. F. Fill Gaps Exceeding 1/4 Inch (6 Mm) With Insulation. G. Cut and Fit Insulation Within 1/4 Inch (6 Mm) of Nailers, Projections, and Penetrations. H. Loosely Lay Each Layer of Insulation Units Over Substrate. 3.6 Installation of Cover Boards a. Install Cover Boards Over Insulation With Long Joints in Continuous Straight Lines With End Joints Staggered Between Rows. Offset Joints of Insulation Below a Minimum of 6 Inches (150 Mm) in Each Direction. 1. Trim Cover Board Neatly to Fit Around Penetrations and Projections, and to Fit Tight to Intersecting Sloping Roof Decks. 2. At Internal Roof Drains, Conform to Slope of Drain Sump. A. Trim Cover Board So That Water Flow is Unrestricted. 3. Cut and Fit Cover Board Tight to Nailers, Projections, and Penetrations. 4. Loosely Lay Cover Board Over Substrate. B. Install Slip Sheet Over Cover Board and Beneath Roof Membrane. 3.7 Installation of Adhered Roofing a. Adhere Roof Membrane Over Area to Receive Roofing According to Roofing System Manufacturer's Written Instructions. B. Unroll Roof Membrane and Allow to Relax Before Installing. C. Start Installation of Roofing in Presence of Roofing System Manufacturer's Technical Personnel. D. Accurately Align Roof Membrane and Maintain Uniform Side and End Laps of Minimum Dimensions Required by Manufacturer. Stagger End Laps. E. Bonding Adhesive: Apply to Substrate and Underside of Roof Membrane at Rate Required by Manufacturer and Allow to Partially Dry Before Installing Roof Membrane. Do Not Apply to Splice Area of Roof Membrane. In Addition to Adhering, Mechanically Fasten Roof Membrane Securely at Terminations, Penetrations, and Perimeter of Roofing. G. Apply Roof Membrane With Side Laps Shingled With Slope of Roof Deck Where Possible. H. Seams: Clean Seam Areas, Overlap Roof Membrane, and Hot-air Weld Side and End Laps of Roof Membrane and Sheet Flashings, to Ensure a Watertight Seam Installation. 1. Test Lap Edges With Probe to Verify Seam Weld Continuity. Apply Lap Sealant to Seal Cut Edges of Roof Membrane and Sheet Flashings. 2. Verify Field Strength of Seams a Minimum of Twice Daily, and Repair Seam Sample Areas. 3. Repair Tears, Voids, and Lapped Seams in Roof Membrane That Do Not Comply With Requirements. I. Spread Sealant Bed Over Deck-drain Flange at Roof Drains, and Securely Seal Roof Membrane in Place With Clamping Ring. 3.8 Installation of Base Flashing a. Install Sheet Flashings and Preformed Flashing Accessories and Adhere to Substrates According to Roofing System Manufacturer's Written Instructions. B. Apply Bonding Adhesive to Substrate and Underside of Sheet Flashing at Required Rate and Allow to Partially Dry. Do Not Apply to Seam Area of Flashing. C. Flash Penetrations and Field-formed Inside and Outside Corners With Cured or Uncured Sheet Flashing. D. Clean Seam Areas, Overlap, and Firmly Roll Sheet Flashings Into the Adhesive. Hot-air Weld Side and End Laps to Ensure a Watertight Seam Installation. E. Terminate and Seal Top of Sheet Flashings and Mechanically Anchor to Substrate Through Termination Bars. 3.9 Installation of Walkways a. Flexible Walkways: 1. Install Flexible Walkways at the Following Locations: a. Perimeter of Each Rooftop Unit. B. Between Each Rooftop Unit Location, Creating a Continuous Path Connecting Rooftop Unit Locations. C. Between Each Roof Hatch and Each Rooftop Unit Location or Path Connecting Rooftop Unit Locations. D. Top and Bottom of Each Roof Access Ladder. E. Between Each Roof Access Ladder and Each Rooftop Unit Location or Path Connecting Rooftop Unit Locations. F. Under Locations Shown for Roof Pavers G. As Required by Roof Membrane Manufacturer's Warranty Requirements. 2. Provide 6-inch (76-mm) Clearance Between Adjoining Pads. 3. Heat Weld to Substrate or Adhere Walkway Products to Substrate With Compatible Adhesive According to Roofing System Manufacturer's Written Instructions. B. Roof-pavers: Install Roof Pavers According to Manufacturer's Written Instructions. 1. Install Roof Paver Walkways at the Following Locations: a. Locations Indicated on Drawings. 2. Install Paver Butt Tight to Each Other and With Not More Than a 2" Gap at Building Elements.

Division 07 -

Thermal and Moisture Protection, Dampproofing and Waterproofing, Thermal Protection.