Duro-Last Roofing, Inc.
525 Morley Drive.
Saginaw, MI 48601
Tel: (800) 248-0280
Fax: (800) 432-9331
http://www.duro-last.com

Product Description

The Duro-Last membrane is classified as a PVC (polyvinyl chloride) and is a proprietary thermoplastic formulation consisting of resins, plasticizers, stabilizers, biocides, flame retardants and U. V. absorbents. The membrane is laminated to a weft insertion knitted scrim.

Duro-Last meets or exceeds all major fire and wind code requirements, and has obtained regional approvals as necessary throughout the country. Duro-Last has been approved by Factory Mutual as a 1-60, 1-90, 1-105, 1-150 and 1-210 roofing system and has passed wind uplift tests up to 210 psf. Duro-Last is also listed by Underwriters Laboratory as a UL Class A material. The code agencies BOCA, ICBO and SBCCI have approved the Duro-Last Membrane for use in their jurisdictions.

Duro-Last prides itself on being a "charter partner" of the Energy Star® Roof Products Program. Utilizing the Energy Star label illustrates to building owners and managers that the Duro-Last's Cool Zone Roofing System can save them money in energy costs because of the high reflectivity of its white membrane.

The Duro-Last membrane is available in white, tan or gray.



Duro-Last®

THE “WORLD’S BEST ROOF”®

Duro-Last Roofing, Inc., is the pioneer and one of the nation’s largest manufacturers of custom prefabricated roofing systems. The Duro-Last Roofing System is prefabricated in the Duro-Last manufacturing plants to meet your specific roofing needs. Approximately 80% of the field seams and roughly 95% of the remaining critical areas (projections and perimeters) are dielectrically welded under ideal factory conditions. The result is a consistent, high quality roofing system designed and manufactured for each building on which it’s installed; a concept which renders other roofing systems obsolete. Our standard 40 mil membrane outperforms other roofing products in all critical areas.

Duro-Last Roofing, Inc., warranties are available at no additional cost and we believe are the best in the industry. Commercial projects may be eligible for (at the choice of the building owner) either a 15-year or 20-year warranty. Residential projects receive a separate 15-year warranty. The warranty section in this manual covers each warranty in detail. When the commercial roof is completed, a Duro-Last quality assurance specialist will inspect the roof for compliance with the Duro-Last specification. Upon final inspection, acceptance, and payment of all related invoices, a Duro-Last quality assurance specialist will immediately issue the warranty to the Duro-Last contractor.

The Duro-Last Roofing System meets or exceeds major national fire and wind code requirements as well as most of the regional approvals throughout the country. Duro-Last is approved by Factory Mutual Research Corporation (FMRC), Underwriters Laboratories, Inc. (UL), and the major code agencies; Building Officials & Code Administrators (BOCA), International Conference of Building Officials (ICBO), and Southern Building Code Conference International, Inc. (SBCCI).

Duro-Last participates in the major technical committees in the roofing industry including the American Society of Testing Materials (ASTM), and the Single Ply Roofing Institute (SPRI). In addition, Duro-Last maintains and continually updates a highly sophisticated in-house laboratory for quality control testing for all phases of manufacturing.

Duro-Last and its subsidiary companies employ over 725 people, including 50 who are factory trained quality assurance specialists strategically located throughout the country. In addition, Duro-Last has a network of over 60 sales professionals based throughout the United States, and Canada.

As Duro-Last has grown into its position of distinction, several major industrial leaders, corporations and sources of specifications throughout the country have recognized Duro-Last for its technological contributions to the roofing industry. Duro-Last won the “State of Michigan New Product of the Year” award in 1986. Governor Blanchard presented Duro-Last’s Founder John R. Burt, with the “Small Businessman-Of-The-Year” award in 1987. In 1991, Burt was honored with the “Entrepreneur of the Year” award for the St ate of Michigan, and in 1997-1998, he was a finalist for this same award. Also in 1998, Burt received the “Vision of Free Enterprise” award followed by a special award in 1999, recognizing his outstanding contributions to the economy of Saginaw County. Nationally recognized roofing experts have visited the Duro-Last facility, and have stated that its quality control procedures are the best in the roofing industry.

Duro-Last’s increasing penetration into commercial and institutional sectors has generated “controlled” growth at more than twice the rate of the roofing industry. As a result, Duro-Last has made major capital improvements and investments towards increased manufacturing capacity, allowing for growth and vertical integration of manufacturing as well as improved quality control of the entire Duro-Last Roofing System.

All of this translates into a roofing system that provides the consistent watertight integrity building owners look for. By manufacturing virtually all of the components of the roofing system in its facilities, using rigorous quality-controlled procedures, and by providing the majority of the labor for “building” the roof system in its factory, Duro-Last minimizes the liabilities commonly associated with a roofing investment. Furthermore, Duro-Last backs its claims by offering the most comprehensive warranty coverage in the industry. In short, Duro-Last Roofing, Inc. is committed to its business. Duro-Last has earned the respect of the roofing and business communities throughout the United States and has assumed a leading role in roofing manufacturing technology. Duro-Last looks forward to providing the best solution to your roofing needs.

FORWARD

The main purpose of this manual is to create a better understanding of specifications and conditions for the installation of the Duro-Last® Roofing System. There are literally hundreds, if not thousands, of different installation details, and not all can be covered. However, with a basic understanding you will be able to accommodate almost any situation. Should you have any questions, do not hesitate to call Duro-Last at 800-248-0280.

This manual does not attempt to make judgments on whether or not an existing roof system should be removed. Nor does this manual make structural judgments for weight considerations.

Use this manual as a guide for installing the Duro-Last Roofing System. It will prove itself invaluable in achieving an installation that will provide top-notch performance, security, and longevity for the building owner.

Notes:

1. The Duro-Last contractor is responsible for following all applicable building, plumbing and electrical codes.
2.
  		 The Duro-Last contractor is responsible for taking core cuts and conducting pullout tests. These tests will be used to determine fastener type and length as well as to determine the condition of the existing roof deck and presence of water in the existing roof system.
3. Duro-Last does not support the practice of roofing over existing roof systems that contain excess moisture. This includes water that flows into openings created by core cuts or water that is obtained by squeezing the core sample taken from the existing roof system. Any decision to recover a roof with excessive moisture is the sole responsibility of the building owner, and may affect or limit warranty coverage.
4. The Duro-Last contractor is responsible for standard roofing practices, proper safety procedures, and compliance with OSHA, as well as all state, local and other safety rules, regulations, and codes. It is the responsibility of the roofing contractor to obtain any project building permits and insurance necessary that are above and beyond those Duro-Last may require.
5. The Duro-Last contractor assumes the responsibility to assure that the installed system meets or exceeds all project specifications. The Duro-Last Roofing System is Underwriters Laboratory classified and Factory Mutual Research approved. For these and other special conditions, consult the DURO-LAST ENGINEERING SERVICES DEPARTMENT at 800-248-0280.
6. Duro-Last Roofing, Inc. is not responsible for any alterations to a roofing system (new or existing) which may change the thermal characteristics or dew point of the roofing assembly.
7. The sole purpose of the Duro-Last warranty inspection process is to determine the proper application of the Duro-Last Roofing System. This inspection in no way extends to adjacent building components or other areas the Duro-Last inspector may come in contact with, including but not limited to, structural defects, architectural design or modifications made to the building by the installing contractor. The Duro-Last inspector does not promote himself as knowledgeable about roofing or construction practices other than the proper application of the Duro-Last Roofing System. The ultimate goal of the inspection process is to determine general compliance with these specifications and the overall watertight integrity of the roof system.

GETTING STARTED

MEMBRANE DESCRIPTION

1.
  		 The membrane is comprised of a polyvinyl chloride polymer blend which is reinforced with a high strength, 18 x 14 threads per inch pattern, weft inserted polyester scrim. The membrane contains a combination of UV stabilizers, UV absorbers, plasticizers, heat stabilizers, flame retardant, lubricants and biocides, and shall exhibit the minimum physical properties as listed on the Physical Properties Data in the General Section.
2.
  		 The .040-inch (1 mm) thick Duro-Last single-ply roof membrane has a roll goods weight of approximately 0.25 lb/ft2 (1.3 Kg/m2). The prefabricated roof cover is supplied folded or rolled, in sections up to 2,500 square feet (232 square meters) in area, and having no single linear dimension exceeding 100 feet (30.5 m).

APPLICABILITY

The Duro-Last Roofing System consists of the Duro-Last membrane, fasteners, prefabricated corners, parapets, stacks, curb flashings, vents, and other related Duro-Last-approved products necessary for the proper and warrantable installation of the Duro-Last Roofing System. All materials used in the installation of the Duro-Last Roofing System must be products of Duro-Last Roofing, Inc., or accepted products as defined and described in the specifications. Alternate materials must be accepted in writing by the Duro-Last Engineering Services Department prior to their use with the Duro-Last Roofing System.

TOOL REQUIREMENTS

The authorized Duro-Last contractor should have the following tools which are necessary for the efficient and proper installation of the Duro-Last Roofing System.

  1. Hand welders (hot air) with a spare heating element (Optional: Automatic welder)
  2. Silicone hand roller
  3. Variable speed power screw driver with reverse
  4. P-3 screwdriver tips for screws
  5. Hammer drill with depth gauge
  6. Measuring tapes (100’ and 25’) (30 m and 7.5 m) chalk line, markers, lumber crayon,
  7. Metal snips, hacksaw, keyhole saw, hammers, scissors, utility knives with retractable blades
  8. Vise clamps, nail aprons, caulk gun, screw drivers
  9. Cleaning fluid and rags
  10. 2” (50 mm) flat chisels, pry bar
  11. Ladders
  12. Tack claw
  13. GriPull
  14. Tarps
  15. Pull tester
  16. Special tools necessary for tightening stainless steel band clamps
  17. Extension cords - cord length of 100’ (30 m), #12/3 wire w/ground
  18. Core cutter
  19. Ground fault interrupter
  20. Equipment necessary to raise materials to the rooftop

DRAINAGE/SLOPE

Duro-Last Roofing, Inc. will warrant its membrane in ponding water situations. Duro-Last has found no adverse effects on its membrane because of a lack of positive drainage in a structure. Although Duro-Last does not require positive drainage, good roofing practices incorporate the use of positive drainage for the safety of the structure.

WEATHER CONSIDERATIONS

The Duro-Last membrane is designed to perform in all types of weather. The Duro-Last membrane is regularly subjected to DSET EMMAQUA Exposure (ASTM E-838) and low temperature cracking (ASTM D-2136). (See Physical Properties Data in the General Section.) Installation of the Duro-Last membrane is limited only to the exposure limitations of the installers. It is Duro-Last’s recommendation that installation be performed within the temperature range of –15°F (–26°C) to 115°F (46°C).

DELIVERY

A complete Duro-Last Roofing System and related materials can be delivered in the original packaging and with shipping labels intact. Containers will be labeled with manufacturer’s/supplier’s name, product name and identification. Each shipment should be checked for damages and/or shortages. The freight agent must note damaged materials and/or shortages on the freight bill. Concealed damage must be reported to the freight agent immediately. Materials damaged in shipping, handling or storage cannot be used.

HANDLING

Once the Duro-Last Roofing System is delivered to the job site, the contractor and contractor’s crew are responsible for all handling and installation of the roofing system. Adequate personnel and equipment should be available to safely lift and place the Duro-Last Roofing System onto the rooftop. Folded or rolled prefabricated sections of membrane must be placed on the roof near load-bearing members and in a manner convenient to final placement.

STORAGE

Duro-Last materials should never be stored in ponding water or where the water runs off higher elevations and onto the materials.

THINGS TO KNOW

SUBSTRATE SEPARATION

The Duro-Last membrane is defect-free when it leaves the factory. Certain substrates are not compatible with the Duro-Last membrane and may cause premature failure of the membrane. Over the substrates listed below, install a minimum 3-mil polyethylene or polypropylene slipsheet prior to the installation of the Duro-Last membrane.

Acrylic Coatings Extruded Polystyrene Modified Bitumen Shingles
Aluminum Coated Asphalt Granulated Cap Sheet Old Duro-Last Roofs Smooth Asphalt
Coated Smooth Asphalt Hypalon (CSPE) Polyurethane Sprayed Urethane Foam
Expanded Polystyrene Mineral Surfaced Cap Coal Tar Pitch PVC/CPA Membranes
       
The Duro-Last membrane is compatible with the following substrates and no separation is required.
       
CPE Roofing Glass Fiber Board Gypsum and Dens Deck  
Cellular Glass Boards Prestressed Concrete Decks Polyiso Boards  
EPDM Lightweight\Structural Concrete Decks (Smooth) Wood Decks  
       
CHEMICAL RESISTANCE    

Duro-Last is resistant to the chemicals listed below. If any other chemicals are present on a particular roof, please contact the Engineering Services Department at Duro-Last Roofing, Inc. at 800-248-0280.

Acrylic Paint Linseed Oil Copper Sulfate Lard
Detergent Solution Masonry Cleaner Ferric Chloride Phosphoric Acid
Fertilizer Solution Muriatic Acid Fiberglass Mat Polypropylene
Fruit Juice Oleic Acid Furnace Residue Zinc Chloride
Hydrogen Peroxide Sodium Hydroxide Latex Paint  
       
NOTES      

The Duro-Last membrane may be painted with an approved paint. See Chemical Resistance for approved paint types. In the event that warranty work needs to be performed, the building owner is responsible for the removal and cleaning of the painted areas and the repainting of the modified area, if required. Should you have any questions, please contact the Duro-Last Warranty Department at 800-248-0280.