SINGLE PLY RESTORATION - URETHANE

MASTER GUIDE SPECIFICATIONS

SCOPE: To install a roofing system to waterproof and restore existing single-ply membranes to watertight and maintainable conditions.

RELATED WORK: The work includes but is not necessarily limited to the following:

1. Cleaning and preparation of substrate

2. Application of primers

3. Detailing of flashings and penetrations

4. Application of base coat, or base coat and liner

5. Application of top coat, finish coat on roof surface

SUBMITTALS

PRODUCT DATA: Submit schedules, charts, literature, material safety data sheets, and illustrations to indicate the performance, fabrication procedures, product variations, and accessories.

SAMPLES: Submit sample of cured membrane materials including reinforcing where appropriate.

QUALITY CONTROL: Provide test results from the manufacturer indicating compliance with the specified criteri

MAINTENANCE INSTRUCTIONS: Provide preprinted maintenance instructions for the roof coating system.

WARRANTIES: Provide a sample of Manufacturers warranty and the applicator’s warranty.

QUALITY ASSURANCE

QUALIFICATIONS: Provide factory-trained and authorized installers with a minimum of three-years experience installing work similar to the specified work. Submit written evidence of authorization from the manufacturer that the contractor is an approved applicator.

RESPONSIBILITY FOR PERFORMANCE: If the requirements of the Construction Documents negate or restrict the specified performance, or if a conflict or ambiguity exists in the Construction Documents, the contractor will request a clarification of any discrepancies before proceeding with the work.

PRE-INSTALLATION CONFERENCE: Before starting the work specified herein, a Pre-Installation Conference will be held to discuss all aspects of the project. The following parties will be in attendance:

1. Applicator’s field representative or roofing foreman

2. Manufacturer’s technical representative and affected adjacent trades

3. Owner’s representative

4. Architect

MANUFACTURER’S TECHNICAL ASSISTANCE: Provide a representative to attend the Pre-Installation Conference, and review existing conditions and application procedures at project start-up and periodically during the progression of the project.

CODE REQUIREMENTS

CODE: All work including disposal of materials will be in compliance with applicable local building codes.

DELIVERY AND STORAGE

DELIVERY: Deliver clearly labeled, undamaged materials in the manufacturer’s unopened containers.

TIMING AND COORDINATION: Deliver materials to allow for minimum storage time at the project site. Coordinate delivery with the scheduled time of installation.

STORAGE: Store materials in a clean dry location, protected from weather and abuse.

SITE CONDITIONS

EXAMINATION OF EXISTING CONDITIONS: Contractor will examine existing conditions affecting this work and will report all unsatisfactory conditions to the proper authority and will not proceed until these conditions have been corrected. Commencing work implies acceptance of existing conditions as satisfactory to the outcome of this work.

WARRANTY

TERM: The manufacturer will warrant the specified work from the date of completion for the length of the specified warranty against becoming unserviceable from either nonconforming materials or workmanship.

DEFECT: Defects will include, but not be limited to, the following:

1. Peeling, cracking, blistering, alligatoring, or releasing from the substrata

2. Excessive chalking or dusting

3. Leakage of water into the building or within the construction

PART 2 - PRODUCTS

All products used in the coating assembly will be furnished, specified, or approved of in writing by the Manufacturer and not supplied by the Manufacturer will not be covered by Manufacturerswarranty.

2.01 COATING MATERIALS

BASE COAT: The base coat will be a manufacturer's approved product.:

TOP COAT: The top and/or finish coats will be a manufacturer's approved product

ACCESSORIES

Butyl based all-purpose primer, excellent in priming of plastics,

stainless steel, and hard-to-adhere-to surfaces

Epoxy primer used over concrete and plywood substrates to minimize out-gassing

Bonding primer used for priming of base coat of two component urethanes when the re-coat window has been exceeded and general adhesion to any substrate

Acrylic base coat and all-purpose sealer

Flashing grade stitch-bonded polyester used for reinforcing, flashings, penetrations, seams, cracks, repairing blisters, lining field areas of the roof, etc.

Flat finish polyester for seam lining

Powder additive for making urethane mastic mixture

Rust-locking primer for use in general metal preparation

Ceramic additive

Used to prime EPDM

WALKWAYS

TRAFFIC: In high traffic areas and around mechanical equipment, walkways will be installed to protect the coating system from damage. Install an additional layer of urethane on traffic pattern with sand aggregate.

EXECUTION

CAUTIONS

SOLVENTS: Urethane coatings typically contain organic solvents and as such can be toxic and flammable. Work only in fully ventilated areas. No smoking is allowed when using these products or use near sparks, heat, or any open flames. Read and follow the Material Safety Data Sheets (MSDS).

APPLICATOR: we will follow all safety regulations as required by OSHA and any other local regulations.

WASTE: All waste materials including empty pails will be removed from the site by the applicator and taken to a legal dump authorized to receive such materials.

HAZARD: Applicator will stop work at once if any concealed or unusual condition is discovered and will notify both Manufacturer and the owner of these conditions.

SUBSTRATE PREPARATION

CLEANING: Remove dirt, and foreign material detrimental to adhesion or application of roofing. In most cases use a power washer. If the existing substrate is leaking or badly deteriorated power washing may not be viable. Clean dirt and contaminants by brush; broom by hand. If there are algae growing on the surface, the cleaning will include bleach in the washing of the substrate.

DEFECTS: Examine existing system for defects such as loose or backed out fasteners, wet substrate materials, open seams and repair as needed.

SEAMS: All seams of single ply substrates will be probed with a blunt tipped instrument.

COMPATIBILITY: If there are questions regarding the adhesion or compatibility, contact the Manufacturers Tech Dept for recommendations. If the existing single-ply has an existing coating, a sample test area will be installed and tested for proper adhesion.

DRY: All surfaces to receive coating will be completely dry.

PRIMING (if needed)

RATE: Certain substrates may require the use of a primer to achieve proper adherence of the base coat to the substrate.

The primers will be installed per the instructions on the Product Data Sheets and will be allowed to dry and then coated with the base coat in the proper time period.

LINING OF SEAMS (if needed)

METHOD: Certain substrates like EPDM and PIB membranes require all field-fabricated seams to be reinforced with the polyester liner material. On other single-ply substrates all defective seams as determined by seam probing will require lining.

INSTALLATION:

1. Once the substrate has been cleaned and primed (if needed), apply a base coat of material over the seam area several inches wider than the polyester liner.

2. Roll the 6"-wide polyester liner into the wet substrate and brush it into the coating. Feather out the outside edges of the coating.

3. Install an additional layer of coating over the installed polyester liner at an application rate of 1.5-2.0 gal./sq. (24-32 wet mils thickness). Allow the repaired seams to cure prior to the application of the base coat for the field of the roof.

REPAIR OF SPLITS, CUTS, & FISH MOUTHS

SPLITS & CUTS: All splits will be repaired with the polyester liner.

FISH MOUTHS: All fish mouths in the seam areas will be cut out to provide a smooth substrate and repaired with the polyester liner.

FLASHINGS – POLYESTER REINFORCED (FULLY LINED SYSTEMS)

LINER: The juncture of base flashings at walls, parapets, curbs, flues, vents, penetrations and at gravel stops, drip edges, and gutter edges will be reinforced with polyester liner and base coat.

EXTENSION: For vertical surfaces the polyester fabric reinforcement will extend a minimum of 6" above the roof height and a minimum of 3" onto the field.

FABRIC: For gravel stop, drip edge, and gutter details a minimum of 6"-wide polyester fabric reinforcement.

FLASHINGS - MASTIC DETAILS (UNREINFORCED SYSTEMS)

PROJECTIONS: Round projections, machine legs, sign posts, guide wire straps, inside and outside corners, etcan be flashed using the MF20/20 powder additive mixed into the urethane to create a mastic mixture. The mastic mixture is also used to create cants and as a joint filler.

FIELD LINER (if needed)

REQUIREMENTS: A field liner is typically installed in areas of ponding water and areas of the substrate that are badly deteriorated. Certain substrates such as non-reinforced PVC, W.R. Grace, GRM membranes, and CPA membranes will require lining of the entire roof. Consult the Warranty/Applications guide for specific requirement or contact the Manufacturer's Technical Service Department.

BASE: Setting of the field liner with urethane coating will typically require about 2.0-2.5 gal./sq. of base coat.

APPLICATION OF BASE COAT (unlined systems)

APPLY: Once all required substrate preparation, flashing and penetration details are complete install the base coating over the entire substrate .

METHOD: The coating is installed with notched squeegees and is then back-rolled to assure even coverage.

APPLICATION OF TOP FINISH COATS

FINISH: Once the base coat has cured, immediately proceed with the installation of the top, finish coats.

METHOD: Install the top/finish coat(s) using notched squeegees and back-rolling to insure even application.

CLEANUP

SOLVENT: Clean tools immediately after completion of work. Wear approved solvent-resistance gloves when cleaning the tools.

DISPOSAL: Remove debris, containers, and trash generated by the work on a daily basis. All emptycontainers will be disposed of in accordance with local regulations.