|This Master Guide Specification has been established as an up-to-date inspection, preparation, repair and membrane coating system installation procedure for interior and exterior concrete and steel surfaces subject to immersion or non-immersion in aqueous environments and/or abrasion conditions.|
|A. Submit Manufacturer’s literature, certificates and samples in a single package to the Architect, Engineer or Owner in accordance with requirements specified in General Conditions and Division I, General Requirements.
B. Literature on the protective coating, as well as related repair materials, primers, sealers, sealant, reinforcement, etc. shall be submitted for review before work is started. Literature shall include material specification, physical properties (including ASTM and other test methods utilized), Manufacturer’s estimated application rate for required dry mil thickness, current application instructions, warnings or precautions and Material Safety Data Sheets.
C. Applicator’s Qualifications: Submit a copy of Approved Applicator letter and/or certificate as issued and signed by an Officer of the Manufacturer of the 100% solids elastomeric polyurethane coating system.
|A. Qualifications of Contractor
1. The Contractor shall be approved by the Coatings Manufacturer and shall have a minimum of three (3) years experience in the application of 100% solids elastomeric polyurethane coatings.
2. The Contractor shall provide a list of project references similar in nature to the one proposed.
B. Qualifications of Manufacturer
1. Manufacturer of the fluid applied 100% solids elastomeric polyurethane coating system shall have a proven 10-year track record of successful installations utilizing 100% solids elastomeric polyurethane coating technology.
2. Manufacturer shall submit certification, signed by an Officer, that neither coal tar, highly aromatic hydrocarbons, Moca or fillers such as silica flour are used in the manufacture of any component of the elastomeric coating system.
3. Other Manufacturer’s products shall be considered for use only after submittal of product data files supporting full compliance with specifications herein. The Architect, Engineer or Owner reserves the right to reject substitution proposals should it be determined they do not provide all functions required for application.
4. Pre-bid Job Walk and Conference: The Contracting Officer shall conduct a pre-bid job walk and conference to review the drawings and specifications, as well as the procedure for on-site inspection and acceptance of the substrate and the coating system. Pertinent structural details that may require special attention shall be reviewed at this time. Contracting Officer’s requirements and limitations relating to the Contractor’s plan for coordination of the work of the various trades involved with the facility and its personnel shall also be covered.
|Product Delivery, Storage & Handling|
|A. Delivery of Materials: Materials shall be delivered to the jobsite in original, sealed containers with labels legible and intact.
B. Storage of Materials: Materials shall be stored in an area specifically designated for that purpose, where temperatures will not be less than 50 F (10 C) or higher than 100 F (38 C).
C. Material Handling: Materials shall be handled and installed per Manufacturer’s instructions and all applicable health and safety regulatory agencies.
D. Damaged Materials: Contaminated, damaged or unsealed materials, or materials not conforming to the specified requirements shall not be used in the installation and shall be replaced at no additional cost to the Owner.
|A. Install all materials in strict accordance with Manufacturer’s published safety and weather precautions.
B. Do not apply elastomeric polyurethane coating system components when the ambient and/or surface temperature is below 40 F (5 C) or above 110 F (43 C), if any surface moisture is present, or when the dew point is within 5 F (3 C) of the surface temperature. Do not apply if weather conditions will not permit complete cure before rain, dew, fog or freezing temperatures occur. Do not apply if wind velocity exceeds 15 MPH (24 KPH) without taking appropriate precautions.
C. Take all measures necessary to protect unrelated surfaces from coating overspray or spillage.
|Field Quality Control|
|A. The overall weather conditions, including surface temperature, surface moisture, ambient temperature, relative humidity and wind velocity shall be recorded by the Contractor, at designated time intervals, on the Daily Quality Control Report Form if so requested by the Architect, Engineer or Owner.
B. Verification of Protective Coating Thickness: The quantity of primer used, batch numbers and the area in square feet shall be recorded daily, as shall the wet film thickness, quantity, batch numbers and area in square feet applied of the elastomeric coating, on the Daily Quality Control Form.
|A. Biodegradable Cleaner: UNITED CLEANING CONCENTRATE (UCC), water-reducible non-phosphate cleaner as supplied by Coating Manufacturer for use in cleaning concrete and other substrates prior to coating.
B. Concrete Repair Material: UNI-CRETE, polymer concrete renovation and repair material as supplied by Coating Manufacturer for use in filling voids and resurfacing spalled or rough concrete surfaces.
C. Reinforcing Tape: UC-30 JOINT FABRIC, low-profile reinforcement tape as supplied by Coating Manufacturer for use over control joints and moving cracks in concrete surfaces.
D. Concrete Primer and Sealer: UNI-TILE SEALER, two-component polyamide penetrating epoxy as supplied by Coating Manufacturer for use in priming and sealing concrete surfaces.
E. Corrosion-Resistant Metal Primer: PRIMER 302, polyurethane-based, zinc phosphate metal primer as supplied by Coating Manufacturer for use in priming steel surfaces.
F. Fluid Applied Polyurethane Elastomer Topcoat: ELASTUFF 120, 100% solids polyurethane as supplied by Coatings Manufacturer for use on concrete and/or steel surfaces. Refer to printed Technical Data sheet for performance properties.
|Each components shall first be mixed to a uniform consistency. Color of the Part A component shall be Clear. Color of the Part B component shall be White. When properly proportioned and mixed, the resulting color shall be Gray. Any deviation from the standard Gray color shall be recognized as off-ratio material, and shall be removed, cleaned and recoated. Limited custom colors may also be selected as required.|
|A. All surfaces shall be clean and dry, free from any existing coatings, sealers, dirt, grease, oil, pollution fallout, smoke, wax, form release agents, chemical contamination, latence, etc.
B. Portland Cement ASTM Type I concrete shall be allowed to cure for a minimum of 28 days. Portland Cement ASTM Type II shall be allowed to cure for a minimum of 7 days. Shotcrete repairs shall be allowed to cure for a minimum of 28 days.
C. Inspect surfaces to determine condition of expansion joints, and to identify any severe cracks or other conditions requiring special attention. Use urethane caulk, epoxy injection or other appropriate, approved patching material for repairing the concrete surface. Repair any leaks or other structural details as instructed by the Structural Engineer.
D. Actual surface preparation procedures that are to be followed on a specific project will vary depending upon service conditions, condition of the substrate, and the presence of existing paints, coatings or other contaminants. The following surface preparation procedures and recommendations are provided for guideline use only.
A. SCAFFOLDING AND/OR RIGGING: Shall be constructed as required to permit safe, unimpeded access to all surfaces.
B. CHEMICAL CLEANING: Surfaces that are contaminated with oil, grease, dirt, chemicals or other surface contaminants shall be cleaned prior to blasting or acid etching with United Cleaning Concentrate (UCC) or other approved biodegradable chemical cleaner and water, as per ASTM D4258 “Surface Cleaning Concrete for Coating”. Dilute UCC at the rate of 1 part cleaning concentrate to 10 parts water. Apply dilute mixture to the surface under low pressure in accordance with the Manufacturers printed application instructions. Mechanical scrubbing may be necessary to remove tightly adhering contaminants. After allowing the cleaner to sit a minimum of 15 minutes, thoroughly power rinse using fresh, clean water at a minimum of 4.5 gallons (171) per minute with a minimum operating pressure of 2500 psi (17225 kPa), utilizing a 25 or 40 ceramic nozzle.
C. ABRASIVE BLAST CLEANING: All concrete subject to immersion conditions shall be abrasive blast cleaned as per ASTM D4259 “Abrading Concrete”, so as to provide a minimum surface height profile of 5 to 8 mils (127 to 203 microns). Blasting must produce an even profile, free of loose aggregate, weak matrix, crusts, dusting and other contaminants. Existing paints or coatings must be completely removed, except for residual areas that resist thorough blast cleaning.
D. ACID ETCH CLEANING: Concrete subject to non-immersion conditions may be acid-etched as an alternative to blast cleaning, provided that acid etching produces an even profile of 5 to 8 mils (127 to 203 microns). Acid etching shall be accomplished using a 10% Muriatic Acid solution. Following Manufacturers instructions, the diluted solution shall be sprinkled onto the concrete surface. After the solution has stopped bubbling or foaming (normally 5 to 10 minutes), the area shall be scrubbed thoroughly using mechanical scrubbers. After scrubbing, all surfaces shall be thoroughly rinsed with liberal amounts of fresh water to assure complete acid removal. Surfaces may require additional rinsing or a high pressure rinse to remove all traces of the acid solution.
E. SURFACE REPAIR: All concrete surfaces shall be free from sharp projections, ridges and loose aggregate. Apply a “scratch coat” of UNITEDS Uni-Crete or similar polymer concrete to fill any bugholes or voids. Use a trowel to apply the Uni-Crete with adequate pressure to completely fill the honeycomb or air pocket, and to achieve a sound, consistent surface. Allow the polymer concrete repair material to cure for a minimum of 24 hours at 75 F (24 C) prior to priming. Allow additional cure time in cooler temperatures. When Uni-Crete is used to “sack” rough or porous concrete surfaces, it is not necessary to brush-blast the surface prior to application of the primer and subsequent polyurethane topcoat.
ELASTUFF 120 – 100% Solids Fluid Applied Elastomeric Polyurethane Coating System
A seamless, fluid applied 100% polyurethane elastomer membrane system designed for application over concrete and/or steel surfaces. The concrete epoxy coatings system shall be a 1:1 ratio (A:B), fast set, 2-component hydrophobic polyurethane elastomer, containing no silica fillers or extenders. It shall have been tested and approved by an independent testing laboratory and shown to comply with Department of Health Services (DOHS) and Environmental Protection Agency (EPA) Standards for leachates – the Purgeable Priority Pollutant Analysis. The coating shall also have passed approved 3rd party independent testing certifying conformance to ANSI/NSF Standard 61*. Approved system shall be UNITED COATINGS’ ELASTUFF 120 Coating System consisting of UNITED CLEANING CONCENTRATE (UCC), UNI-CRETE, UNI-TILE SEALER, PRIMER 302, UC-30 JOINT FABRIC and ELASTUFF 120 100% solids polyurethane elastomer.
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