GacoFlex Acrylic Latex Coating System for Mechanical Room Floors

PART 1 - GENERAL

1.1 SUMMARY

1. This specification covers the construction of a durable and waterproof surface suitable for mechanical room floors. Primary use is waterproofing floors over occupied space. It can be applied with non-skid texture if desired. Once coating has dried, it has excellent resistance to hot and cold water and is very resistant to soiling or staining. GacoFlex latex coatings do not have a strong odor and the wet coatings will not burn. Equipment can be easily cleaned with water and detergent.

1.2 RELATED SECTIONS

1. Cast-In-Place Concrete: Section 03300
2. Flashing and Sheet Metal: Section 07600
3. Drains, Vents, and Penetrations: Section 07700

1.3 SUBMITTALS

1. Product Data: Submit manufacturer's standard submittal package including specification, installation instructions, and general information for each waterproofing material.
2. Applicator Qualifications: Submit current "Qualified Applicator" certificate from specified waterproofing manufacturer.

1.4 QUALIFICATIONS

1. Primary waterproofing materials shall be products of a single manufacturer. Secondary materials shall be recommended by primary manufacturer. Manufacturer shall have a minimum of 10 years experience in manufacture of materials of this type.
2. Applicators shall have a minimum of 5 years experience in application of waterproofing materials of type specified. Applicator shall possess current "Qualified Applicator" certificate from the specified waterproofing manufacturer.
3. Pre-Bid Job Walk: Ten working days prior to bid opening there is to be a mandatory Pre-Bid Conference. Anyone not attending the Pre-Bid Conference will not be allowed to bid the project. All products considered to be an equal to the specified product or any changes in the scope of work installation or specifications must be presented at the Pre-Bid Conference. If a change in the specifications is accepted, it will be considered as an alternate and will be presented as a bid amendment issued 5 working days prior to the bid opening. No other changes to specification or bid documents will be accepted.
4. Pre-Installation Conference: Just prior to commencement of the fluid application waterproofing system, meet at the site with a representative of the coating manufacturer, the waterproofing contractor, the general contractor, the architect and other parties affected by this section. Review methods and procedures, substrate conditions, scheduling and safety.

1.5 DELIVERY, STORAGE AND HANDLING

1. Store all coating materials in the original unopened containers at 60°-80° F (16°-26°C) until ready for use.
2. Safety: Refer to all applicable data, including, but not limited to MSDS sheets, PDS sheets, Product labels, specific instructions for specific personal protection requirements.
3. Ventilation: General room ventilation is satisfactory.
4. Environmental requirements: Proceed with work of this section only when existing and forecasted weather conditions will permit the application to be performed in accordance with the manufacturer's recommendations.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

1. Acceptable Manufacturers:
   • Gaco Western, Inc.

2.2 MATERIALS

1. Acrylic Latex Coating: GacoFlex A-38 Series coatings.
2. Granule: GacoShell Granule, a hard (90 Rockwell Scale), non-crushable, non-extractable organic granule with a specific gravity of 1.3. Size 40 on 60 (.42 mm on .25 mm) unless otherwise specified.
3. Primer/Sealer: GacoFlex two component Epoxy Concrete Sealer E-5320.
4. Other Materials Required: Thinner and cleaner, reinforcing materials, caulking and flashing compounds shall be supplied by Gaco Western, Inc.

PART 3 - EXECUTION

3.1 EXAMINATION

1. Verify that substrate is ready to receive work, surface is clean, dry and free of substances which could affect bond.
2. Do not begin work until concrete substrate has cured 28 days, minimum.
3. Verify that the concrete meets the requirements of the coating manufacturer. Refer to General Instruction GW-2-2 for complete information on the installation and finishing of concrete.
4. Verify that all other work involved with this area, done under other sections, has been completed and accepted by the architect and general contractor prior to starting the waterproofing application.

3.2 PREPARATION

1. Clean substrate to remove any and all surface contaminants. Refer to General Instructions GW-1-1.
2. Mask off all adjoining areas that are not to receive the fluid applied waterproofing.
3. Provide a suitable work station to mix the coating materials.

3.3 INSTALLATION

1. Primer/Sealer: Apply one coat of GacoFlex E-5320 by roller at the rate of ½ gallon per 100 square feet (2 L/10 m2). Allow to dry a minimum of 24 hours. For maximum solvent resistance, see drying time directed in General Instructions GW-2-2.
2. Taping: Apply A-38 acrylic latex by brush in a five to six inch wide strip coat centered over all joints, penetrations and changes of plane to be taped. While this coat is still wet, unroll 66B fabric tape into the coating and apply a coat of A-38 over the tape, smoothing out wrinkles and fishmouths. On plywood substrate taping application will require approximately 1/3 to ½ gallon per 100 sq. ft. (1.3 to 2 L/10 m2).
3. First Base Coat: Apply A-38 acrylic latex by roller in an overall coat to secure a total minimum coverage of ¾ gallon per 100 square feet (3.1 L/10 m2), (Total wet film thickness - 12 mils (.3 mm)).
4. Second Base Coat: Apply A-38 by roller to secure a total minimum coverage of ¾ gallon per 100 square feet. (Total wet film thickness -12 mils.)
5. Top Coats and Texture: Apply two texture top coats consisting of ¾ gallon (3.1 L/10 m2) of A-38 acrylic latex and ¾ pounds GacoShell granule per 100 square feet (37 gm/10 m2) for each coat. Thoroughly blend the granules into the coating before applying.
   Allow the first coat to dry before a second coat can be applied, minimum 6 hours but no more than 72 hours. If left longer than 72 hours, deck must be cleaned with liquid detergent, rinsed thoroughly and allowed to dry completely before proceeding.
   Best results are achieved by applying texture coats in parallel overlapping roller passes, i.e., North-South or East-West. This will result in a pleasing uniform texture which is easy to clean. Allow 48 hours before floor is put into use.

3.4 FIELD QUALITY CONTROL

1. Thickness: The finished dry film thickness will average 21 mils (.5 mm) of acrylic rubber elastomer and will have an approximate total thickness with GacoShell granule of 30 mils (.8 mm).