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1.45 Any required crickets or drains should be installed at the time the main deck is poured (i.e. monolithic).
1.46 Voids, rock pockets and excessively rough surfaces shall be repaired with Mer-Ko Epoxy grout or ground to match the unrepaired areas.
1.47 When metal decking is used as the concrete form, it shall be of the “ventilating type”.
1.48 All concrete decks poured over pre-cast “T’s”, planks or slabs, shall have control joints placed directly over all corresponding joints or openings in the pre-cast units.
1.5 Job Conditions:
1.51 Before any waterproofing work is started, the waterproofing applicator shall thoroughly examine all surfaces for any deficiencies. Should any deficiencies exist, the architect, owner or general contractor shall be notified in writing and corrections made.
1.52 Do not proceed with application of materials when deck temperature is less than 40°F or if precipitation is imminent.
1.53 Warn personnel against breathing of vapors and contact of material with skin or eyes. In confined areas, workmen shall wear approved respiratory protection gear and protective clothing.
1.54 All gas flames and electrical apparatus shall be shut down prior to the start of and during coating applications.
1.55 Protect plants, vegitation and animals which might be affected by the coating operation.
1.56 Mer-Thane Vehicular Deck Systems should not be installed onto on-grade slabs, split slabs with buried membrane or onto slabs over unvented metal pans without prior approval from Mer-Krete Systems/ Mer-Ko Materials a division of Parexlahabra , Inc.

2. QUALIFICATIONS
2.1 Authorized Applicator:
2.11 Shall be experienced in successfully applying the same or similar materials and shall be specifically approved as an authorized applicator in writing by Mer-Krete Systems/ Mer-Ko Materials a division of Parexlahabra , Inc.
2.12 Shall be financially responsible and be ready and able to submit performance bonds if required.
2.13 Shall submit to Mer-Krete Systems/ Mer-Ko Materials a division of Parexlahabra , Inc. and the building owner the required certificates of insurance prior to starting the project.
2.2 Samples Submittals: Submit samples not less than 4" x 3" in size, showing approximate applied thickness, texture and color. The submittal shall also include this application/specification sheet and a list of materials by name and quantity to be used in this project in order to demonstrate compliance with these specifications.

3. MATERIALS
Materials shall be delivered to the job site in the original sealed containers bearing the product name, color, manufacturer’s lot number, directions for use and precautionary labels. All products listed are supplied by Mer-Krete Systems/ Mer-Ko Materials a division of Parexlahabra , Inc.
3.1 Caulking Compound shall be a one-component or two-component polyurethane compound approved by Mer-Ko.
3.2 Flashing shall be Neoprene sheet at 45-60 mils thickness, non-woven reinforcing fabric, or as recommended by coatings supplier.
3.3 Primer shall be Mer-Thane Primer Epoxy-Polyamide, low viscosity, two-component primer/sealer.
3.4 Base Membrane shall be Mer-Thane Base Coat single-component, VOC compliant, high adhesion, moisture cured, liquid polyurethane membrane and shall meet or exceed the following typical performance properties:
3.5 Elastomeric Membrane shall be Mer-Thane Intermediate Coat single-component, VOC compliant, high tensile strength, liquid applied elastomeric polyurethane and shall meet or exceed the following typical performance properties:
3.6 Traffic-Resistant Top Coat shall be Mer-Thane 600 (or 600-HS) single-component, VOC compliant, high tensile strength, abrasion resistant and weather resistant aliphatic polyurethane membrane and shall meet or exceed the following typical performance properties:
3.7 Aggregate shall be equal to 16 and 20 mesh flint shot silica, ground glass or silicon carbide. Aggregate shall be hard and stable to atmospheric conditions and shall be fresh water washed, dried and sized.

4. SUBSTRATE PREPARATION
4.1 Concrete Surfaces:
4.11 The concrete surface must be thoroughly clean, dry and free from any surface contaminants or cleaning residue. Acceptable methods of cleaning are sandblasting, acid etching, or mechanical grinding followed by the complete and thorough removal of any residue.
4.12 All cracks over 1/16" in width and all moving cracks under 1/16" in width shall be routed out to 1/4" minimum in width and depth and filled flush with polyurethane elastomeric sealant.
4.13 All cracks shall be stripe-coated with 30 mils of Mer-Thane Base Coat for a distance of 2 inches on either side of the crack.
4.14 Apply a 2 inch face coat stripe of Mer-Thane Base Coat around all pipes, drains and vertical junctions.
4.15 All expansion and contraction joints shall be cleaned, primed, fitted with a backing rod and caulked with elastomeric polyurethane sealants. Joints and all caulked cracks shall be stripecoated with a 30 mil preparatory coat of Mer-Thane Base Coat.
4.16 Prior to commencing with the application, all surfaces to be coated shall be dry and free from any surface contaminants or cleaning residues.
4.2 Flashing:
4.21 All required metal, neoprene, and fabric flashings shall be installed at this time.
4.22 All shop-primed metal shall be primed with Mer-Thane Primer prior to coating with the flashing adhesive or base membrane. (For metal or plastic surfaces which may exhibit adhesion difficulties, use a zinc chromate epoxy primer.
4.23 Mer-Thane Base Coat is used as an adhesive and as a coating for the reinforcing fabric flashing. The flashing fabric shall be laid into the wet base membrane with roller, brush or broad blade knife. The fabric shall be laid relaxed, smooth and wrinkle-free.
4.24 The wet imbedded tape shall be over-coated with base membrane extending at least one inch beyond the fabric edge. Allow to cure overnight.
4.25 Flashing shall be coated (with base coats and top coats) each time the deck is coated.

5. APPLICATION OF MEMBRANE
5.1 The waterproofing applicator shall have sole right of access to the specified areas for the time needed to complete the application and affect an adequate cure.
5.2 Primer: Apply Mer-Thane Primer at the approximate rate of 250-300 sq.ft. per gallon. Within 16 hours of the application of the primer, the base coat must be applied. If the base coat cannot be applied within 16 hours, then reprime.
5.3 Mer-Thane Base Coat shall be spray, squeegee or roller applied in one uniform coat at the rate of one gallon minimum per 40 square feet or as needed in order to obtain a minimum thickness of 34 dry mils. Allow the base membrane to cure 16 to 48 hours.
5.4 Mer-Thane Intermediate Coat shall be spray, squeegee or roller applied in one uniform coat at the rate of one gallon minimum per 80 square feet or as needed to obtain a minimum thickness of 16 dry mils. While the coating is still fluid, uniformly broadcast 16 mesh aggregate over the surface at the rate of 12-15 lbs. per 100 square feet and immediately backroll to encapsulate the aggregate. Allow to cure (16-36 hours @ 77°F).
5.5 Heavy Duty Deck System: Apply a second coat of Mer-Thane Intermediate Coat as described above. While the coating is still fluid, uniformly broadcast 20 mesh aggregate over the surface at the rate of 15-25 lbs. per 100 square feet and immediately backroll to encapsulate the aggregate.
5.6 After the Mer-Thane Intermediate Coat has cured, Mer-Thane 600 Top Coat shall be spray or roller applied in one uniform coat at the rate of one gallon minimum per 100 square feet or as needed in order to obtain an average thickness of 10 dry mils and to completely coat the aggregate.
5.7 Total thickness of the Mer-Thane Vehicular Deck System shall average 60 dry mils. Heavy Duty Deck System shall average 85 dry mils.

6. APPLICABLE STANDARDS/SPECIFICATIONS
This Traffic Bearing Coating System complies with applicable VOC regulations including SCAQMD 1113, has passed UL 790/ASTM E-108 Class A fire tests on non-combustible substrates and meets the performance requirements of ASTM C 957-87, High Solids Content, Cold Liquid Applied Elastomeric Waterproofing Membrane with Integral Wearing Surface.

7. MAINTENANCE WARRANTY
When this Elastomeric Coating System is installed, inspected and approved in accordance with these specifications, and after final payment to the applicator and supplier, Mer-Krete Systems/ Mer-Ko Materials a division of Parexlahabra , Inc., the Authorized Applicator shall issue a standard Mer-Thane Maintenance Guarantee covering defects in material and workmanship. This guarantee shall insure waterproofing performance to the owner.
The dollar value of liability to Mer-Krete Systems/ Mer-Ko Materials a division of Parexlahabra , Inc. and buyer’s remedy under this guarantee shall not exceed the purchase price of the materials in question. No guarantee shall be given to cover conditions of failure caused by misuse, mistreatment, faulty design, structural or seismic failure, or other circumstances beyond the control of the supplier and Authorized Applicator. No liability will be express or implied for damages, in any respect, to any building or contents thereof.