>Catalog Pages (PDF Format)

1.4 Condition of Concrete Surfaces:
1.41 Concrete surfaces shall be of sound structural grade (minimum 3000 PSI compressive strength for structural concrete), and shall have a steel troweled followed by a fine broom finish, free of fins, ridges, voids or air entrained holes.
1.42 Concrete shall be cured by water curing method. Curing compounds or chemical curing agents of any type shall not be used unless they will completely dissipate within 28 days.
1.43 Concrete shall be cured at least 28 days and shall be sloped for proper drainage.
1.44 Saw-cut control joints and/or expansion joints shall have been properly installed over all structural supports or as recommended by the coating manufacturer.
1.45 Any required drains, ducts, or other penetrations should be installed at the time the main deck is poured. All exposed metal pans or surfaces should be of the “ventilating type” and be made clean and clear of any foreign material.
1.46 Voids, rock pockets and excessively rough surfaces shall be repaired with Mer-Ko Epoxy grout or ground to match the un-repaired areas.
1.47 All vertical masonry, block or brick surfaces shall have been grouted smooth and allowed to cure prior to applying any membrane coating. An alternate to concrete grouting is to surface the walls with epoxy block filler.
1.48 All surfaces must be free of visible moisture, grease, dirt and corrosion. Remove all fresh asphalt, resin-based curing compounds, loose scale and any other foreign deposits.
1.49 The prime contractor shall coordinate the work of the plumbing contractor, the concrete contractor and other trades to ensure the proper installation of the drain bases and any other plumbing work during the placement of the concrete and to ensure that the integrity of the installed membrane is maintained.
1.5 Inspection and Test Requirements
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 The waterproofing contractor shall have the sole right of access to the specified areas for the time needed to complete the multi-layered applications and effect an adequate cure. All traffic shall remain off the membrane until a “water test” has been completed and until the protection board has been properly installed, and until the prime contractor has accepted and approved the completed waterproofing installation.

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 dry film sample in the approximate thickness to be installed along with a sample of the proposed protection board.

3. MATERIALS
Materials shall be delivered to the job site in the original sealed containers bearing the product name, 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 Mer-Ko PUC 1000 single component polyurethane compound.
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 Membrane shall be Mer-Thane 320 single-component, VOC compliant, high adhesion, moisture cured, modified polyurethane membrane and shall meet or exceed the following typical performance properties:
3.5 Specifications and Standards: Mer-Thane 320 meets or exceeds performance requirements of ASTM Specification C 836-76.

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 320 Membrane for a distance of 3 inches on either side of the crack. Moving cracks in the structural slab which are 1/16" wide or greater should be routed to form a joint and treated and caulked as an expansion or contraction joint.
4.14 Mask and protect all adjacent areas not to be coated.
4.15 Whenever coating over structural concrete containing lightweight aggregate, the entire substrate must be sealed with Mer-Thane Primer prior to applying the membrane.
4.16 Apply a 1 inch cant face strip of Mer-Thane 320 around all pipes, drains and vertical junctions.
4.17 Any expansion and contraction joints should be cleaned, primed, fitted with a backing rod and caulked with a polyurethane sealant. Joints shall be stripe-coated with a 30 dry mil preparatory coat of Mer-Thane 320 and may need to be reinforced with uncured neoprene rubber sheet.

5. APPLICATION OF MEMBRANE
5.1 Prime all surfaces with Mer-Thane Primer applied at the rate of 250-300 sq. ft. per gallon.
5.2 After all the primer and preparatory work has been completed, the Mer-Thane 320 membrane should be applied as detailed below.
5.3 For Horizontal Surfaces:
5.31 Mer-Thane 320-H Membrane shall be spray, squeegee or roller applied at the rate of 4.5 gallons of material per 100 sq. ft. of surface to produce 60 dry mils of membrane. Allow a minimum of 16 hours of cure time between each coat. Two coats of 30 dry mils each is recommended. If the first coat should become dirty or contaminated, wipe clean with xylene immediately prior to applying the second coat.
5.32 Control application rate by means of pre-measured surface areas.
5.4 For Vertical Surfaces:
5.41 Mer-Thane 330-V Membrane shall be trowel or roller applied at the rate of 4.5 gallons of material per 100 sq. ft. of surface to produce 60 dry mils of membrane. Allow a minimum of 16 hours of cure time between each coat. Two coats of 30 dry mils each is recommended. If the first coat should become dirty or contaminated, wipe clean with xylene immediately prior to applying the second coat.
5.42 Carefully control application of the High Build coating to avoid runs and sags.

6. FIELD QUALITY CONTROL
6.1 As the application progresses and before the Mer-Thane 320 has attained its final set, verify the applied thickness by use of mil-thickness gauge. To those areas which are deficient, immediately apply additional membrane to produce the required thickness.
6.2 Verify the integrity of the cured membrane on horizontal surfaces by damming the entire area and flooding with water to a minimum depth of 2 inches. Allow the water to set 24 to 48 hours and make visual inspections. If repairs are necessary, drain and dry, and then reapply membrane to areas where leakage is detected.
6.3 Prior to installation of the protection coarse, visually inspect all other areas which cannot be water tested for voids, damage or rupture. Repair as required.

7. MEMBRANE PROTECTION
As soon as possible after completion of a successful water test or visual inspection and/or repairs, cover membrane with protection board as indicated on the project drawings. All horizontal and vertical membrane must be protected.

8. PRECAUTIONS
Persons having skin sensitive to urethane and bitumen compounds should wear protective gloves and respiratory masks while applying. Mix and apply these coatings in well ventilated areas while observing normal safety precautions. Store Mer-Thane 320 and Mer-Thane Primer in tightly sealed containers in cool, dry areas until ready to use.

9. 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.