SPECIFICATION
CONDITIONS
General and Special Conditions shall govern this work.

SCOPE OF WORK
This work includes all material, labor, equipment, supervision necessary for, and incidental to, executing and completing installation of Mer-Krete B.F.P. Membrane as manufactured by Mer-Krete Products, Inc. This material shall be installed in strict accordance with the manufacturer’s printed instructions and only by one of their pre-qualified contractors.

MATERIALS
Mer-Krete B.F.P. Membrane shall be composed of a flexible, polyester reinforced waterproof membrane with integral base flashing and synthetic rubber latex mastic.
Acceptable physical qualities for this latex mastic membrane system are as follows:
1. Rubber emulsions for this elastomeric membrane shall be compounded with rubber latex and shall have a minimum total solids content of 28% when tested by the dry cup method.
2. The dehydrating powders shall contain cements of the calcium aluminate variety only, capable of developing 3500 psi in 24 hours (ASTM C-109).
3. The tensile strength shall be a minimum of 450 psi.
4. The membrane shall elongate a minimum of 500%.
5. The membrane shall withstand a waterhead of 115 ft. for a period of sixty minutes without water transmission or rupture of the membrane.
6. The average thickness of this covering shall be approximately 1/16".
7. Elongation over a crack shall be .22 inches.
8. Adhesion in shear shall be a minimum of 500 p.s.i.
9. Adhesion of the membrane to tile using the thin set method shall be a minimum of 500 p.s.i.
10. The membrane shall show no change after freeze-thaw cycling (250 cycles after cure).
11. The membrane system shall be listed on the current CTIOA tested material list.
All raw materials used to produce this waterproof covering shall be fire retardant, and therefore not represent a potential fire hazard and shall not emit solvents or other recognized pollutants into the atmosphere.
Compositions of oxychloride cement, epoxies, urethanes, PVC’s, PVA’s, silicones, solvent thinned elastomer solutions or combinations thereof will not be considered acceptable under this specification.
All materials used to formulate this coating shall be delivered to the job in unopened bags and pails labeled with the manufacturer’s name and address as well as the date of manufacture. All materials shall be completely pre-packaged and pre-blended at the factory.
Underlayment materials shall be Underlay-M or as approved by manufacturer.
Thin-set adhesive shall be Latex 200 and Filler 211.
Drains shall be a type approved by the membrane manufacturer as illustrated in their printed detail drawings.

*NOTE: CSI format specifications are available on floppy disc. Call any Mer-Krete office.

SPECIFICATION
SUBSURFACE PREPARATION

A. CONCRETE
Concrete must have a smooth and uniform finish free of dirt, grease, oils and film-forming curing compounds and be properly pitched for drainage as shown on plans and specifications (1/8" per foot minimum). The concrete mix for the slab shall have a sufficiently low water to cement ratio to insure the cohesive strength necessary to accept the overlay.

B. WOOD
Consult manufacturer.

C. THERMAL INSULATION OR OTHER SURFACES
Consult manufacturer.

INSTALLATION
This membrane covering shall be installed in strict accordance with the manufacturer’s printed application instructions and as outlined below:
1. Waterproof membrane and base flashings shall be applied directly to the sub floor. Apply a blend of Black Emulsion (11/2 gal.) and B.F.P. Filler (40 lb. sack) by trowel to the entire area to be waterproofed. Brush apply to all verticals (i.e. base, columns, etc.) and allow to dry.
2. Trowel apply a liberal coat of B.F.P. Mastic to the previously coated area. Roll in the reinforcing fabric, overlapping the fabric edges a minimum of 2" and turning up all base and flashing areas a minimum of 2". Apply an additional trowel coat of mastic to “sandwich” the fabric between coats of mastic and allow to cure overnight.
3. Trowel apply a final coat of the Black Emulsion and Filler blend to protect the membrane.

PROTECTION
After completion, the latex mastic membrane shall be adequately protected by the prime contractor against damage or misuse by other trades until final acceptance of the building.

WARRANTY:
The membrane covering shall be guaranteed against faulty workmanship and/or materials for a period of five years. See Mer-Krete warranty for specific requirements.