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Firm-Fill High Strength

From sprawling malls to sky-scraping office buildings, Firm-Fill High Strength resurfaces any cracked or damaged concrete to better than new.

From birdbaths to leveling an entire floor, from 600 to 40,000 sq. ft. (56 to 3716 sq. m) installed per day, from feather edge to 3 1/2 inches (89 mm) deep, Firm-Fill High Strength is the economical solution to correct your concrete problems.

With surface hardness superior to its competition, Firm-Fill High Strength provides a durable, flat floor for virtually any finished floor goods including hardwood floors, ceramic tile, carpet and pad, glued down carpet and vinyl.

2250 to over 3000 P.S.I
(approx. 15.5 to 20.7 MPa)
New Construction or Renovation
Strong, Smooth Surface
Over 50 UL Ratings
Superior Bonding Qualities
Superior Crack Resistance
Environmentally Safe
Consistent Quality
Trained, Licensed Applicators

PART I GENERAL

1.1 Scope - Specify to meet project requirements

A. Work included:

1. Firm-Fill High Strength
2. Hacker Floor Sealer & Primer

1.2 Qualifications

A. Firm-Fill High Strength must be installed by Licensed Applicators of Hacker Industries, Inc., using approved mixing and pumping equipment.
B. Firm-Fill High Strength shall be delivered in original, unopened bags and protected from exposure to the elements after deliver.
C. Install before or after drywall.
D. Before, during, and after installation of Firm-Fill High Strength, the building interior must be ventilated and heated to a minimum of 50 F (approx. 10 C)
E. All materials specified herein shall be approved by Hacker Industries, Inc.

PART II PRODUCTS

2.1 Materials

A. Gypsum Concrete - Firm-Fill High Strength as manufactured by Hacker Industries, Inc.
B. Hacker Floor Primer and Sealer C. Sand: 1/8" (approx. 3mm) or less washed plaster or mortar sand.
D. Water: Portable and free from impurities.

PART III EXECUTION

3.1 Condition of Subfloor

A. General Contractor is responsible for providing a structurally sound (L/360) subfloor, broom cleaned, and free of oil, grease or other contaminants.
B. All cracks and voids should be filled with a quick-setting taping compound to prevent leaking.
C. Before installation, General Contractor shall inspect and approve the condition of the subfloor.

3.2 Preparation of Subfloor

A. Priming: Prime concrete subfloors using Hacker Primer and/or Sealer.
B. Prepare subfloor meeting requirements of Hacker Renovation Specifications.

3.3 Mixing Instructions

A. 5 to 7 gallons (approx. 22.7 to 26.5 liters) of water and sand as specified per 80 pound (approx. 36.3 kg) bag of Firm-Fill High Strength, Do not over water Water amount will change with wetness of sand.
B. Firm-Fill High Strength mix proportions and methods shall be in strict accordance with Hacker recommendations. Firm-Fill High Strength is available in two mixing designs:

1. 2250-2500 P.S.I. (approx. 15.5 to 17.8MPa) - 1.9 cubic feet (approx. .054 cu.m) of sand per 80 lb. (approx. 36.3 kg) bag of Firm-Fill High Strength.
2. 2500-3000 P.S.I (approx. 17.2 to 20.7 MPa) - 1.4 cubic feet (approx. .040 cu.m) of sand per 80 lb. (approx. 36.3 kg) bag of Firm-Fill High Strength.

3.4 Underlayment Application

A. The minimum thickness of Firm-Fill High Strength varies with the type of floor system. Firm-Fill High Strength can be feather edged over all concrete substrates. Firm-Fill High Strength may be installed at a minimum depth of 1 1/2" (approx. 38mm) over extruded or expanded polystrene. The concrete slab must be 28 days or older and clean of grease or other contaminants.
B. Protection: After installation, temporary wood planking should be placed wherever the underlayment will be subject to heavy wheeled or concentrated loads.
C. Drying: Prior to the installation of finished floor goods, the Firm-Fill High Strength must be free from any moisture. The General Contractor shall provide continuous ventilation and adequate heat to rapidly remove moisture from the area until the underlayment is dry. General Contractor should consult flooring contractor for recommended procedures to test for dryness.
D. Firm-Fill High Strength is suitable for interior applications only and must be covered by a finished floor material.

3.5 Field Quality Control

A. Slump Test - Firm-Fill High Strength shall be tested for slump as it is being installed using a 2" by 4" (approx. 51 mm by 102 mm) cylinder. The patty size should be 7 1/2" (approx. 191 mm) plus or minus 1/2" (approx. 13 mm) in diameter.
B. Field Samples - Testing of molded cube samples shall be in accordance with ASTM: C472 using split brass molds. Prior to independent sampling, contact Hacker Industries, Inc., to insure proper ASTM methods are followed. Test results shall be available from the applicator upon request.