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Firm-Fill 4010 is a cementitious underlayment from Hacker Industries, Inc., designed for thin capping concrete in new construction or over damaged concrete on renovation projects.

With compressive strengths from 3000 to 5500 psi (approx. 20.7 to 37.9 MPa), Firm-Fill 4010 will provide concrete floors with new life and exceptional surface hardness.

In today's market, tenants and owners demand both flat and durable floors in their offices and living spaces. Firm-Fill 4010 provides the cost-efficient solution - a strong, smooth surface for finished floor goods.

PART I GENERAL

1.1 Scope - Specify to meet project requirements

A. Work included:

1. Firm-Fill 4010
2. Hacker Floor Sealer & Primer

1.2 Qualifications

A. Firm-Fill 4010 shall be installed by Licensed Applicators of Hacker Industries Inc., using approved mixing and pumping equipment.
B. Firm-Fill 4010 shall be delivered in original, unopened bags and protected from exposure to the elements after delivery.
C. Install before or after drywall.
D. Before, during and after installation of Firm-Fill 4010, the building interior must be ventilated and heated to a minimum of 50 F (approx. 10 C).
E. Compressive strengths can be specified from 3000 psi to 5500 psi (approx. 20.7 to 37.9 MPa)
F. All material specified herein shall be approved by Hacker Industries, Inc.

PART II PRODUCTS

2.1 Materials

A. Firm-Fill 4010 as manufactured by Hacker Industries, Inc., Newport Beach, CA
B. Hacker Floor Primer and Sealer
C. Sand: Silica Sand Aggregate and/or Washed Plaster Sand (ASTM E-11)
D. Mix water: Portable and free from impurities.

PART III EXECUTION

3.1 Condition of subfloor

A. General Contractor shall provide a structurally sound subfloor, broom clean, and free from oil, grease or other contaminants. Concrete must be 28 days or older.
B. 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 Floor Primer and/or Sealer.
B. Prepare subfloor meeting requirements of Hacker Renovation Specifications.

3.3 Mixing Instructions

A. 5 to 6 gallons (approx. 19.0 to 22.7 liters) of water and sand as specified per 80 pound (approx. 36.3 kg) bag of Firm-Fill 4010. Do not over water. Water amount will change with wetness of sand.
B. Firm-Fill 4010 mix proportions and methods shall be in strict accordance with Hacker recommendations. Firm-Fill 4010 is available in two mix designs:

1. 3000 - 3700 psi (approx. 20.7 to 25.5 MPa) - 1.8 cubic feet (approx. .051 cu.m) of sand per 80 lb. (approx. 36.3 kg) bag of Firm-Fill 4010.
2. 3700 - 5500 psi (approx. 25.5 to 37.9 MPa) - 1.4 cu ft. - 1.0 cu ft., (approx. .040 -.028 cu.m) of sand per 80 lb. (approx. 36.3kg) bag of Firm-Fill 4010.

3.4 Underlayment Applications

A. The minimum thickness of Firm-Fill 4010 varies with the type of concrete floor system. Firm-Fill 4010 can be feather edged over all concrete substrates.
B. Install Firm-Fill 4010 at specified minimum thickness scrapping to a smooth surface. Place as continuously as possible until installation is complete so that no Firm-Fill 4010 is placed against Firm-Fill 4010 that has obtained its initial set, except at authorized joints.
C. Protection: After installation, temporary wood planking should be placed wherever the underlayment will be subject to heavy wheeled or concen- trated loads.
D. Drying: Prior to the installation of finished floor goods, the Firm-Fill 4010 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. Consult flooring contractor for recommended procedures to test for dryness.
E. Firm-Fill 4010 is suitable for interior applications only and must be covered by a finished floor material.

3.5 Field Quality Control

A. Sump Test: Firm-Fill 4010 shall be tested for slump as it is being installed using a 2" by 4" (approx. 51 mm by 102mm) cylinder. The patty size should be 7" (approx. 178mm) plus or minus 1/2 (approx. 13mm) 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 on request.

A Detailed Warranty Statement Should be Requested From Hacker Industries, Inc., And Licensed Applicators.