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GYP-SPAN RADIANT is a high strength, nonstructural gypsum concrete designed specifically to pour over hot water tubes or electrical cables.

GYP-SPAN Radiant is the only gypsum floor underlayment formulated with a heat inhibitor for Radiant Heating Systems listed in 50 separate assemblies in the UL Fire Resistance Directory.

Superior Thermal Mass
Uniform Heat Transfer
Flattens irregular Subfloors
Improves Sound Control
Seals Perimeter of Rooms
Smooth, Hard Surface
Eliminates Squeaks and Nail Pops
No Shrinkage Cracks
Energy Efficient
Nationwide Applicator Network

PART I GENERAL

1.1 Scope - Specify to meet project requirements

A. Work included:

1. GYP-Span Radiant
2. Hacker Floor Primer

1.2 Qualifications

A. GYP-Span Radiant must be installed by Licensed Applicators of Hacker Industries, Inc., using approved mixing and pumping equipment.
B. GYP-Span Radiant shall be delivered in original, unopened bags and protected from exposure to the elements after delivery.
C. Install after drywall unless otherwise specified.
D. Before, during and after installation of GYP-Span Radiant, the building interior must be ventilated and heated to a minimum of 50 F (approx. 10C).
E. Compressive strengths can be specified from 1800 P.S.I to 2500 P.S.I. (approx. 12.4 to 17.2 MPa).
F. All material specified herein shall be approved by Hacker Industries, Inc.

PART II PRODUCTS

2.1 Materials

A. Gypsum Concrete - GYP-Span Radiant as manufactured by Hacker Industries, Inc.
B. Hacker Floor Primer and Sealer (if required), as specified by Hacker Industries, Inc.
C. Sand: 1/8" (approx. 3 mm) 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 (1/360) 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 leakage.
C. Before installation, General Contractor shall inspect and approve the condition of the subfloor.

PART III EXECUTION

3.1 Condition of Subfloor

A. Subfloor must be structurally sound (L/360), 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 leakage.
C. Before installation, General Contractor shall inspect and approve the condition of the subfloor.

3.2 Priming

A. Plywood/OSB - Spray one coat Hacker Primer using one gallon (approx. 3.8L) per 500 square feet (approx. 46.5 sq.m).
B. Other substrata - Conditions may vary. Consult your local applicator for recommended floor preparation.

3.3 Mixing Instructions

A. 6 to 7 gallons (approx. 22.7 to 26.5L) of water and sand as specified per 80 pound (approx. 36.3 kg) bag of GYP-Span Radiant.

3.4 Underlayment Application

A. Application - GYP-Span Radiant can be installed in one or two lifts. The minimum thickness over radiant heating system in 3/4" (approx. 19 mm) over the top of the tubes or cables. Place as continuously as possible until installation is complete.
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 GYP-Span Radiant 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.

3.5 Field Quality Control

A. Sump Test: GYP-Span Radiant 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 8" (approx. 203 mm) 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 upon request.