RECOMMENDED SPECIFICATION FOR GYP-CRETE 2000®/3.2K FLOOR UNDERLAYMENT OVER ACOUSTI-MAT® II SOUND DEADENING PAD
Summary
This is the recommended specification for Gyp-Crete 2000/3.2K Floor Underlayment over
Acousti-Mat II sound deadening pad.
Section Includes
- Gyp-Crete 2000/3.2K gypsum cement
- Acousti-Mat II
- Maxxon Floor Primer
- Maxxon Overspray
Quality Assurance
Gyp-Crete 2000/3.2K Installer's Qualifications: Installation of Gyp-Crete 2000/3.2K shall be by
an applicator authorized by the Maxxon Corporation using Maxxon approved mixing and
pumping equipment.
Acousti-Mat II Installer's Qualifications: Installation of Acousti-Mat II shall be by an applicator
authorized by the Maxxon Corporation.
DELIVERY, STORAGE AND HANDLING
General Requirements: Materials shall be delivered in their original, unopened packages, and
protected from exposure to the elements. Damaged or deteriorated materials shall be removed
from the premises.
SITE CONDITIONS
Environmental Requirements: Before, during and after installation of Gyp-Crete 2000/3.2K and
Acousti-Mat II, building interior shall be enclosed and maintained at a temperature above 50
degrees F (10 degrees C).
Products
Materials
Gypsum Cement: Gyp-Crete 2000/3.2K floor underlayment gypsum cement as manufactured by
the Maxxon Corporation, Hamel, MN. All others must receive prior approval.
Sound Deadening Pad: Acousti-Mat II as manufactured by the Maxxon Corporation, Hamel,
MN.
Sand Aggregate: Sand shall be 1/8 inch (3 mm) or less, washed masonry or plaster sand, meeting
requirements of Maxxon Corporation Sand Specifications 101.
Mix Water: Potable, free from impurities
Subfloor Primer: Maxxon Floor Primer
Sealer: Maxxon Overspray
EXECUTION
PREPARATION
Condition and Cleaning of Subfloor: Subfloor shall be structurally sound. General Contractor
shall clean subfloor to remove mud, oil, grease, and other contaminating factors before the arrival
of the Gyp-Crete 2000/3.2K crew.
Leak Prevention: Fill cracks and voids with a quick setting patching or caulking material where
leakage of Maxxon could occur.
Expansion Joints: Allow joints to continue through the Gyp-Crete 2000/3.2K at the same width.
APPLICATION OF ACOUSTI-MAT II
Acousti-Mat II Installation: Install Acousti-Mat II following manufacturers recommendations
and specifications.
APPLICATION OF CEMENTITIOUS FLOORING
Scheduling: Application of Gyp-Crete 2000/3.2K shall not begin until the building is enclosed,
including roof, windows, doors and other fenestration. Install after drywall installation unless
tenant finish requirements identify partitioning after the pour. If Acousti-Mat II is to be
installed before drywall, then 3.4 lb. sq. yd. galvanized metal lath must be loose laid over the
entire Acousti-Mat II surface. Schedule the Acousti-Mat II sound control system as late as
possible in the construction cycle.
Priming Acousti-Mat II: Prime Acousti-Mat II using the Maxxon Floor Primer to bond the
Maxxon to the mat.
Application: Place Gyp-Crete 2000/3.2K a minimum 1 inch (25 mm) thick over Acousti-Mat II.
Spread and screed Maxxon to a smooth surface.
Drying: General Contractor shall provide continuous ventilation and adequate heat to rapidly
remove moisture from the area until the Gyp-Crete 2000/3.2K is dry. General Contractor shall
provide mechanical ventilation if necessary. Under the above conditions, for 1 inch (25 mm)
thick Gyp-Crete 2000/3.2K, 7-10 days is usually adequate drying time. To test for dryness,
tape a 24 inch by 24 inch (609 mm by 609 mm) section of plastic or high density rubber mat to
the surface of the underlayment. After 48-72 hours, if no condensation occurs, the underlayment
shall be considered dry. Perform dryness test 5-7 days after pour.
PREPARATION FOR INSTALLATION OF GLUE DOWN FLOOR GOODS
Sealing: Seal all areas that receive glue down floor goods with Maxxon Overspray according to
the Maxxon Corporation's specifications. Any floor areas where the surface has been damaged
shall be cleaned and sealed regardless of floor covering to be used. Where floor goods
manufacturers require special adhesive or installation systems, their requirements supersede
these recommendations.
Floor Goods Procedures: See the Maxxon Corporation's "Procedures for Attaching Finished
Floor Goods to Maxxon Underlayments" brochure for guidelines for installing finished floor
goods. This procedure is not a warranty and is to be used as a guideline only.
FIELD QUALITY CONTROL
Slump Test: Gyp-Crete 2000/3.2K mix shall be tested for slump as it's being pumped using a 2
inch by 4 inch (50 mm by 101 mm) cylinder resulting in a patty size of 8 inches (203 mm) plus
or minus 1 inch (25 mm) diameter.
Field Samples: At least one set of 3 molded cube samples shall be taken from each day's pour
during the Gyp-Crete 2000/3.2K application. Cubes shall be tested as recommended by the
Maxxon Corporation in accordance with modified ASTM C 472. Test results shall be available
to architect and/or contractor upon request from applicator.
PROTECTION
Protection From Heavy Loads: During construction, place temporary wood planking over
Gyp-Crete 2000/3.2K wherever it will be subject to heavy wheeled or concentrated loads.