Signatory Floor Covering Contractors

Section 03300

PART 1. GENERAL

1.XX QUALITY ASSURANCE

A. Pre-Installation Conference: Schedule and administer pre-installation conference to review finishing techniques of concrete, use of additives, application of curing compounds, with attending Architect, job superintendent, concrete supplier, and concrete finishing subcontractor. Include inspection of the vapor barrier for proper joint seals, and no unsealed penetrations.

PART 2. PRODUCTS

2.XX WATER REDUCING ADMIXTURE

A. ASTM C494, Type A. All concrete slabs on grade contain a Type A admixture in the basic design with dosages high enough to reduce water by at least 10% from the same mix without the admixture. This admixture shall produce no retardation.

B. Products:

l. "WRDA-19" by Grace Construction Products.

2. "Polyheed" by Master Builders.

2.XX SLAB-0N-GRADE MIX DESIGN

A. 28 day minimum compressive strength of 3500 psi per ACI 301, with minimum cement of 564 lbs./cu.yd. and maximum water/cement ratio 0.42.

B. ASTM C33 fine aggregate and size No. 67 (3/4-inch to No. 4) coarse aggregate.

C. Maximum slump 5-inches with water reducing admixture.

PART 3. EXECUTION

3.XX EXAMINATION

A. Verify that no vapor barrier damage has occurred since the pre-installation conference inspection. Repair all damage to achieve complete and continuous vapor barrier membrane.

3.XX PREPARATION

A. Remove water from vapor barrier with portable high-speed air blowers just prior to slab-on-grade pour.

3.XX INSTALLATION

A. Install slab-on-grade screeds without penetrating the vapor barrier.

B. All interior slabs-on-grade shall contain water-reducing admixture.

C. Slab concrete shall be of a flowable consistency (5-inch slump with admixture), pumped and well tamped into place, and finishes compressed and compacted by troweling. Finish slab free from small hollows or bumps and graded to the elevations called for, with depressions in floors between high spots not greater than l/8-inch below a l0-foot straightedge in accordance with ACI 302 Surface Finish Tolerance, and not vary more than l/4-inch between opposite exterior walls, unless otherwise called for on the Drawings.

D. Slabs Under Floor Covering:

1. After wood floating and before final set occurs, steel trowel (single steel trowel preferred) with proper tools to provide a dense, hard, uniform surface. Finish hand troweling at edges of slab as required.

2. Concrete floor slabs receiving carpeting, resilient floor covering or other applied finishes shall be free of defects which will show through the covering. However, should such defects occur, correct by grinding or with an overlay of latex mastic, level the floor to meet the above requirements.

3. Inspection:

a. Pouring of concrete slabs on grade requiring a vapor barrier not permitted without an inspection and acceptance by Architect prior to pour. Contact Architect in ample time when ready to avoid delay of concrete pour.

ASTM P. O. Box C700 West Conshohocken, PA 19428 www.astm.org	Carpet & Rug Institute 310 Holiday Ave. Dalton, GA 30720 www.carpet-rug.com

Resilient Floor Covering Institute 40l E. Jefferson St., Suite 102 Rockville, MD 20850 Phone: 301-340-8580