Laminated hardwood block flooring

3.1 General. All laminated hardwood block flooring represented as complying with this Standard shall meet all of the requirements specified herein.

3.2 Wood species. Veneers for the plies formingthe laminated flooring shall be of one or more hardwood species. Laminated hardwood block flooring is generally available in the following species which are listed in accordance with their relative hardness and inherent wearing capabilities: pecan, hard maple, oak (red and white), birch, ash, beech, walnut, and cherry.

3.3 Grade Descriptions. The gade of the veneer used for laminated hardwood block flooring shall be in accordance with the following grade descriptions. A tolerance of 5Vo shall be permitted in the grading.

3.3.1 Grading requirements for face veneers. The veneers shall be either prime grade or standard grade. They shall be smooth, tight cut, and contain the natural character markings inherent in the species. For prime grade blocks only, when the face is to be made up of two pieces of veneer, the veneers shall be matched at the joints to avoid sharp color and grain contrasts.

3.4 Glue Bond. All adjacent surfaces of each ply in each block shall be uni formly and securely bonded over the entire area. The block shall not delaminate when tested according to 4.2.

3.5 Construction. The blocks shall be made of three, four, or five plies. The

Story at a Glance

Details on the requirements and finish provisions of the new American National Standard for laminated hardwood block flooring is abstracted here from the ANSI standard 010.2-1975.

direction of the grain ofeach ply shall be approximately at right angles to the grain of the adjacent plies, except in 4-ply blocks, the grain of the two center plies shall run in the same direction. All plies, except the center ply, shall occur in pairs. The two plies of each pair and the two center plies of 4-ply blocks shall be of the same species, or species with similar shrinkage characteristics, and the same thickness. The blocks shall be free from warp or twist to the extent that they do not interfere with installation, and in no case will warp including bow, cup and twist exceed l/8" in the plane of the block itself. The amount of bow, cup and twist shall be measured by placing a straight edge on the suspected concave face at any angle and measurement shall be made at the point of maximum distance between bottom of straight edge and block. No coinciding openings greater than l12" in average dimension shall be permitted in adjoining plies.

3.6 Veneer Thickness. In either 3-ply or 4-ply construction, the face ply shall not be less than 1/8" in thickness before sanding and an average thickness of .105" (+.005") after sanding. In 5-ply'construction, the face shall not be less than 1/10" before sanding and an average thickness of .085 " (I.OOS "; after sanding.

3.7 Edges. The edges of the face ply of factory finished flooring shall have a uniform bevel not exceeding lf 16". Unfinished flooring shall be squareedged. Each block shall have a tongue or corresponding groove on each of the four edges which will provide intermembering with each adjacent block.

3.8 Moisture Content. The average moisture content of the blocks shall be between 5-12% at the time of shipment from the manufacturer's plant: no more than 5% of the blocks in any one shipment shall be outside this range. The moisture content shall be determined in accordance with 4.3

3.9 Finish

3.9.1 Unfinistred flooring. The face of unfinished flooring shall conform to the grade deqcriptions in 3.3 I

3.9.2 Factory finished flooring. The type of finish used shall be as decided upon between the purchaser and the seller. The finish coating on the face of factory finistred flooring shall be smooth, clean, clear, uniform, and without blisters, pits, wrinkles, runs, sags, or tackiness. Staining, where used, shall be uniform and well-blended.

3.10 Dimensions. The conventional size of laminated blocks is 9" x 9" plus or minus l/64" in length and width, and the conventional thickness is 15132" plus or minus I /64".

3.ll Squareness. The length of the face diagonals of each block shall not vary more than | 132"

3.12 Packaging. The laminated hardwood block flooring shall be packaged in such a manner as to provide reasonable protection against damage in ordinary handling and transpertation. Only blocks of the same classification (see 2.2) and size shall be in any one package (see 3.14 for package marking). Each package shall contain a sheet of printed installation instructions (see 3.13) and shall be labeled to indicate that installation instructions are Drovided in the package.

3.13 Installation Instructions. The instruction sheet shall give full and complete directions for: the proper areas of laminated block application: the preparation, water proofing , and sound proofing of the subflooring, when applicable; the equalization of moisture contentl the type and application of the adhesive: the laying of the flooring: and the sanding and finishing procedures, when applicable. If the instructions provide for the installation of laminated hardwood block flooring over sound deadening materials, the manufacturer shall provide specific recommendations for the type and installation of the underlayment.

3.14 Marking. Each package of lami nated hardwood block flooring shall be marked with the symbol of this Standard, ANSI 010.2; the name or recognized identification of the producer: the species: the grade and whether finished or unfinished blocks: and block size: the number of blocks in the package: and the total square footage (surface measure) of flooring in the package.

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