Owner Manual

ManualsBrandsMohawk Flooring ManualsFlooringRandhurst Oak 3/4" Thick x 5" Wide x 43" Length Solid Hardwood Flooring

Installation Instructions

For 3/4" Mohawk Solid Hardwood oors

NOTE: DO NOT USE A RUBBER MALLET TO INSTALL FLOORING. STRIKING THE SURFACE WITH A RUBBER MALLET MAY “BURN” THE FINISH CAUSING

IRREPARABLE DAMAGE.

Installing 3/4" Solid Hardwood over Concrete

Solid hardwood flooring can be installed on concrete slabs (minimum 3,000 psi) on or above grade. The moisture content of the slab should be tested with

a Calcium Chloride Test and emit less than 3 pounds per 1,000 square feet per 24 hours, then the appropriate subfloor (nailing surface) can be installed. An

installer should record moisture test results in the space provided on the last page of this document and leave with the owner as part of their records.

Method 1: Lay 3/4" or thicker exterior grade plywood over a vapor retarder of 6 mil poly or two layers of 15# felt and power nail into the concrete slab. The

ends of the plywood panels should be staggered 1/2 panel in alternating rows, and an expansion space of 1/2" should be left around the perimeter of the

room. An expansion gap of 1/8" must be left between the panels. The flooring may then be nailed to the plywood surface using 1-1/2" fasteners.

Method 2: Glue 3/4" or thicker exterior grade plywood to the vapor retarder that has been glued to the concrete floor. The vapor retarder and plywood

should be glued using cutback adhesive or other approved adhesive and applied according to the manufacturer’s directions. The plywood panels should be

cut down to 4' x 4' or 16" x 8' and the panel joints should be staggered by 2'. Score the backs of the panels 3/8" deep on a 12" grid, laying the scored side

into the adhesive, observing a 1/8" gap between the panels and a 1/2" space around the perimeter.

Method 3: As an alternative, a floating plywood base can be installed. In this method, lay a 6 mil poly vapor retarder on the floor, lapping the seams at

least 6". Loose lay 3/8" exterior grade plywood panels on the floor, allowing 1/8" between panels and 1/2" between the panels and walls or other

vertical surfaces and offsetting the ends by 1/2 panel. Lay a second layer of plywood at 90° angles to the first layer, allowing 1/8" between the panels

and 1/2" between the panels and walls or other vertical surfaces and offsetting the ends 1/2 panel. Staple the panels together with staples that have

crowns at least 14" and that do not penetrate the bottom layer in a pattern not exceeding 6" x 6". Lay an additional vapor retardant barrier over the

plywood panels and begin installation of the flooring.

Method 4: Flat, dry screeds or 2" x 4" boards of Group 1 softwood in random lengths from 18" to 48" may be used as a nailing base. The boards must be

preservative treated (suitable for interior use) and dried to no more than 12% moisture. The screeds should be adhered to the floor using suitable mastic adhesive

at 12" on center. Drape a 6 mil poly vapor retarder over the screeds and nail the flooring directly to the screeds, provided the flooring is less than 4" wide. For

flooring 4" wide and over, a wood subfloor must be applied over the screeds to provide adequate nailing surface. Either 5/8" CDX plywood or 3/4" OSB are

recommended for this application. In high moisture conditions such as coastal areas, an additional vapor retarder should be glued directly to the slab before the

screeds are installed in addition to the vapor retarder over the screed.

1st row nail

through face

T&G

15# feltPlywood subfloor

Solid flooring

Urethane finish

Subsequent rows

power nailed

Edge Profile