SUB FLOOR PREPARATION
Make sure you remove all foreign material from the concrete. To remedy any surface irregularities, #3-1/2 grit open coat paper may need to be used to grind a concrete floor. This will loosen any dirt, loose concrete or contaminates. Thoroughly sweep and vacuum and make sure that all previously or existing glue or adhesives are removed before installing new hardwood flooring. Any irregularities and undulations may cause any wood flooring to develop hollow spots between the flooring and the sub floor. Keep in mind that these hollow spots are not the result of any manufacturing defect in the flooring and are not covered by the Lighthouse Custom Wood Company’s warranty.
MAKE CERTAIN BUILDING INTERIOR AND SUBFLOOR ARE DRY
WHEN TO INSTALL: Lay only after sheetrock and tile work are thoroughly dried!and all but the final woodwork and trim have been completed. The building interior should have been dried and seasoned to a comfortable living environment and installation should be done in a similar, comfortable working environment. As part of your sub floor preparation remove any existing base, shoe mold or doorway thresholds. These items can be replaced after installation, but should be replaced in such a way as to allow room for expansion around the perimeter of the room. All!door casings should be notched out or undercut to allow for expansion and to avoid difficult scribe cuts. This is easily done by placing a piece of the engineered product on the sub floor as a height guide for your handsaw of jamb saw.
Interior walls should be dry enough to be painted and a room temperature as required by adhesive manufacturer with a relative humidity of 30-50% should be provided before any installation begins. To determine if a concrete slab is suitable for hardwood flooring, please follow the NWFA guidelines to perform a Calcium Chloride test. If excessive moisture is present, do not lay flooring. Check floor in several locations. Concrete sub floors must be clean, flat and sound and of sufficient compression strength (3000lbsPSI) being sure that the surface is not slick. Sections not flat such as waviness, trowel marks, etc. are to be eliminated by grinding or the use of an acceptable leveling compound. Especially along the walls, the sub floor flatness must be checked and, if necessary, improved. Flat to 1/8” in an 8’ radius. In addition to concrete sub floors, these products can be installed over dry, flat wood sub floors, such as plywood. If plywood is used as an overlay over an existing sub floor, the thickness of the overlay material must be such as to yield a total 3?4” sub floor thickness. New wood type sub floors should also be checked for moisture using a moisture meter. In general, wood or plywood sub floors should not exceed 12% moisture content or 4% moisture content difference between wood flooring and sub floor.
WET LAY INSTALLATION
When using this method, flooring is placed into “wet” adhesive and workers do not walk on wood. Do not walk on fresh laid flooring. Proper humidity must be controlled between 30-50% for successful performance during and after installation.
Lighthouse Custom Wood Co. recommends the following or equivalent:
- Bostik’s Best Urethane Wood Flooring Adhesive with 3/16”W x 5/32”D V-groove Trowel / Bostik’s #9 Trowel
- Franklin 811 Plus Urethane Wood Flooring Adhesive and Titebond Advantage Urethane Wood Flooring Adhesive with 3/16”W x 1/4”D x 1/2” V-notch Trowel / Franklin 811 Trowel.
INSTALLING THE FLOOR
Flooring should be installed from several boxes at the same time to achieve a uniform look. Install tongue into groove. To ensure a random pattern, make sure butt joints are at least!6” from the butt joint of the prior row. Proceed until you have come to the final row to complete the room. When you have reached the final row, you will need to measure the width of the final planks. You may need to rip the planks to match the width of the space remaining. The tongue of the final row will need to be removed for a clean fit. Use a “Last Board Puller”!to snug the last row of planks with the completed second row. Lift a plank periodically to check for adhesive transfer (approx 80% glue to flooring). It is recommended to roll and/or weight floor as required after installation to insure glue transfer and proper adhesion. Please refer to the NWFA Technical Manual, your Lighthouse Custom Wood Co. Distributor, and/or the adhesive manufacturers for installation support.