Greenwood Bamboo

Installers are the last step in quality control and are required to inspect each plank prior to nailing or gluing it in place. The National Wood Flooring Association standard for off-quality product is 5%. Many of these off-quality planks can be used as starter pieces or fillers. We will exchange any planks in excess of 5%.

Excessive Moisture or lack of moisture is the primary factor of wood flooring failures. Although bamboo flooring is somewhat more resistant to problems caused by moisture than solid wood flooring. The standard "solid bamboo", it is not an engineered floor but rather an assembled floor and you should use the same installation guidelines as you would for a solid wood floor. Greenwood stocks several type engineered products (a bamboo wear surface laminated to a plywood base). Engineered wood of any species or bamboo is inherently more stable than a solid version of the same species. However, these are limits to how any floor covering specie will perform with excessive moisture or absence of moisture.

• General conditions: In area to be installed, temperature and humidity shall be brought to normal occupancy levels for a minimum of 72 hours before installation and maintained at those levels after installation. Some areas may require more time for proper acclimation. Be sure the job is closed in, with all outside windows and doors in place. Excessive moisture caused by the slab or plaster drying out should be dissipated before the flooring is placed at the job-site. Flooring should be removed from the box and allowed to acclimatize on site at least 72 hours before installation.  Be sure to use your moisture meter to check moisture levels in both the sub-floor and the bamboo flooring before installation. If there is a THREE- percent (3%) OR MORE difference between the two, DO NOT INSTALL THE FLOORING UNTIL THE DIFFERENCE IS LESS THAN THREE PERCENT.
   
• Applications: May be nailed or glued down over wood sub-floors or glued directly to concrete sub-floors on, above, or below grade. May be floated within certain dimensional limitations (not to exceed 16’ in width without an expansion gap for solid bamboo construction) and with a proper moisture barrier.
   
• Sub-floor: Surfaces shall be clean, dry, smooth (maximum 1/8" variance over 8 lineal feet) and free of dirt, wax, oil, paint, curing agents and other contaminants that would interfere with adhesive bond. Old resilient floors can be covered provided above conditions apply. Wood sub-floors shall be sanded level prior to new installation. Concrete sub-floors shall have all cracks and holes filled with a cementitious patching material (Ardex or equal). Concrete sub-floors must be tested for moisture and not exceed three (3) pounds per 1,000 square feet using the calcium chloride test.

• It is incumbent upon the installer to protect the floor from possible damage by other trades by using heavy kraft paper or equivalent.
   
• Moisture: While bamboo flooring is much more stable than most woods, it is still subject to damage when in direct contact with a constantly wet slab. The bamboo shall be isolated from this type of slab by use of a moisture barrier, plywood on slab, or a sleeper sub-floor.  Urethane adhesive will usually fail when vapor pressure exceeds 3 pounds per 1000 sq. ft. in 24 hours as measured by the calcium chloride test. Bamboo flooring cannot be glued down under those conditions.

1  Plywood on Slab -DO NOT USE THIS METHOD IF YOU ARE GOING OVER RADIANT HEATING PIPES.

1. Cover the slab with a vapor barrier. Do this by either priming the slab or applying cold, cutback asphalt mastic with a notched trowel (50 sq. ft. per gallon). Allow mastic to set for two hours. Unroll 15-pound asphalt felt or building paper, lapping the edges 4" and butting the ends. Apply a second coating of mastic over the asphalt or paper and roll out a second layer of asphalt or paper in the same direction as the first, staggering the overlaps to achieve an even thickness.
   OR
   Cover the entire slab with a 4 to 6 mil polyethylene film, overlapping the edges 4" to 6" and allowing enough film to extend under the baseboards at all sides. Under severe conditions, the film should be laid into mastic, which has been fine-troweled (100 sq. ft. per gallon). Always walk the film flat and puncture bubbles to release trapped air.
    

    

2. Install ¾" x 4’ x 8’ exterior grade plywood panels diagonally across the direction of the finished floor after the vapor barrier is in place. Leave a ¾" space at the wall line and ¼" to ½" between the plywood sheets. Fasten the plywood to the slab by using power-actuated fasteners starting with the middle of the plywood and then the edges, using 9 or more fasteners per panel. The bamboo planks may now be nailed or glued to the plywood, leaving a 1/4" expansion space from base plate or wall.

2  Sleepers

Sweep the slab clean and apply an asphalt primer, allowing it to dry. Install flat, dry, preservative treated, random length 2" X 4" sleepers (18" to 48" in length) on their flat faces into rivers of hot (poured) or cold (cut-back) asphalt mastic, in rows 12" on center at a right angle to the direction of the finished flooring. Stagger the end joints, overlapping the ends of the spacers by 4" with a ¼" space in between. Loosely lay a 4 or 6 mil polyethylene vapor barrier over the sleepers, overlapping the edges on top of the sleepers. Avoid bunching or puncturing the film. Nail the flooring through the film.