(continued)
8/30/04
86
(800) 525-BR111(2711)
•
Fax (800) 577-2711
•
www.br111.com
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STEP 7: PREPARATION FOR SPECIFIC SUB-FLOOR TYPES
Sub-Floor Type: Concrete Slabs
Float or Glue-Down Application — B R-111
™
5/16" Engineered can be glued directly to high compression strength
concrete slabs or floated using the appropriate adhesive. If glue-down application, BR-111
™
recommends using StrateStuff
Adhesive in conjunction with StrateStuff Substrate Safeguard for an added moisture protection warranty. See StrateStuff
product labels and literature for details. Please carefully read and follow the manufacturer’s instructions. If floating
application, a moisture barrier is required (StrateStuff Safeguard is recommended; 8 mil polyethylene film minimum) along
with the appropriate foam padding.
Unless using the StrateStuff system (StrateStuff Urethane Adhesive and StrateStuff Substrate Safeguard), do not use any other
concrete sealer or install over existing sealers.
All concrete sub-floors must be tested for moisture content, especially adjacent to exterior walls and plumbing fixtures.
Visual checks are not acceptable. Please refer to the “Step 5: Testing for Moisture Content” section. Regardless of current
moisture readings, BR-111
™
recommends applying StrateStuff Substrate Safeguard to protect against future sub-floor
moisture fluctuations.
Sub-Floor Type: Acoustic Concrete
Float or Glue-Down Application — Acoustic concrete sub-floors must have a minimum compressive strength of 2500 PSI.
Because acoustic concrete contains large quantities of gypsum, the surface must first be coated with a primer/surface
hardener as recommended by the concrete manufacturer. If floating application, a moisture barrier is required (StrateStuff
Safeguard is recommended; 8 mil polyethylene film minimum) along with the appropriate foam padding. Perform
appropriate moisture tests.
Sub-Floor Type: Plywood (or equivalent) Over Concrete
Float or Glue-Down Application — A suitable moisture barrier (recommended StrateStuff Substrate Safeguard, minimum
8 mil poly film) must be established over concrete with joints overlapped 18" and taped, followed by installation of 3/4"
(preferred) plywood or equivalent (see “Recommend Sub-Flooring” section).
Allow 1/2" expansion space with the plywood (or equivalent) around all vertical objects and sub-floor panels should be
spaced 1/8" apart to allow for expansion. Using pneumatic or power-actuated fasteners, attach sub-flooring to concrete
with a minimum of one fastener per square foot. Perform appropriate moisture tests.
Sub-Floor Type: Plywood (or equivalent) Over Wood Structural Panel
Glue-Down Application — In glue-down applications, a moisture barrier is not required unless moisture readings from the
sub-floor are at unacceptable levels (please refer to “Step 5: Testing for Moisture Content”).
Minimum thickness sub-floor material recommendations are satisfactory for 16" on center joist spacing. Thicker sub-floor
recommendations will allow up to 19.2" joist spacing. When joist spacing is greater than 19.2" on center, flooring will exhibit
minimum performance. Minimum performance may result in movement, gaps, and/or noises. A second layer of sub-
flooring material bringing the overall thickness to 1" – 1 1/8", will provide optimum results when joist spacing exceeds 19.2"
on center. Hardwood flooring should, whenever possible, be installed perpendicular to flooring joists. Perform appropriate
moisture tests.
Floating Application — If floating application, a moisture barrier is required (StrateStuff Safeguard is recommended; 8 mil
polyethylene film minimum) along with the appropriate foam padding. Perform appropriate moisture tests.
Engineered
