Installation Guide
08.14.2017 | Page 5
Flexco Floors | 1401 E. 6th St. - Tuscumbia, AL 35674
P: 866.955.8291 | F: 419.436.4302 | excooors.com | Made in the USA
TECHNICAL DATA SHEET
RUBBER STAIR TREADS, RISERS & STRINGERS
Distinct Designs
in 10’. Substrates that do not meet this
requirement should have a compatible
cementitious patch (such as the Excelsior
CP-300) or self-leveling underlayment
(such as the Excelsior SU-310) installed to
flatten the installation area.
Do not use solvent/citrus based adhesive
removers prior to installation. Follow
The Resilient Floor Covering Institute’s
(RFCI) “Recommended Work Practice for
Removal of Existing Floor Covering and
Adhesive”, and all applicable local, state,
federal and industry regulations and
guidelines. When removing asbestos and
asbestos containing materials, follow all
applicable OSHA standards.
CONCRETE SUBSTRATES
All concrete must have a minimum
compressive strength of 3500 PSI and
be prepared in accordance with ASTM
F710. When flooring is being installed
directly over concrete, concrete surfaces
that have an ICRI Concrete Surface Profile
(CSP) over 4 should be flattened with a
self-leveling underlayment or a patch to
prevent imperfections from telegraphing
through flooring materials. On or below
grade concrete must have a permanent,
effective moisture vapor retarder installed
below the slab.
New or existing concrete substrates on all
grade levels must be tested in accordance
with ASTM F2170, using in situ Probes, to
quantitatively determine the amount of
relative humidity no more than one week
prior to the installation.
If ASTM F2170 test results exceed the
prescribed limits, a moisture mitigation
product, such as Excelsior MM-100
Moisture Mitigation, must be installed
prior to proceeding with installation.
Install The MM-100 per technical data
sheet at a rate of 400 sq. ft. per gallon.
When installing over concrete as moisture
mitigation, material must be applied in
two coats. Do not install flooring until
moisture testing has been conducted per
the appropriate standard and/or moisture
mitigation has been installed and is dry to
the touch. Do not install flooring in below
grade areas when hydrostatic pressure is
visible or suspected.
RESINOUS SUBSTRATES
When installing directly over a resinous
products, such as the Excelsior MM-
100 or an epoxy coating, ensure that
coating is dry to the touch and has
cured for the prescribed length of time.
Substrate must be clean, dry, sound and
free of contaminates. Ensure to follow
installation procedures and trowel sizes
for non-porous substrates.
GYPSUM BASED SUBSTRATES
Gypsum-based substrates must have a
minimum compressive strength of 3500
PSI. Gypsum substrates that do not meet
this requirement must have one coat
of the Excelsior MM-100 or equivalent
installed to improve the tensile/pull-off
strength of the substrate. Substrate must
be structurally sound and firmly bonded
to subfloor. Any cracked or fractured
areas must be removed and repaired
with a compatible patch or repair product.
Follow instructions for installation over
a gypsum substrate. New or existing
gypsum substrates may require a sealant
or primer. Follow all manufacturer’s
recommendations regarding preparation
for resilient flooring installation.
WOOD SUBSTRATES
Wood substrates must be constructed per
federal, state and/or local building codes.
Wood substrates should have a minimum
thickness of 1”. If plywood is being used,
ensure plywood is Underlayment Grade
with a minimum thickness of 1/4” and
is fully sanded prior to installation. When
stairs may be subjected to moisture, use
an APA approved exterior grade plywood.
Other wood materials, such as OSB,
lauan, particleboard, chipboard, fiberboard
or cementitious tile backer boards,
are not acceptable substrates. Avoid
preservative-treated and fire-retardant
plywood, as some may be manufactured
with resins or adhesives that may cause
discoloration or staining of materials. Do
Adhesive RH Limits
AW-510 Acrylic Wet-Set: 90% RH
TP-620 Tape Adhesive: 80% RH
C-630 Contact Adhesive: 85% RH
MS-700 Modified Silane: 95% RH
EW-710 Epoxy Wet-Set: 90% RH
as radiators, ovens or other high-heat
equipment. May be susceptible to staining
from harsh disinfectants, cleaning agents,
dyes or other harsh chemicals – ensure all
chemicals and materials that may come
in contact with stair treads, risers or
stringers will not stain, mar or otherwise
damage the material prior to use.
3. SUBSTRATE PREPARATION
All substrates must be prepared according
to ASTM F710, as well as applicable ACI
and RFCI guidelines. Substrates must
clean, smooth, permanently dry, flat, and
structurally sound. Substrates must be
free of visible water or moisture, dust,
sealers, paint, sweeping compounds,
curing compounds, residual adhesives
and adhesive removers, concrete
hardeners or densifiers, solvents, wax,
oil, grease, asphalt, visible alkaline salts
or excessive efflorescence, mold, mildew
and any other extraneous coating, film,
material or foreign matter.
All substrates must have any and all existing
adhesives, materials, contaminants or
bond-breakers mechanically removed via
scraping, sanding or grinding. Mechanical
preparation must expose at least 90%
of the original substrate. Following
cleaning and removal, all substrates
must be vacuumed with a flat vacuum
attachment or damp mopped with clean,
potable water to remove all surface dust.
Sweeping without vacuuming or damp
mopping will not be acceptable.
All porous substrates must be tested per
ASTM F3191 to confirm porosity. Use a
pipette or equivalent to conduct three
tests by placing a .05 mL (1/4” wide)
droplet of clean, potable water onto the
surface. If the substrate absorbs water
within 60 seconds, the substrate is
considered porous. Conduct 3 tests for
the first 3000 sq. ft. and one for each
additional 2000 sq. ft., at least one per
room. All other substrates that do not
meet this requirement are considered
non-porous. Ensure that all non-porous
substrates are not contaminated with any
aforementioned contaminates.
It is recommended that all substrates
have a floor flatness of FF32 and/or a
flatness tolerance of 1/8” in 6’ or 3/16”