Installation Instructions

5
REGULAR RUBBER STAIR TREAD AND RISER
INSTALLATION
--NOT USING VPI BRANDED ADHESIVE AND NOSE CAULK IN
ALL INSTALLATIONS, OR FAILURE TO SAND (ROUGH UP) THE
BACK OF EACH TREAD BEFORE INSTALLATION ON NONPOROUS
SUBSTRATES, ALONG WITH ANYTHING THAT DEVIATES FROM
THESE INSTRUCTIONS, VOIDS WARRANTY COVERAGE.
• Regular rubber stair tread must be trimmed to fit
and dry laid on each step prior to any adhesive
application. Each step in the staircase may have
a different width and depth.
• Make sure all conditions are met regarding surface
preparation before starting the installation.
• Scuff back of tread and under nose with 60 grit
sandpaper prior to installation is required in all
nonporous installations.
• Wipe the back of each tread with a clean dry cloth
to remove any debris.
• For Raised Round patterned treads, if pattern
alignment is desired, the same point should be
aligned in the center of the step for visual
alignment. An extra 1.5” length of tread is
provided for visual alignment and end squareness.
• All other patterns can be cut by measuring the
step and cutting the stair tread. Cut all treads 1/16”
short on both ends and 1/16” short in depth to
allow for expansion. VPI stair treads are
manufactured with the intent that one or both ends
of the treads will need to be trimmed to properly fit
the step. Each step must be dry laid to ensure
proper fit.
• Risers are cut and dry fit with the same methods
as used for the treads.
• If using the Butt Joint method, you will need to
place the tread nose over the riser. Then scribe
the cut line using the nose as the guide. Trim the
riser with the appropriate cutting method.
• Use VPI 100 to adhere the riser to the substrate.
• If using the Lap Joint method, trim the riser to ¼”
to ½” below the top of the step to allow space for
the Epoxy Nose Caulk. Using this method requires
laying the riser prior to laying the tread.
• Use VPI 100 to adhere the riser to the substrate.
If the substrate is porous:
• Ensure substrate surface has been prepared
properly.
• Spread VPI 503 adhesive on tread and nose,
using specified trowel, leaving between ½” to ¾”
free of adhesive at the nose for application of nose
caulk. Allow the adhesive to flash off for 5 – 10
minutes.
• Apply NC-2 Epoxy Nose Caulk to the inside of the
tread nose and on the face of the step edge to
adequately fill the void. Cut the mixing nozzle to
an inside diameter of 3/8”. Do Not Remove the
internal mixer. Remove the end cap and attach
the mixing nozzle with the retaining nut to the
cartridge. Purge the mixing nozzle before each
use with approximately 1” to 2” of compound,
dispose of the purge material. The filler is ready
for use. Coverage will be approximately 25 linear
feet with a 3/8” bead. Cartridges with remaining
compound may be reused again by replacing the
mixing nozzle at the time of your next use.
• Apply enough caulk inside the tread/nosing so
when the nosing is pressed into place the caulk
will conform to the step edge & achieve 100%
contact between the nosing area and the step
edge. Leave ½” along each side of the tread free
of any compound. The NC-2 needs to be
positioned within 30 minutes of applying to the
nose. Note higher ambient temperatures will result
in the adhesive curing faster, shortening the 30
minutes.
• Thoroughly roll the tread with a Gundlach Airway
#222 hand roller, being careful to not roll the edge
of the nose where the caulk has been applied.
Rolling the nose will displace the compound and
reduce the compound’s performance.
• Wipe up spills with mineral spirits and clean cloths
before any adhesive or compound sets up.