Installation Instructions

4
SMART STEP INTREGRATED 1 PC (RISER
INCLUDED) RUBBER STAIR TREAD
INSTALLATION (cont)
Option 2 – Lapping the riser under the nose.
• If the riser extends beyond the top of the step, trim
the riser to ¼”-1/2” below the top of the step.
If the substrate is porous:
• Ensure substrate surface has been prepared
properly.
• Spread VPI 503 adhesive on tread, nose, riser and
cove stick, 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 nose 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 application to the nose. Note
higher ambient temperatures will result in the
adhesive curing faster, shortening the 30 minutes.
• Starting with the step edge lay the tread in place
working the profile up the riser and meeting the
next nose for a square step.
• Thoroughly roll the tread and riser 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.
If the substrate is nonporous:
• Ensure substrate surface has been prepared
properly
• Backside of treads must be sanded in all
nonporous applications; not sanding voids
warranty
• Spread VPI 503 adhesive on tread, nose, riser and
cove stick, using specified trowel, leaving between
½” to ¾” free of adhesive at the nose for
application of nose caulk. Allow the adhesive to
dry to the touch. When you run your fingers across
the trowel ridges, the ridges should be pliable with
moderate finger pressure. From the time the
adhesive is dry to the touch there are
approximately 45 minutes to lay the stair tread into
position. Do not allow the adhesive to dry too long
as loss of adhesion strength may occur!
• 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 nose so when
the nosing is pressed into place the compound 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.
• Starting with the step edge lay the tread in place
working the profile up the riser and meeting the
next nose for a square step.
• Thoroughly roll the tread and riser with a Gundlach
Airway #222 hand roller, being careful to not roll
the edge of the nose where the compound 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.