For Use With

• Integrated Stair Treads

Adhesive Summary

Product	Adhesive	Comment
Integrated Rubber Stair Treads	S-726 Stair Tread & Landing S-727 Stair Tread Epoxy Caulk S-728 Static Mixer Nozzle for Epoxy Caulk	Roll Stair Treads with a Hand Roller

Recommended Substrates

All substrates listed below must be properly prepared.

• Concrete
• Wood Underlayments
• Metals
• Ceramic Tile
• Terrazzo
• Marble

Job Conditions

Substrates must be dry, clean, smooth and free from paint, varnish, oils, existing adhesive residue*, wax and other foreign matter.  Level uneven stairs, except for wood, with S-194 Latex Underlayment mixed with S-195 Underlayment Additive. Repair worn or uneven edges.  Wooden stairs must be flat and firmly nailed. Thermoplastic Rubber Stair Treads are available in square nose profile only.

Thermoplastic Rubber Stair Treads are not recommended over existing resilient floor covering or in areas where they will be exposed to direct sunlight.

Subfloors/underlayments shall be dry, clean and smooth. They shall be free from paint, varnish, solvents, wax, oil, existing adhesive residue* or other foreign matter. For more detailed requirements of concrete, wood and metal subfloors, as well as wood and trowelable underlayments, refer to the Armstrong Guaranteed Installation Systems manual, F-5061, Section IV., Subfloors and Underlayments.

Calcium Chloride Tests for moisture must be conducted. Armstrong offers a guideline of a maximum acceptable moisture emission level of 3.0 lbs. per 1000 sq. ft. per 24 hours. Bond Tests should also be conducted for compatibility with the substrate. When testing for alkalinity, the allowable readings for the installation of Armstrong flooring are 5 to 9 on the pH scale.

Temperature shall be maintained at a minimum of 65° F (18° C) and a maximum of 85° F (29° C) for 48 hours prior to installation, during installation and 48 hours after completion. A minimum temperature of 55° F (13° C) shall be maintained thereafter. Condition all flooring materials and adhesives to room temperature at least 48 hours prior to starting installation. Protect all materials from the direct flow of heat from hot-air registers, radiators, or other heating fixtures and appliances.

When using S-726 Stair Tread & Landing Adhesive in remodeling, remove enough of the existing adhesive residue* so that at least 80% of the original substrate of the overall area is exposed.

• Check treads for correct color, shade and amount.
• Allow all materials and adhesives to condition to the room temperature a minimum of
  48 hours before starting the installation.
• The area to receive the Treads should be maintained at a minimum of 65° F
• (18° C) and a maximum of 85° F (29° C) for 48 hours prior to installation, during installation and for 48 hours after completion.
• During the service life of the Tread, the temperature should never fall below 55° F (13° C). The performance of the Tread and the S-726 Stair Tread & Landing Adhesive can be adversely affected below this minimum temperature.
• Do not store outside or on the ground. Do not stack skids or other materials on treads.

Note: Some previously manufactured asphaltic “cutback” adhesives contained asbestos. For removal instructions, refer to the Resilient Floor Covering Institute’s publication Recommended Work Practices for Removal of Resilient Floor Coverings.

PROCEDURE – Non-Porous Substrates

1. Start at the bottom of the stairway, dry fitting the first riser. Leave a gap of 1/16″ on each side for expansion. 
2. Thermoplastic Rubber Nosing must be trimmed to fit and dry laid on each step prior to any adhesive application. Each step in the staircase may be different. Cut all treads 1/16” short on both ends to allow for expansion. Make sure all conditions are met regarding surface preparation before starting the installation.
3. Scuffing back of nosing with 60 grit sandpaper prior to installation is required in all nonporous installations.
4. Spread S-726 Stair Tread & Landing adhesive on tread and nose, using 1/16″ x 1/16″ x1/16″ V-notch 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!
5. Wipe the back of each nosing with a clean dry cloth to remove any debris. Backside of treads must be sanded in all nonporous applications. Not sanding voids warranty.
6. Apply S-727 Stair Tread Epoxy Caulk, using the S-728 Static Mixer Nozzle, 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.
7. 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 S-727 Stair Tread Epoxy Adhesive 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.
8. Thoroughly roll the tread with a 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.
9. Wipe up spills with mineral spirits and clean cloths before any adhesive or compound sets up.

PROCEDURE – Porous Substrates

1. Ensure substrate surface has been prepared properly.
2. Start at the bottom of the stairway, dry fitting the first riser. Leave a gap of 1/16″ on each side for expansion. 
3. Thermoplastic Rubber Nosing must be trimmed to fit and dry laid on each step prior to any adhesive application. Each step in the staircase may be different. Cut all treads 1/16” short on both ends to allow for expansion. Make sure all conditions are met regarding surface preparation before starting the installation
4. Spread S-726 Stair Tread & Landing adhesive on tread and nose, using 1/16″ x 1/16″ x1/16″ V-notch 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.
5. Apply S-727 Stair Tread Epoxy Caulk, using the S-728 Static Mixer Nozzle, 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.
6. Apply enough compound inside the nosing 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” at each side of the nose free of any compound. The S-727 Stair Tread Epoxy Caulk 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.
7. Thoroughly roll the nose flanges with a hand roller, being careful to not roll the edge of the nose where the nose caulk has been applied. Rolling the nose will displace the nose caulk and reduce the compound’s performance.
8. Wipe up spills with mineral spirits and clean cloths before any adhesive or compound sets up.