NSS SAFETY STAIR TREADS INSTALLATION INSTRUCTIONS
PREPARATION OF STAIRS:
- All stairs must be sound, clean and level prior to installation.
- An application of leveling compound should be made over dished or worn stairs to provide a level-bearing surface for the safety stair treads.
- Smooth steps such as marble, terrazzo, tile, metal, etc. should be roughed up to insure good adhesion. Always vacuum steps clean to remove any loose particles.
- Other types of stair surfaces need to be thoroughly cleaned.
- Trowel a leveling compound against a straight-edge board held to the front of each step to provide a square edge.
- Begin at top of stairs and work downward. Leave until cured. (See manufacturer’s instructions).
CONCRETE and MASONRY STAIRS: NSS recommends using ¼” x 1¾” 410 Stainless Steel Phillips Flat Head Concrete Anchors. Drill pilot holes with a hammer drill fitted with a 3/16″ masonry bit, ½” deeper than the anchor itself.
STEEL STAIRS: NSS recommends using a hardened steel ¼” x 1″ Phillips Flat Head Self-tapping Floor Screw. Pilot hole is 13/64″. If you find the self- tapping screws are very hard to drive in, you may use a larger drill bit (7/32″) for your pilot holes, but be careful not to strip treads.
WOOD STAIRS: NSS recommends a ¼” x 1 ¼” Stainless Steel Wood Screw. Drill pilot holes with a 3/16″ drill, at least the depth of the anchor.
Shop vacuum, caulk gun, extension cord, drill, drill bits and screwdriver. For masonry installations: shop vacuum, caulk gun, extension cord, hammer drill, 3/16” masonry bits and screwdriver.
STAIR TREAD INSTALLATION INSTRUCTIONS:
(A) Block off access to the stairway you will be working on to keep people out of the area. Put up signs and danger tape;
(B) Begin at bottom stair. Carefully lay stair tread upside down on the stair;
(C) Apply a ¼” bead of glue all the way around the perimeter of the bottom side of the tread, keeping approximately ¾” away from the outside edge of tread. Apply an additional ¼” bead in a wavy pattern on the remainder of the bottom side of the tread inside the perimeter bead, as well as a ¼” bead around each predrilled hole approximately ½” from the hole. For exterior installations, substitute clear GE Silicone caulk instead of glue;
(D) Carefully pick up, turn over and place tread on stair;
(E) Push down on tread to distribute glue or caulk;
(F) Be sure ends of tread are equally spaced on stair and that tread is pushed back as far as it will go against front edge;
(G) Using a shop vacuum, hold end of vacuum hose as close as possible to the predrilled hole(s) in the tread in order to vacuum up dust and drillings from hole and tread;
(H) Carefully drill the first hole toward the center of the tread;
(I) Vacuum out all dust and debris from hole;
(J) Screw in and tighten anchor. CAUTION: Using a power driver can strip the fastener. If you use a power driver, use the clutch to help prevent stripping;
(K) Drill and anchor another hole on either end of the tread;
(L) Drill all remaining holes and anchor them;
(M) Repeat the process for remaining stair treads.