Installation Instructions

Which Armstrong ceiling products can be glue-applied?
A: 741 Fine Fissured (12" x 12" x 1/2") and 746 Fine Fissured (12" x 12" x 5/8")
Installation tips:
1. If you prefer to use adhesive, follow directions on the adhesive packaging.
2. As the tile is pressed to the ceiling, the adhesive will spread and cover an area of
approximately 3" across and 1/8" to 3/16" thick. Acoustical tile adhesive is
recommended. An example of such an adhesive is Henry #237 Acousti-Gum.
3. Do not "butter" too many tiles in advance, as a skin will form on the adhesive dabs
and weaken the bond.
4. Level tile by inserting a 1/16" thick fiber spline approximately 3" long at each corner
(works out to one spline for every tile.)
5. Use a 48" to 72" straight edge and press to the face of the installed tile to help level
the ceiling.
6. If a trim is needed at the perimeter, use one of the Armstrong Slip-on Wall Moldings.
These moldings are 10’ long, have a 15/16" flange and are available in thicknesses of
½" (#7841), 5/8" (#7842), and ¾" (#7843).
Special Note: Do not bend tile during installation. The "spring load" will cause the
adhesive to release. Avoid working with warped tile, as the same problem will occur. On
surfaces that were previously tiled, do not place new adhesive on top of old adhesive.
For additional information on glue-up applications for acoustical ceiling tile, we
recommend referencing the CISCA Ceiling System Handbook; this has a complete
chapter on this procedure.