4
Polyset
®
CR-20 can be used to adhere TPO, PVC and KEE Fleece Back membranes to a variety of substrates including: polyisocyanurate (Poly-ISO) insulation boards,
DensDeck
®
and DensDeck Prime
®
, Securock
®
, structural concrete, smooth and granulated modified bitumen roof decks (recover).
POLYSET
®
CR-20
®
ADHESIVE APPLICATION (Fleece Back Membrane)
All surfaces to be bonded must be clean, dry and free of any debris and smooth with no surface contamination. Broken, delaminated, wet or damaged insulation or cover
boards must be removed and replaced prior to application of Polyset CR-20.
Preparation
Polyset CR-20 is a single surface adhesive. It is spray applied in a “Spatter Pattern” onto the roof, insulation or cover board substrate by dispensing the adhesive in a
spray pattern similar to the action required when hand watering a flower bed. The spatter pattern should yield a heavily textured, even coating of approximately ¼” to ½”
nominal thickness height on the peaks of the spattered adhesive.
The seams of the membrane and the factory selvage edge must be protected from overspray of the Polyset CR-20. If overspray does contaminate the seam area,
immediately clean the seam area with seam cleaner or Polysolv while the Polyset CR-20 is still wet. The bonding range of Polyset CR-20 is approximately 1-10 minutes
from start of spraying and will vary according to ambient as well as substrate temperature. The amount of substrate area that the Polyset CR-20 is applied to ahead
of the membrane should be monitored to prevent dry laid membrane. Care must be taken, particularly in high temperature environments (90°F (32°C) and above), to
ensure that the adhesive has not dried or skinned over prior to embedding the membrane.
NOTE:
Membranes can be applied once the adhesive has achieved sufficient bond strength to the immediate substrate to which it is adhered. It is recommended that the
contractor inspect the installed insulation for proper adhesion and re-adhere any boards and/or corners that are not adequately attached.
Product Use
HEAVY SPRAY PATTERN
SUGGESTED SPRAY PATTERN
LIGHT SPRAY PATTERN
CR-20 APPLICATION
