Specification
Self-Adhered Flashings
The Corrosion Problem
• CCA treated wood, used for almost 70 years,
is no longer available for residential usage
due to its negative environmental and health
eects.
• Environmentally safe but significantly more
corrosive preservatives (ACQ, CA-B, ACZA)
replaced CCA as of January 1, 2004.
• New wood treatments are approximately 2.5
– 4 times more corrosive to galvanized metal
components compared to the historically used
CCA.
• Corrosion may become visible in a short
period of time – weeks or months rather than
years. Wet conditions accelerate the corrosion
rate.
• Heavier galvanized coatings (G185 or batch
hot-dip galvanized) extend the life of the
connectors and fasteners, however the
corrosion mechanism and rate do not change.
The use of additional protection is highly
recommended.
How Does GCP Vycor Deck Protector Work?
GCP Vycor Deck Protector is the first uniquely formulated solution to help reduce corrosion of
galvanized metal connectors. It is installed between the connector and the pressure-treated wood
and acts as a barrier layer to break the electric circuit and thus helps reduce corrosion.
GCP Vycor Deck Protector also helps reduce the corrosion rate of galvanized nails that attach the
connectors to the treated wood, by separating them from the corrosion influence of the large
connector (i.e. joist hanger). The corrosion rates of these fasteners may not be at the level seen with
CCA wood.
Use hot-dip galvanized (HDG) fasteners per ASTM A153 when attaching galvanized metal
connectors. HDG fasteners optimize structural and corrosion performance in these applications.
Use fasteners per the manufacturer’s recommendation when attaching the surface decking boards
to the supporting joists.
Galvanized joist hanger attached to ACQ
wood, 7 months; wet conditions.
Corrosion
Fastener
The worst corrosion
point – fastener at
the wood interface
Joint Hanger
New Pressure-Treated
Joist