Glass mat flashing.
Next, a bedding coat of resin is applied at the cant strips,
then a 9-inch strip of 2-ounce fiberglass mat is pressed into
place (Figure 7).
7. At cant strips, a band of fiberglass mat is pressed
into a bedding coat of resin (top left), then coated with more
resin (top right) and rolled with a small steel roller to force
out any trapped air (above left). Door sills get the same
treatment (above right).
Then, more resin is used to "wet it out," and the whole
thing is rolled with a small (1-inch-diameter) grooved steel
roller to force out any air trapped under the mat. Excess resin
is cleaned off the roller periodically with acetone.
After all of the cant strips are treated, the same process
is repeated at all of the railing post bottoms. Strips of glass
mat are also wrapped over the 1x4 drip edge at the rim joist
8. At the railing posts and perimeter drip edge,
fiberglass mat flashing is bedded flush with the
backcut bottom edge and wrapped up onto the deck
surface, then coated and rolled.
The edge of the mat strip is lined up with the backcut
bottom edge of the drip edge, "wet out" with resin, and rolled
over on top of the deck. Particular care is taken where the
drip edges meet the walls to prevent any voids from developing
that might lead water into the structure. About 100 linear feet
of edging can be flashed in 11/2 hours.