My roof was gone over about ten years ago. The roofer install new
roof vent flashings. There are four of them. Ten years later all
rubber part of the flashing cracked and deteriorated. I believe the
old ones the roofer removed were good and has lasted about 25 years.
They don't make things like they used to?
I went to Home Depot the other day. Bought four replacement roof vent
flashings. They were from the same manufacturer, Oatley. Rather than
replacing the flashing assembly. I cut away the deteriorated rubber
leaving a rubber ring where the edge was clamped to the aluminum base
intact. Then I pried away the aluminum at the base of the rubber on
the new flashing assembly. Slipped them on to the vent pipe and
snuggly fitted the rubber cap onto the old one and caulked around the
edges with roof sealant.
I know it will last only ten more years. Is there anything I can do
to prolong the life?
Supposition would be one of two things--either the originals were a
different material or perhaps EPA has had an effect on rubber products
similar to paint, etc., that restrictions on outgassing and/or
manufacturing processes makes them more susceptible to uv than previously.
I'd guess only thing that might help would be a good uv protectant--this
stuff is supposed to be good; there are others as well, of course --
Make a small storm flashing collar (like you would use on a type "B" chimney
over the regular flashing) out of tin or aluminum, and clamp it on a couple
inches higher than the rubber. This will eliminate exposure to direct
sunlight and also reduce some of the heat on that black rubber heat sink. I
can't draw the thing here, but imagine a japcap with a hole the size of the
pipe drilled in the center of the top, and then slipped down to your
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