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Posted by marson on August 4, 2006, 10:19 pm
John Ross wrote:
> I am confused as to the terms "sheet metal jacks" and "collars" used in
> roofing flashing for vent pipes.
>
> Can these be one unit?
>
> Here's what I see: What looks like a "cone" attaced to the bottom of
> flat flashing. So this piece is put over vent pipe and thus you have a
> metal "bottom" and a "cone" that comes up a little ways on the pipe,
> then the rest of the pipe protruding upwards.
>
> So is the bottom part the "jack" and the "cone" the collar? What
> confuses me is it looks preassembled to be one unit, but are the two
> "parts" labeled differently or does this one unit have a name? Or are
> these interchangeable terms?
>
> Thanks. And before making fun of my newbieness, at least I didn't ask
> what a vent cap was! :)
these terms vary a lot in different areas, i think. i would call the
sheet metal jack the flat piece with the cone shaped flashing. the
flat piece attaches to the roof (and is tucked under the shingles) and
the cone shaped piece goes around the pipe. the only collar i know of
is a "storm collar" which attaches to the pipe above the flashing.
(used on metal chimneys). this is caulked to the pipe, and prevent
water from going down the pipe. you can't caulk the flashing directly
because movement would break it.
> --
>
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