I never came across using aluminum foil tape as flashing. I have used
it for ducts, for hot exaust pipes, and other uses. Flexible sticky flashing
is now usually done with mineral based sheeting with polyethelene
backing. Most auto parts stores sell metal tape. I used some stainless
tape for covering chrome or chrome like parts. I just recently came across
the cloth tape with mild stick, or gaffers tape. New to me. There are
different backings for duck tape. I like using the remants of the not
available anymore, 100 MPH tape from Sprotsman Guide, orginally used
to repair aircraft wings. It has a stretch unlike most, and really
holds up and sticks well.
An aluminum metal tape is also used to seal the seams between the
metal-backed foam insulation on homes. The adhesive is permanent, and
the tape is pretty expensive as such things go, but it keeps out the
wind (and water) well.
I wonder on what sort of construction?
In the UK where buildings pretty well all have stone walls, the lead
flashing is bent into a 'chase' created in the masonry, usually the mortar
between coarses, secured with lead wedges and mortar applied afterwards to
seal. A lime based mortar is best to accommodate some movement. Down the
edge of a roof where it meets the brickwork it will be cut into a step
shape to follow the line of the horizontal bricks. And it's still very
much in use today - despite the cost.
*Why is the man who invests all your money called a broker?
Dave Plowman firstname.lastname@example.org London SW
If ducts are made properly, they should be locked together by a folded
seam by which the ends of the ducts slide together and an edge is then
folded over to lock it all together.
Look up "pittsburgh seam" or "pittsburgh seaming" and "ducting" on Google.
Metal duct is pretty rare in the south. They use fiberglass "duct
board" that gets taped together with metal backed tape.
When A/C is you main use, ducts are in the attic and humiidity is 90+
metal will sweat like a pig.
Garden variety duct tape won't last a year.
It is simply because the crap they sell at Wal-Mart is not GI grade
(AKA 100 MPH duct tape). I had some I used on dive gear that held up
for many years and regularly used under water.
You can still buy it at some military type stores but it costs over
$10 a roll.
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