For my GH restoration project, in which I have put twinwall
polycarbonate in an existing aluminum frame, I installed a flexible
ready-made cap from Lowe's by screwing it in three overlapping sections
to the aluminum cross-pieces, and, though functional, it looks like the
devil: uneven and ugly.
Sundance Supply offers two other options:
1. 15 mil Butyl Adhesive Roll Roof Flashing Tape from Carlisle
Hardcast; I would want the 6 inch width with shiny aluminum foil
backing. Sundance Supply says this will work at polycarbonate roof
valleys, but I don't see why it wouldn't work at the ridge as well.
2. Go to a local sheet metal shop and have a cap made from aluminum
(.019" minimum) or steel (30 gauge). Sundance says aluminum is easy to
fasten and cut but flimsy. Steel is sturdy, harder to cut, and requires
pre-drilling prior to fastening.
I would appreciate opinions as to how to cap this ridge. Thanks.
No, cannot be vented at top. Polycarbonate sheets already in place.
Just need to put some kind of cap, in shape of inverted V, where
sheets more or less come together at the ridge. I will explore plastic
guttering suggestion but think Sundance suggestion (have local sheet
metal shop make cap of steel or aluminum) will probably serve. Thanks
Note that I have twinwall polycarbonate roofing as well. I went to a local
sheet metal shop that specializes in gutters and flashing, and bought a
length of copper flashing (approximately 20'). I had them bend an oblique
angle in it and carefully got it home without crimping it badly. I then used
the same gasketed screws that you use when fastening the polycarb to the
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