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Old 03-20-2012, 10:42 AM   #1
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Some basic roofing questions


Couple, hopefully easy questions:

1) Is this copper flashing: http://www.lowes.com/pd_59448-205-85...ing&facetInfo=

About the best flashing material that would make sense to use?

2) Do you cut the flashing into 4 foot sections, then bend it with a sheet metal brake, then just overlap the sections and tar/nail it down?

2.5) *edit* I saw you could get aluminum and galvanized flashing pre-bent at lowes, but not copper. Is copper still the way to go? Trying to get this thing to last till I'm dead - probably 30 years. Would a building supply store be able to get pre-bent copper flashing?

3) Is this the sheet brake I want: http://www.amazon.com/Malco-MB48A-48...2256909&sr=8-2 ?

4) On a low slope roof, is an open valley the way to go? Can you buy real thick copper for the valley?

Sorry if my questions are really basic - just want to make sure I do the valley the best way possible.


Last edited by tibberous; 03-20-2012 at 10:52 AM.
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Old 03-20-2012, 11:42 AM   #2
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Some basic roofing questions


What are you flashing?

That copper from Lowes would not be good for flashing as it is too thin.

If you get sheet copper, you can form it pretty simply with a flat bar and some snips.

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Old 03-20-2012, 02:27 PM   #3
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Some basic roofing questions


Anything the bigbox stores carry is just going to be the cheapest crap out there. If you are looking for quality, shops mfr and ship both stock and custom flashings for what you are looking for, including valley.
Valley copper I prefer 20 oz but 16 oz is plenty acceptable.

Google slate roofing and you should find some suppliers of copper flashings. I don't know where you are so can't direct you anywhere. We fabricate anything but only locally, don't ship anywhere yet. You also may have a local contractor in your area that does the same thing.

Building suppliers are only going to be middle men and that just makes it a bigger hassle and more expensive.
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Old 03-20-2012, 02:54 PM   #4
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Some basic roofing questions


"1) Is this copper flashing: http://www.lowes.com/pd_59448-205-85...ing&facetInfo="
That's less than Heavy Duty Aluminum Foil for wrapping potatos.

You need 20 oz. copper, minimum for valleys.
16 oz. minimum for wall flashing. There is no 'tarring down' involved when installing valleys or step flashing. Wall flashing is never more than 8" long, 4" wide, and 4" tall, though, there are exceptions that only an experienced roofer could make work.
My site in my signature has links to valley work, step flashing, etc. that you can browse.

As mentioned earlier, most any roofing company will make what you need for you.
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Old 03-20-2012, 04:49 PM   #5
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Some basic roofing questions


Here's an example. The valley tops need to be scissor locked so the maximum opening that could be left would be about 1/16". It's usually smaller. A bit of gutter sealer will take care of that.
Step flashing at the ridge gets the same scissor lock treatment.

Also note that you do not nail into the valley metal. You cleat it in place. If done in sections, a nail or two may be used under the 6"-8" lap so the lower section cannot slide down and cause a leak.

Just a few tips you need to know.
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