Dissimilar metals dont get along well and will corrode through osmosis. Some metals together are okay, others not.

Here's a link that might help:

Here is a link that might be useful: green roofs

Osmosis? Not quite, you may be thinking of electrolysis which is not the correct term either but many people think it is. Galvanic corrosion is the correct term.

Reminds me of a story... NC State was playing basketball in I believe the ACC tournament which was being televised nationally. Charles Shackleford was interviewed after the game and stated something like "I can play with my right hand, I can play with my left hand, I'm amphibious".

Yeah, kinda like electrical....220, 221, whatever!

Thanks for the correction!

Well, thank you sierraeast and mike13, Loved your remarks and helping me out with the correct term. And yes, went to roofing101. Living on the edge of woodsy,land trust land in Connecticut, going with a true "green" vegetation roof would be interesting. Wow, Would need a heavy duty water barrier though. And not sure the construction here (mid-fifties) would hold it up. Haven't seen the weight per square for it in charts like other materials. Ours is looking pretty green now anyway with all the licken on it. Truly like the metal roofs, but even with some barrier for fasteners (copper to steel/aluminum/galalume,if there are any) between gutters and roof,there's the run off from roof into gutters. Read somewhere galalume shouldn't be used near ponds and streams, which we have, a brook and pond,naturally occuring. Ok, still hoping someone with a composite roof will speak up here, how about Tamko Lamarite Slate composite roofs? TIA

I was interested in recycled rubber roofing before we decided to go w/ certainteed grand manors. Heres a link:

Here is a link that might be useful: rubber shingles

Went out roof shopping today. One place handled only Certainteed products, Grand Manor squares at $90. My builder said that's down from when he was using it on Ct. shoreline a couple years ago when it was $200 sq. Then went to a place that handles Tamko products, asked about their laminate/composite product Lamarite. Guys kept laughing, saying they couldn't remember the price it was so stupid. I wanted to laugh too, so asked them to look it up. It's $500 a square here. For that probably could go with real slate, even copper! Who knows? One good thing, you can install yourself without voiding warranty. That's good for people like me who've been remodeling a couple of homes for years now. But for the real bottom line, will probably go with the Certainteed...Grand Manor (or one that weighs slightly less.) Gotta check the live and dead weight specs for my roof rafter situation. Thanks all.

Our grand manors were 185.00/sq. in oct. '06. Glad to see some things have come down! We got semi lucky w/ our copper flashing costs as copper went up again,( after going up), tripling over costs previous years soon after ours was installed. I believe the grand manors are in the area of 425-450 #'s /sq. If you need that info, go to their website:

Here is a link that might be useful: grand manor

bump