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Tool Talk Discussion Forum

Metal roof cutting again?!!!!

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Bill

01-04-2004 14:02:26




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Was thinking of putting metal on my house, now with the questions. (1)how is the best way to cut the angle up a valley and keep it straight? (2)will the cut edges rust? Thanks.




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Jared in VT

01-04-2004 18:43:55




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 Re: Metal roof cutting again?!!!! in reply to Bill, 01-04-2004 14:02:26  
Bill, For your cut's, build yourself a table and a jig to keep the metal from jumping around, and cut the metal with a saber or circular saw, whatever your comfortable with. Galvinized roofing will eventualy streak and rust stain, but we won't live long enough for the edges to rust away. Before you apply the tin, cover the entire roof deck in "Ice Shield" or whatever "sticky the roof will never leak through this stuff" product is available in your area. Flash and counter flash the heck out of everything. Copper is the best, but it's really a job for the pro's. Most tin roof companies have a complete line of flashing products. If you screw the roofing on, get screws 1/2 inch longer then you think you need. Metal roofing rock's, but ask around your area to get solid recommendations on exactly what you apply, before you buy!

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buck

01-04-2004 16:10:11




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 Re: Metal roof cutting again?!!!! in reply to Bill, 01-04-2004 14:02:26  

Caution here: Metal roofs do not like valleys and should you be in an area where heavy snow, ice build up or very heavy rains are possible then you may be headed for some heavy duty leaks. Metal roofs shed water much faster that asphalt roofs and when hitting the valley will actually run up the adjacent roof. This is particulary troublesome when one roof is flatter than the other. Water will also run uphill on the under side of metal for considerable distance. There is a scientific term for this but escapes me just now. Because of the expansion and contraction of metal calking and fillers are usually not along term solution to leaks. If you feel uneasy working the metal on your roof I would suggest calling a pro with a good reputation. There are many of the old standing seam roofs that were put on 50+ years ago that have many more years of life left in them and then there are the modern barn/commercial roofing being adapted to houses. They are a long way from being the same. Just cautions from my own and others mistakes.

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Scott Green

01-05-2004 14:49:34




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 Re: Re: Metal roof cutting again?!!!! in reply to buck, 01-04-2004 16:10:11  
Buck , I custom bend copper vallies. The trick to not getting water going up the other side is to also bend an "A" shape into the center of the vally. Acts as a breaker wall.



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Fern(Mi)

01-04-2004 17:03:02




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 Re: Re: Metal roof cutting again?!!!! in reply to buck, 01-04-2004 16:10:11  
I think you're looking for osmosis. We've been useing an inverted piece of corner trim flatened a bit into the valley well. The raised lips of the trim edges redirects the problematic adjacent water wash inthe proper direction down. Haven't had any appreciable problems this method.



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Bod

01-04-2004 17:09:01




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 Re: Re: Re: Metal roof cutting again?!!!! in reply to Fern(Mi), 01-04-2004 17:03:02  
That would be CAPILLARY ATTRACTION.



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Bob

01-04-2004 17:10:46




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 Re: Re: Re: Re: Metal roof cutting again?!!!! in reply to Bod, 01-04-2004 17:09:01  
O, my gosh! Don't let the gals see my typo above!
SWMBO will be angry!!!



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buck

01-04-2004 19:43:11




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 Re: Re: Re: Re: Re: Metal roof cutting again?!!!! in reply to Bob, 01-04-2004 17:10:46  

There ain't no way my mind was ever goina head in that direction but I get the point. Or wus that 2 points?



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Fern(Mi)

01-04-2004 17:16:49




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 Re: Re: Re: Re: Re: Metal roof cutting again?!!!! in reply to Bob, 01-04-2004 17:10:46  
This has got to be the learning-est place I have visited since last September. At that time I stopped by the local school with a design math problem. Seen in the office by most of the youngsters I know in my niegborhood. I got more questions than I did answers. A still learning old timer.



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Bob

01-04-2004 14:48:09




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 Re: Metal roof cutting again?!!!! in reply to Bill, 01-04-2004 14:02:26  
LPS makes a spray-can product called cold galvanizing. Use that on the cut edges, or use copper flashing.



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jls

01-04-2004 19:21:45




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 Re: Re: Metal roof cutting again?!!!! in reply to Bob, 01-04-2004 14:48:09  
NO. valley needs to be bent from galv. metal for galv roof----galvanic reaction? some of the silver roofs were a tern? turn? coating not really zink so they didn't react with copper. most of the new painted panels have pre-bent acces. available and the valleys have a ridge bent into them to keep water from rushing from one side up under the other. Also call around and find the place that rolls the stuff themselves, you can order it the right length, 17'4 and 3/4" no lap joint. lay it into the valley, snap a chalk line , lift slightly with a 1X, and use a thin wheel on the angle grinder. very clean cut and the cut won't run off like it can if you cut it on the ground

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