I hate to shingle… but not nearly as much as I hate tear-off.
So today. I see a guy in my town who is installing vertical-seam metal roofing directly on top of his existing asphalt shingle (3-tab) roof.
He says the manufacturer warned him that one day the shingles may telegraph through the metal… but he doesn’t care.
Anybody have any experience with this?
Replies
>>>the shingles may telegraph through the metal... but he doesn't care.
>>>Anybody have any experience with this?
Nope...but if he's willing to do it, then I'd like to watch what happens.....I hate being version 1.0 of anything....
Scott.
Without 1x4 furring the years of heat/cold cycles with differing expansion rates between the metal and sheathing
will wear away the protective coating where the metal meets the shingles and rust will ensue.
30lb. felt between the shingles and metal. No abrasion.
They can't get your Goat if you don't tell them where it is hidden.
They do telegraph, AND as the metal expands/contracts over the rough texture, the granules wear on the backside.
I use strapping to fur the metal off the shingles and create a vented cold roof at the same time. He's just skipping a step.
Another advantage of the furring process is that on an older roof, you can do some shimming to get rid of sages if need be.
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to get rid of sages if need be.
I prefer to keep the sages in case I have questions later. They're usually quite wise and helpful.http://www.quittintime.com/ View Image
where did that letter 'e' come from?
Just 'cause it's the most common letter ion the English language, it thinks it can insert itself into every word?
Sheesh, you'd think it would get tired and stay home sometimes.
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Well now 'o' is butting in too.
I took chemistry once but never read about "letter ion"s.
"I use strapping to fur the metal off the shingles and create a vented cold roof at the same time. He's just skipping a step."
Piffin, by 'strapping' do you mean you use 1x4's or metal hat channel?
BTW: I won't beat the 'sages' dead horse... there but for the grace of God go I!
Thanks!
1x4 or 2x4
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I did it for an old farmer around here once. It has held up fine, no telegraphing.
Voids the warrenty according to manufact. .
Treetalk, I'm looking at a product from Midwest Manufacturing... they actually encourage installation over a single layer of shingles, with fanfold insulation underneath to protect the metal from abrading against the shingles.
They claim it will be much quieter if you don't use perlins...
Lifetime paint warranty (whose lifetime?) is $84/square, 30 year is $63/square... which is certainly competitive with architectural shingle prices lately...
... I don't know, but I'm considering drinking the Kool-Aid!
Lifetime paint warranty (whose lifetime?) is $84/square, 30 year is $63/square...
I'm assuming the lifetime is kynar and the 30 year is polyester.
In real life, the kynar might last 30 years and the polyester often fails in several years.http://www.quittintime.com/ View Image
Mine is Kynar on 26ga and I only got a 20 yr warranteeit's still nice after 13 years tho.
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Mine is Kynar on 26ga and I only got a 20 yr warrantee
it's still nice after 13 years tho.
They've bumped it up to 30 years recently, or at least on the products I use. http://www.quittintime.com/ View Image
No mention in the documentation about 'kynar'...
It's 28 guage: .0142 before painting, .0165 nominal after paint...
... galvanized coating plus zinc phosphate, then primer and paint...
I'm not metallurgist, just a carpenter... sounds like you know your stuff, Seeyou, what do you think?
If I had to do tear-off, I'd probably go with a 120mph-rated architectural... but this certainly intrigues me, and the price is pretty close...
Hmmmmm. If it doesn't say it's Kynar (or Hylar - a different brand name) it's probably not. Must be 2 different grades of polyester. Here's the problems with painted steel metal roofing: There's probably 20-25 (maybe more) painted metal manufacturers in the states. Some of them just sell coil and sheet, some also sell finished roof components.There's probably 200-300 "roof manufacturers" who's operation consists of a metal building with a pan machine and a de-coiler and 3 guys running the operation. They'll run panels until the paint failures start and then they disappear. The prices you quoted make me suspect the latter. You might get a good product, you might not. I'd check out the company a little better and find out what kind of paint they're using. Increasing the thickness doesn't mean doodly if the paint doesn't stay adhered to the metal. What you're looking at may be fine, but they don't seem to be too forthcoming with the truly pertinent info. Good luck.http://www.quittintime.com/ View Image
Most metal roofs - by time you figure waste and trim edging, flashings, and those pesky things that hold it to the roof, add another 25-40/sq
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
I have seen the shingles telegraph through the metal.
I always push for removal of the shingles but if not, 1x4 furring will do.
http://www.amcraftsman.com
todd,
I think I'd opt for a quieter roof w/ 30# felt and fanfold insulation without the sound chamber created by perlins... at the risk of a little telegraphing...
what do you think?
I have no doubt that your method will help dampen the sound if this is a concern.When I push for removal of the roof, it is of the shingles and leaving the sheeting. Then felt paper is still used as well. This also still alleviates quite a bit of the noise, especially compared to purlins only.Todd A. Clippinger~American Craftsman
http://www.amcraftsman.com
Here are some sites that have info about Kynar and Polyester...If you don't catch the exact name on the roofing company's metal that's delivered, then white can be easily switched so you may be paying for a 30yr paint but getting a lower quality 20yr metal... The tax credit for reflective roofing is just for your home/dwelling/residence.
http://www.energystar.gov/index.cfm?c=products.pr_tax_credits#chart
For instance, Kynar's white is known as "Snow White" and the lower and cheaper Polyester grade is sold with one name known as "Polar White". The company below has a notice attached to the Polar White in that there is NO warranty against chalking... That goes for using the correct brand/colored screws, too.
One other issue you may want to explore with your insurance company: No replacement for dents caused by hail unless the weather caused the dents to leak.... Also, here's some good information; maybe it will help if you get that far.
http://www.mbci.com/new/resource_warranties.html
Bill
Edited 6/18/2009 11:13 pm ET by BilljustBill