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Of course, I do not know any history of this roof but, unfortunately, if peeling is the problem, there is little you can do shy of stripping off all of the old paint, cleaning the metal well, applying a quality primer, and a quality top coat.
If this roof was purchased from a quality manufacturer originally, there is likely some warranty coverage on it. You should look into that.
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I've read comments on this subject in your panel before , and you mention stripping or cleaning w/pressure washer , and applying a quality primer and top coat. I have a 5yr old home that had metal roofing installed when constructed. We are purchasing the home now (thru a fore-closure) and have tried to find out the roof manufacturer , only in vain. Haven't been able to locate the original owner(who happens to be the person who installed the roof). I even tried to take up a couple panels on the garage to see if a manufacturer name might be on the under side. Couldn't see any. Well I did study the panels as they are , and where the flakes of paint are coming off, there is nothing attached to the bottom side of the paint flakes, just the green paint peeling up. And underneath where the paint flakes up , it appears to be a galvanized look/finish. No other coating/primer etc. Now I tried to scrape this , and it appears to scrape on down to just a plain bare metal, with no galvanized look. Is that normal ?? should there be another primer coat there?? This is a fairly large gable roof, and there are a few complete panels that aren't flaking at all. I tried to scrape thru the paint on these , and it was very difficult. Seemed to be in very good shape. Hard to tell when scraping if there is a definate primer coat under this paint ,(any different than where the paint is flaking. The individual who built this house (and lived in it) was actually in business installing metal roofing, and did a very good job with the whole house going to extremes to go over and above what you would normally do on the whole house , so I find it hard to believe that he would have cut corners on the quality of metal he put on his own house. Maybe it just wasn't treated properly??? Anyway (sorry for the book) Just would like to confirm (if I'm unable to find the manufacturer/brand for warranty) if you feel that this could be cleaned/pressure washed , and whether the right primer and top coat would stick and hold , and LAST. And if so will it be more costly than replacing. I'm not worried about the time involved or how hard it will be , I'll get a little help and do it myself. I just don't want to waste my time for 1-2 yrs of longivity.It's a $200,000.00 home, so I want to fix it right. But don't have money to burn either , so if repair vs. replace is cost effective thats what I want to do.(really don't want to tear it off if I can keep from it. Appears it was all installed well and still in good shape after five years (with the exception of the flaking paint). I really appreciate your time and comments.
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Joe,
The higher quality paint systems have primers but some of the lower cost systems do not.
Primer is sometimes hard to see -- it is typically a transluscent yellowish color and, especially on the back side of green paint, it could be hard to see. (Chances are the adhesion problem is between the primer and the metal itself or, if there is no primer, between the exposed coat and the metal. An adhesion problem between primer and top coat is very unusual.)
There are numerous reason why adhesion problems could occur. Perhaps the pre-treat on the metal was missed or perhaps the primer was missed. There could also be quality problems with the primer. Or maybe the metal wasn't cleaned properly. Lots of possibilities and it would require miscroscopic exam by an expert to determine the cause.
I have a gut feeling that, unless you could get all of the "bad" paint off, down to the bare metal, a repainting job is not going to be successful for more than a very few years.
If you get a chance, email me a picture of the roof as wella s your location. I might be able to help identify its manufacturer. Also, let me know the previous owner's name. You really need to track down the manufacturer as this should be a warranty claim, unless the previous owner started with unpainted metal roofing and painted it himself.
Todd Miller
[email protected]
8/6/2004
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Or copy this URL: https://www.metalroofing.com/spirit/comment/3647/find/Isaiah Industries, Inc.
8/6/2004
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