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The contractor of my metal roof overlaid the ribbed metal roof directly on top of my old roof, which was the old asbestos slate tiles. I had heard that it is safe to contain the asbestos rather than removing it. I am so unhappy with the installation. It was full of waves and dimples beneath the screws. The city inspector said that it was not installed according to city code. My question, can the metal roof be taken off and firring strips be put on top of the old tiles and then the roof put back on? I know that the old tiles are broken already, small pieces keep sliding out, and it has been 2 months. What would this look like? Would the asbestos tiles sliding out be a safety concern? Or does the old tiles need to be removed and new metal roofing materials used? Another concern is the use of flashing versus caulking, around the chimneys and wherever the metal meets the opposing house siding. My contractor felt that metal flashing was basically not needed. I question that position. One last question. The heat causes the metal to expand and contract. The dimples go up and down from the heat. Will this action loosen the screws and pose future leaking problems?
I appreciate your help.
Joyce
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Hi Joyce,
Sorry to hear about this.
Generally, encapsulization of asbestos roofing is better than removal and disposal. However, the ability to install over old asbestos roofing requires that several factors be met and it sounds like your roof has not done this.
My guess is that the asbestos is broken up enough at this point that, if the metal panels are removed, the asbestos will need to be removed as well. Thenm whatever is beneath that will have to be properly prepared for re-installation of the metal.
Some of the metal panels will be re-usable. It may be tough to re-use cut panels or panels with sealant on them.
In my opinion, metal roofing should always be flashed with metal. Yes, sealants are used as well but as back-up, not primary, protection.
Could expansion and contraction cause the screws to loosen? Possibly. I am assuming your roof is a through-fastened metal panel. How likely the screws are to loosen depends a lot upon the condition of the lumber they are fastened to.
I hope this helps.
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Todd,
As a homeowner who has an older, asbestos tile roof (I am considering covering it with a metal roof) I was disturbed to read this posting. When it comes to using metal roofing to cover an asbestos-tile roof, what are your experiences? What would you suggest?
BRgds,
Ben
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My experiences with installation over asbestos have consisted of shake-sty;e metal products being installed. The modular shake-style panels are forgiving in that the interlocks between the panels help to allow for any differences in height of the old roof. Additionally, the panels I have worked with all have concealed fastenrs.
In regards to asbestos, I have found that some becomes very brittle as it ages and some not so brittle. I suggest using a self-tapping self-drilling stainless screw for attaching the metal panels. I suggest doing a few test fasteners before deciding to do the complete installation. If the asbestos cracks badly when you drive the fasteners in, then I would probably resort to removing the asbestos.
Certainly, though, encapsulizing the asbestos is overall a good idea and is supported by the EPA. However, you should contact any local building officials prior to proceeding so you can make sure they are okay with it.
I have seen lots and lots of installs over asbestos and never have I later regretted going over the asbestos, as long as it was confirmed that it wasn't horribly brittle and as long as the roof was installed properly.
I also suggestinstalling the underlayment sort of as you go when you install the new roof, in order to minimize the number of fasteners required by the underlayment.
Most asbestos shingles overhang on the eaves and often the gables. These either need to be cut back flush with the fascia boards or you will need some special flashings made to cover them.
I hope this helps.
All Best.
6/16/2004
6/17/2004
8/14/2004
8/14/2004