| Author |
Message |
Paul Sweet (Unregistered Guest)
Unregistered guest
| | Posted on Friday, September 11, 2015 - 01:51 pm: |    |
One of our buildings has a PVDF coated metal roof installed in 1998 that has rust spots where the coating was damaged. The contractor recommends applying a coating (I haven't heard what type)over the roof.
I have always been skeptical of putting anything on a PVDF roof, based on bad experiences with snow guards popping off, and I understand that PVDF is a chemical cousin to Teflon.
I did a forum search, and found a discussion from 2004 saying that PPG Coraflon was successfully used to recoat PVDF coated wall panels. I'm wondering how well it has held up since then, and if anybody has used it, or other coatings, successfully on PVDF coated metal roofs. |
Dave Metzger
Senior Member
Username: davemetzger
Post Number: 603
Registered: 07-2001
| | Posted on Friday, September 11, 2015 - 02:57 pm: | |
There's two issues here. One is re-coating an undamaged PVDF coating. As long as it's properly cleaned, this shouldn't be a problem. Air-dry PVDF systems have been around for years with a good track record. More problematic is the re-painting of the rusted/damaged roof areas. I'd contact the PVDF manufacturer for their recommendations. Depending on how extensive the damaged areas are, may be better off replacing the individual roof panels. Of course then you'd have color and sheen matching issues between the re-painted original panels and the replacement ones. |
Michael Chusid, RA FCSI CCS
Senior Member
Username: michael_chusid
Post Number: 72
Registered: 10-2003
| | Posted on Sunday, September 13, 2015 - 05:16 pm: | |
Regarding adhering snow guards to pvdf:
I checked with Jennifer Morgan at East Coast Lightning Equipment, my co-author of a recent article in Construction Specifier. Many of her lightning protection devices are adhered. She also makes snow guards.
She reports good experience using www.chemlink.com/durasil for adhering to pvdf. Indeed, the silicone adhesive is recommended for that application by the manufacturer. Surface prep, of course, is also important.
Michael Chusid, RA FCSI CCS
www.chusid.com www.buildingproduct.guru |
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