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CORROSION OF JOIST HANGERS AND ROOF HARDWARE[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: CORROSION OF JOIST HANGERS AND ROOF HARDWARE
- From: Brennan Johnson <BJohnson(--nospam--at)eqe.com>
- Date: Thu, 9 Sep 1999 17:44:52 -0700
I am currently involved in condition assessments of some tilt-up warehouse buildings in Los Angeles that are all about 20 years old. We have noticed in many of the buildings that there is corrosion staining on some of the joist hangers and other roof framing hardware. In some cases the staining is more severe than others; from ground level it does not appear that there is a significant amount of cross section loss due to corrosion. All of the buildings have insulating foil. Our initial thought is that the corrosion is due to the foil trapping moisture from either condensation or roof leaks. We are thinking that if the foil is replaced with a breathable material and the hardware is cleaned, then future corrosion will be slowed and it is thus not a serious problem (I do think that a few localized repairs and replacements will be necessary though). However, we have conflicting reports indicating that it may also be necessary to repaint all of the hardware in order to stop future corrosion. We have seen similar corrosion problems in past projects, but we are still trying to assess the root causes and the effectiveness of remediation measures. It seems like this might be a fairly common issue. Does anybody have experience assessing a similar problem? How serious of a problem is it? If we opt not to paint all of the hardware (just clean it and remove the surrounding foil) will the corrosion (and staining) reappear? Will painting (with a coating such as Rust-Oleum) stop all future corrosion? All input would be greatly appreciated. Further, does anyone know of a "corrosion engineer" that may have experience in this area, and be able to give some specific technical data? Thank you. Brennan Johnson EQE International Irvine, CA
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