sweating steel
sweating steel
(OP)
Have steel tubes ceiling/roof joists that are supporting an exterior canopy. On top of the steel tubes, plywood deck is attached. Between the tubes is rigid insulation/blue board. The bottom of the tubes is carsiding for a ceiling finish (carsiding = old railroad car look, a type of 3/4" decking arch'l finish). The roof is a shed roof. Midwest climate. So cool nights and humid days result in sweating of the steel and staining wood supporting beams and carsiding. Any ideas how to help mitigate the sweating? At this time, it would preferable to remove the plywood deck due to the ceiling finish is already installed.
Thank you.
Bob
Thank you.
Bob






RE: sweating steel
In fact, I can still remember my boss diagramming out a similar issue for a project. Showing me a diagram of temperature drop through the roof or wall system and how this led to a dew point right between the insulation and the ceiling material.... resulted in a ton of moisture damage.
I think they ended up specifying some type of more advance moisture barrier. But, I'm not knowledgeable enough to recommend any remediation procedures.
There are companies out there that specialize in this. The ones I know of are:
www.gainc.com
www.abbae.com
You might have some more success consulting with one of them than trying to reinvent the wheel yourself.
RE: sweating steel
You need to vent this.
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com