TOPIC: I Have An Existing Metal Roof and Have A Question
Return to I Have An Existing Metal Roof and Have A Question
Return to Forum
The current metal roof is almost 50 years old and needs replaced. I'm replacing with a new metal roof in an unheated equipment barn. What is the best method to eliminate condensation from forming.
Have you had condensation issues in the past? Sounds like the roof lasted a pretty good long time.
yes I have had condensation issues. the roof should have been replaced 15 years ago, but never got to it. Some of the perlins need replaced because they have rotted from the moisture. I was looking at the inexpensive method of bubble insulation, but not sure how effective it is.
So, your current structure is rafters, horizontal purlins, and sheets of metal roofing? Is that correct? No animal confinement, correct?
Keeping the air moving with fans or something could be helpful. So could adding actual intake and exhaust vents. I am concerned that the bubble insulation, while it may work, may just transfer the problem from the underside of the metal to the underside of the insulation. I'd suggest talking to the manufacturer to see what they think. Closed cell urethane foam is an expensive option. Adding decking might take care of the issue, and definitely would if you put purlins on top of the decking. There are also products like DripStop that can be applied to the underside of the roofing, to absorb the moisture and then release it slowly rather than let it drip. http://dripstop.net
the drip stop looks good, but I have already purchased the metal. did not look like there was an option to apply it on the metal. If I'm going to spend the money to deck the roof I'll just shingle it and use the metal to replace the vertical sides.
If you would like to reply to this thread, please
If you do not have an Ask the Experts forum user account,