Hi Amy,
Thanks for your interest in metal roofing.
I believe it is a good practice to install a roof over a dry assembly.
The IBC specifically prohibits reroofing over a water soaked roof or roof covering in section 1510.3.1.
Regards,
David
David Stermer
2017-09-14 08:33:35.000000
Is it going to create a problem or some kind of mold hazard by installing a metal roof on a wet or damp roof after it has been raining all night but has stopped on the day of installation and it will be cloudy all day?
Amy Fortner
2017-09-14 08:23:49.000000
What type of underlayment are you running? The reality is that even with cloud cover, synthetic underlayment will dry as long as there isn't falling rain.
I would not install over wet felt though. Never a good idea.