metal over wet shingles? | Ask The Experts Forum

Rob Ormiston can metal go over wet shingles 4/22/2016	My metal roof blew of of a large portion of my barn. It has an old shingle roof and wood furing strips. Can I install the new metal roof over damp shingles and wood strips with getting mold? The ridgecap will have 1 inch foam under the edge to keep water out and the bottom of the roof panel will have foam also. Will it mold? Or any other concerns?. It rained yesterday but has been 80 degrees for the last week, and will rain again tomorrow. I am renting a lift and need to know if it will mold if roofed over ? I really appreciate your expertise. Thanks.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/21150/find/
Todd Miller Isaiah Industries, Inc. 4/22/2016	I would not anticipate any problems with this.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/21151/find/
David Stermer 4/22/2016	Hi Roy, Thanks for your question about metal roofing. The IBC code does not permit roofing over a water-soaked roof covering (section 1510.3). I guess there is some interpretation required for a damp roof. The safe course of action is to wait for the roof to dry before installing metal. Trapped moisture certainly would support mold growth as well as corrosion of the metal roof from the inside. Regards, David	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/21152/find/
Eric Novotny An informed customer is the Best Customer! 4/22/2016	I agree that it drying out is the best course of action. In this case, I am going to guess that as soon as it stopped raining though, that the shingles were basically dry. The shingles should not absorb that much water that they don't dry out in a matter of hours provided there is no rain. You do not want to cover it up like David said, if it is sopping wet.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/21153/find/
Lynn Noesser 4/24/2016	I agree that the area should dry out very quickly. Additionally, if this is a barn with an open space to the lathing on the inside you would have plenty of air circulation from underneath to assist in the drying cycle.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/21154/find/

If you would like to reply to this thread, please log in. If you do not have an Ask the Experts forum user account, create one here.

Find a Contractor

Get Started Today

Take the first step to increasing the value of your home with a great looking, durable, fire resistant and energy efficient metal roof. Browse our list of qualified MRA Member Roofing Contractors in your area for a free consultation and estimate.

Search Now