Re-Roofing an old barn - Shingles to Steel

Hello I am looking for some advice, I am in the process of re-roofing my barn (60 -70 year old barn). It has/had 3 in 1 shingles with felt paper and tounge & grove boards. I am thinking about leaving the tounge and grove boards and running perlins over the top of them to take out the "small waves" that have formed within the roof over the last 30 years. Would I need felt paper under the perlins? Thanks Shane		Guest User 8/19/2013	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/18705/find/
Shane, I would suggest some sort of underlayment such as 30 pound felt paper ... or a synthetic underlayment.		Todd Miller Isaiah Industries, Inc. 8/21/2013	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/18706/find/
Yes. You will need some sort of underlayment behind the purlins. Personally, I prefer the synthetics that Todd mentioned.		Eric Novotny An informed customer is the Best Customer! 8/21/2013	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/18707/find/

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