metal roof install help?

[Garagebound1]

What is used over plywood under metal roofing? I've been told a rubber film over plywood. I've also been told that this causes the screws to rust off.

 

[JBourquin]

Some people use roofing felt but I don't think it's required.

 

[chamoisfive]

Roofing felt. Always put roofing felt or an underlay beneath roofing iron. Helps reduce deterioration of your timber in the long term from the inevitable condensation that forms under the iron. Unless of course you are in an open front shed/barn situation

 

[brownbagg]

tar paper

 

[Justanoldguy]

tar paper

that

 

[rburke65]

What does the manufactuer recommend and require to maintain the warrantee? That is THE place you should be getting your info from. Mine was built with the synthetic underlayment.

 

[ADSR]

synthetic roofing underlayment

Tar paper/felt is junk.

http://www.interwrap.com/RHINOROOF/index.html

 

[Justanoldguy]

Tar paper/felt is junk.

Comes down to Quality not TYPE.
Been using Tar paper for 45 years.
No-one has complained ..

 

[Steve in Mi]

Rhino (in the link above) isn't even advertised for use under metal roofing, WHICH is what the original poster asked about.

 

[jeffhayden]

It just helps to save from deterioration. That is good for your metal roof.

 

[ADSR]

The problem with paper and metal is, the paper bunches up and can be seen through the thin gauge metal 24g.

 

[bob15]

Tar paper and purlins over that. Or as I did it, purlins over the 3 tab shingles......quick and easy.

Also, if using screws, make sure you follow the manufactures installation directions. Most have screws in the valleys unlike the old days of nails on the peaks.....except when joining two pieces of roofing, then you use a shorter screw just to screw the panels together.