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Can I save money by installing metal roof over existing cedar shakes that are "double overlapped"? 1x6 boards exist under shakes separated by 4" gaps. Roof is classic barn shape (shallow-steep-shallow) with 3 dormers per side covering 30x50 footprint. Or should shakes be removed and can metal be installed directly to existing boards without expense of plywood sheeting?
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If the shakes are removed, you would need to either put down plywood or fill in the gaps of the current lathe with wood.
However, there are several shake and tile profile metal roofs which could likely be installed over the shakes. Contact some manufacturers through this site and make inquiries with them, sending photos if you wish.
There is also a possibility of applying vertical and then horizontal battens over the shakes, creating a ventable air chamber, and then installing a metal roof over that.
As always, I caution readers to not assume that my recommendations to Wedge will work for all applications. Write in and ask about your situation!
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If I apply metal roof over cedar shakes, do I need to apply horizontal strips every 2 feet to screw the metal to? Or can I just screw metal to shakes? If horizontal strips should be applied, are there any materials that work better than others? Any special "firring" type strip materials that could be recommended?
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This question must be answered based upon the exact product you have chosen to install. Another factor is the thickness of the existing shakes.
There are shake and tile profile metal systems which likely could be installed over your shakes.
With most vertical seam products, at the very least, battens will need to be installed, first vertically and then horizontally. However, with some products you would actually install vertical battens followed by solid decking.
For the battens, do not use treated lumber as the chemicals in it could react badly with the metal.
Spacing of battens will be dictated by the product you're installing and how it has been engineered and tested.
4/14/2005
Or copy this URL: https://www.metalroofing.com/spirit/comment/5720/find/Isaiah Industries, Inc.
4/14/2005
Or copy this URL: https://www.metalroofing.com/spirit/comment/5721/find/6/14/2005
Or copy this URL: https://www.metalroofing.com/spirit/comment/5722/find/Isaiah Industries, Inc.
6/14/2005
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