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We have just purchased an A Frame (no attic) lake cabin in Iowa. It currently has cedar shakes that are about 25 years old and covered with moss and possibly mildew. The area is wooded and mostly shaded. It has been suggested that we can put a vertical metal roof over the shakes, with horizonal 2x4 stripping to screw it into. They have also suggested 1.5 dense foam insulation between the stripping for additional insulation. Our question is if the moss and mildew will be a problem underneath the new metal roof, or any other potential issues. We would prefer not to remove the roof if possible. Thank you for your advise. Gordon
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Chances are that the a-frame construction has little or probably no ventilation. The cedar shakes, by their nature, have breathed a fair amount.
Unless there is a strong vapor barrier in place on the inside of the roof someplace, I am concerned that moisture and condensation problems will result.
Also, if just horizontal lathes are in place, you will end up with a very uneven surface.
If the shakes are left in place, there are some metal shake and tile profiles designed for application over shakes. Another option is to use vertical lathe over the shakes, followed by horizontal lathe or decking, creating an eave to ridge vented airspace.
I strongly suggest using this website to locate some manufacturers of quality metal roofing in style you like and then contacting those manufacturers to work out details of how they feel their roof should be installed on your home.
All I can give you is here is generalities. You need to speak more in depth with the manufacturers of the products you might specify.
12/27/2003
Or copy this URL: https://www.metalroofing.com/spirit/comment/2547/find/12/28/2003
Or copy this URL: https://www.metalroofing.com/spirit/comment/2548/find/