| http://www.w3.org/ns/prov#value | - I have a good book on the subject (Amazon.com: The Slate Roof Bible: Understanding, Installing and Restoring the World's Finest Roof (The Slate Roof Bible, 2nd Edition) (9780964425811): Joseph Jenkins: Books It states the proper underlayment is green, rough-sawn, local hardwood, commenting that plywood is the biggest mistake made buy rookies installing slate roofs.
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