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Yes it's for an extension so a valley needs making up to join the new pitched roof to the existing pitched roof. So do you strip the tiles off the existing roof to expose the rafters and fix a layboard onto them first and then fix the new jack rafters onto the layboard?

Hello, just wondering what the method is for forming a valley? Looking on the web I see some have a long valley rafter with jack rafters butting to the sides of it and others have a layboard down one set of common rafters and jack rafters laid on top of the layboard. Is there a specific reason...