How to install metal roofing over shingles video with success
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This is more expensive but will also be higher quality. Purlins can be used to provide space between the old roofing and the new metal roofing panels. For starters, the new underlayment will be a secondline of defense should any water somehow get under the metal roof.
Next, use 1 ¼ inch nails.
And secondly, it would be a buffer between the shingles and the new metal roof. Next, use 1 ¼ inch nails. Leave the old valley flashing in place, and install new over it. The furring strips are 1x4 pine boards.