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9 Best Of What Should I Put Under A Metal Roof Best Wallpaper JPG. Avoids nails or screws which could penetrate the metal roof and cause leaks. Jan 28 2019 The metal will be attached to at least 34 purlin and 12 plywood instead of just 12 plywood which should make the overall roofing system stronger.
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Cross purlin designs with 16 OC are sometimes called for. For most roofing projects two types of underlayment are. If you put the 2x4s on end you should get a 3.
Underlayment must also act as a secondary weather barrier in case the roof fails.
But there are parts of the home that differ. Traditionally built homes will need an underlayment. Jan 24 2019 2 Install Underlayment Right over the Shingles before Installing the Metal Roof The second way to install a metal roof over a shingle roof is by applying an approved underlayment right over the old shingle roof. Of ply or OSB.
