How to install tin roofing over shingles with pictures
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Use notching scissors to notch the metal in the middle so that it will bend over the ridge. To ensure that the roofing materials fit in place perfectly, you should ensure that you install slat boards over shingles. For ideal results you should ensure that the boards are 24″ apart.
The second way is to install 1×4 purlins over the shingles.
The metal roofing is then secured to these slats of wood on the roof. On flat, even roofs, you can place the metal roofing directly on top. Step by step metal roof installation. Snap lines on either side and install the caps.