Rolling can produce a maximum bend of 360 degrees in most forms of metal.
Bending metal siding.
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Use a rolling technique to bend sheets of metal roofing.
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Your tapping should start at one end of the evolving bend.
Lay a piece of scrap wood on top of the metal and clamp the scrap lumber the metal and the bottom hinged board to the work surface.
Bend the metal with your mallet.
To prevent damage or unsightly dents it s best to use a rubber plastic or rawhide mallet to gently tap the metal.
Do this until it bends toward the form block and achieves your desired angle gradually and evenly.
Use a saw or snips to cut the coiled siding to length.
Rolling utilizes a die which is sized according to the desired radius of the metal sheet.