For outside corners measure from corner to corner.
How to cut gutters straight.
If you have a straight run gable roof measure from shingle to shingle and then add 1 2 inch to each side for a slight overlap.
Extend the cut mark around the aluminum gutter by aligning the blade of the combination square with the length mark you placed on the bottom surface of the aluminum gutter and running the carpenter s pencil along the edge of the combination square blade.
Laying your gutter on the workbench measure off the amount of gutter you want to cut and mark it with a pencil.
Roll the tape down the wall of the gutter pushing it firmly into curves and corners photo 3.
Cut the tape with a scissors or a razor knife photo 2.
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If you have inside corners subtract 5 inches.
Pull the tape measure along the length of metal gutter and mark the length you need to cut the gutter with the carpenter s pencil.
This is our first video in our tutorial on metal roofing.
Use the old adage measure twice and cut once then turn the gutter upside down on the table and mark it all the way around.
Work wrinkles and bubbles flat.
Use a carpenter s square to get around to the bottom.
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Then with the combination square transfer the line down each side of the aluminum gutter.
Tear the paper backing off the tape and lightly adhere one edge of the tape to the top of the gutter.
Measure the total run of the gutter length you need.