Before You Begin
Thoroughly clean the gutters before installing gutter screens. Wear heavy gloves and standing securely on a ladder, scoop out the debris that has settled in them. Either put the debris into a bucket or toss it on the ground below to clean up later. If you use a bucket, empty it into a waste container every time you have to climb down from the ladder to move it around the perimeter of the house. Then use a garden hose to flush out the gutters when all of them are clean.
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Step 1 : Test fit the screen and clips
Insert clips into the slots in the screen using three of them for every 4-foot section of screen.
Step 2 : Install a screen
Slide the screens up under the shingles. Pull them down onto the edges of the gutter.
The clips holds it firmly in place. You can butt them together or overlap and fasten them together with # 12 sheet metal screws.
Step 3 : Cut to fit
To trim a screen to fit use a tin snips or heavy scissors.