DIY Installation steps for Pro Gutter Guard on corrugated roofing Step 1. Fix mesh to the gutter with a screw and roll out for 1.5 metres Step 2. Remove the screw and fix the first trim to the gutter with self-drilling screws. Step 3. Roll mesh out for up to 5 metres and continue to fix trims along gutter edge. Step 4. Fix saddles on every 2nd rise using self-drilling screws.