Some gutter guards need to be installed under your roof shingles. The types that do are more challenging to install, and doing it yourself could lead to you inadvertently voiding your roof warranty or damaging your roof.
We suggest getting a gutter guard system that is suitable for DIY installation — like the Gutterglove or the Amerimax Home Products Micro Mesh Guard — or hiring a professional to complete the installation for you if the product needs to be installed under the shingles.