How to Replace Damaged Roof Shingles

Shingles are the primary armor protecting your home from the elements, and even a single cracked or missing piece can invite moisture into your roof deck. Replacing them is a manageable task, provided you are comfortable with heights and mindful of the delicate nature of asphalt layers. A job well done means a seamless, watertight fit that matches the existing pattern and weather-proofing of your roof. Take your time to understand the shingle overlap. You aren't just replacing a square; you are maintaining a drainage system designed to shed water away from the seams. When you nail in the replacement, seal the heads of your nails to prevent future leaks, and ensure your new shingle is fully integrated with the neighboring courses for maximum protection.

1. Gently Break the Seal. Use a flat pry bar to gently lift the shingles directly above and beside the damaged piece. Break the factory adhesive seal carefully to avoid tearing the surrounding shingles.
2. Extract the Broken Piece. Locate and pull the roofing nails securing the damaged shingle using the pry bar. Slide the damaged piece out from under the overlapping course.
3. Prepare the Bare Deck. Scrape away any old adhesive or leftover roofing cement from the area. Clean the exposed roof deck of any grit or small debris to ensure the new shingle lays flat.
4. Fit the New Shingle Flush. Align the new shingle so it fits squarely into the void. Ensure the top edge is tucked under the upper course just like the original installation.
5. Nail Below the Seam. Nail the shingle in place using galvanized roofing nails. Place nails roughly one inch above the cutouts, hidden under the overlapping layer above.
6. Seal the Bond Permanently. Apply a small dab of roofing cement under the tabs of the new shingle and any lifted surrounding shingles. Press them firmly down to reactivate the adhesive bond.