How to Replace Damaged Shingles
How to Replace Damaged Shingles
Replacing a few damaged or missing asphalt shingles is the most common DIY roofing repair and one of the easiest to learn. Whether wind ripped a shingle loose or hail cracked one, a quick replacement prevents water from reaching the roof deck and causing far more expensive damage. This guide walks you through the full process, from assessing the damage to sealing the finished repair.
Estimated time: 30-60 minutes per shingle
Estimated cost: $10-$30 DIY vs $150-$400 professional
What You'll Need
Tools
- Flat pry bar or roofing shovel
- Hammer
- Utility knife with fresh blade
- Caulk gun
- Tape measure
- Safety harness and roof-rated footwear (see Roof Safety Guide for Homeowners)
Materials
- Replacement shingles (matching brand, style, and color)
- Roofing nails (1-1/4 inch galvanized for standard shingle thickness)
- Roofing sealant/cement
- Scrap plywood or board to kneel on (distributes weight, protects surrounding shingles)
Before You Begin
Match Your Shingles
Shingles fade over time, so an exact color match can be difficult. If you kept leftover shingles from the original installation, use those. Otherwise, note the manufacturer name, product line, and color printed on the wrapper or visible on the shingle back. Bring a damaged piece to the supply store for comparison. A slight mismatch is normal and will blend over a few months of UV exposure.
Choose the Right Weather
Work on a calm, dry day when the temperature is between 60°F and 80°F (15-27°C). In this range, shingles are flexible enough to bend without cracking but firm enough to handle without tearing. Cold shingles snap; hot shingles smear and scuff underfoot.
Step-by-Step Instructions
Step 1: Assess the Damage
From the ground or using binoculars, locate every damaged shingle. Look for cracks, curling, missing tabs, or exposed nail heads. Mark each spot so you do not miss any once you are on the roof. Check the decking underneath for soft spots or water stains -- if the deck is rotted, the repair is beyond a simple shingle swap. Review Signs of Roof Damage After a Storm and How to Inspect Your Roof for a thorough assessment method.
Step 2: Prepare for Safety
Set up your ladder on firm, level ground following the 4:1 rule (one foot of base distance for every four feet of height). Wear rubber-soled shoes and use a safety harness tied to a secure anchor point. Keep all tools in a pouch or bucket so nothing slides off the roof. Have a helper on the ground. Full safety procedures are covered in the Roof Safety Guide for Homeowners.
Step 3: Break the Sealant Bond Above the Damaged Shingle
Each shingle is sealed to the one below it by a strip of adhesive. Carefully lift the shingle two rows above the damaged one. Slide the flat pry bar under the tabs of the shingle one row above the damaged one and gently break the sealant bond. Work slowly to avoid tearing good shingles.
Step 4: Remove Nails Holding the Damaged Shingle
With the upper shingles lifted, you will see two rows of nails that pass through the damaged shingle:
- Top nails: Located in the shingle one course above, driven through the top edge of the damaged shingle.
- Self nails: Driven through the nail strip of the damaged shingle itself.
Slide the pry bar under each nail head and lever it out. A standard 3-tab shingle has four nails in its own nail line plus is pinned by the four nails in the course above, for a total of eight nails to remove. Remove all of them.
Step 5: Slide Out the Old Shingle
Once all nails are removed, pull the damaged shingle downward and out. If it is stuck, gently wiggle it while pulling. Remove any remaining nail fragments or debris from the area. Inspect the underlayment and deck beneath for damage. If underlayment is torn, apply a patch of roofing cement over the tear before proceeding.
Step 6: Slide the New Shingle Into Position
Align the new shingle with the surrounding shingles so the bottom edge and side edges are even with its neighbors. Slide it upward until the bottom edge sits on the correct exposure line (typically 5 inches exposed for standard 3-tab shingles, 5-5/8 inches for many architectural shingles -- match the existing pattern).
Step 7: Nail the New Shingle
Lift the shingle above and nail the new shingle in place using the correct pattern:
- 3-tab shingles: 4 nails placed along the nail line, roughly 1 inch above each tab cutout and 1 inch in from each end.
- Architectural/dimensional shingles: 6 nails placed along the nail line according to the manufacturer's instructions.
Drive nails straight in, flush with the shingle surface. Do not overdrive -- a nail head that cuts into the shingle creates a leak point. Do not underdrive -- a raised nail will puncture the shingle above.
Step 8: Seal the Repair
Apply a quarter-sized dab of roofing sealant over each exposed nail head. Then apply a thin bead of sealant under the tabs of the shingle above, in the same location as the original adhesive strip. Press the upper tabs down firmly.
Step 9: Inspect Your Work
Stand back and verify the new shingle is aligned with the courses on either side. Check that no nail heads are exposed and that all tabs lie flat. Press the sealed areas once more for good contact.
Tips for Success
- Replace only 1-3 shingles yourself. If more are damaged, the scope of the project increases safety risk and the likelihood of mistakes. Beyond three shingles, get a professional estimate. See Roof Repair Costs for typical pricing.
- Keep leftover shingles. After any roofing job, store a bundle in a dry place for future repairs.
- Photograph the damage before you begin, especially if you plan to file an insurance claim.
- Reuse nail holes when possible. Driving nails into the same holes in the deck avoids creating new penetrations, but only if the old holes still grip well.
- Do not walk on freshly sealed shingles. Give the sealant at least 24 hours to cure.
When to Call a Professional
Consider hiring a roofer if any of the following apply:
- More than three shingles are damaged
- The decking beneath is soft or rotted
- Flashing around the damaged area is compromised (see How to Repair Roof Flashing)
- Your roof pitch is steep (10:12 or greater) -- see How to Measure Roof Pitch
- You are uncomfortable at heights or lack proper safety equipment
- The roof is nearing end of life (see Signs You Need a New Roof)
For a broader view of repair versus full replacement decisions, read Roof Repair vs Replacement.
