How to Fix Raised Shingles on a Roof

Raised shingles can indicate moisture damage, improper installation, or wind uplift. Addressing the issue promptly protects the roof deck, prevents leaks, and extends the roof’s life. This guide explains how to identify, assess, and repair raised shingles, with practical steps for common asphalt shingles and safety tips for DIY repairs.

Causes Of Raised Shingles On A Roof

Raised or buckled shingles result from several factors. Moisture infiltration behind the shingles due to poor ventilation or a damaged underlayment can cause buckling. Improper nailing, overdriven nails, or nails that miss the shingle fastenings can allow edges to lift. Temperature fluctuations and sun exposure can also cause shingles to warp over time. Wind uplift can raise edges, especially on lower slopes or in storm-prone areas. Identifying the cause helps determine whether repair is sufficient or if replacement is needed.

When To DIY Or Hire A Professional

Do-it-yourself repairs are suitable for isolated, small buckles on a single course with intact underlayment. If multiple shingles are cupped, the underlayment shows damage, or there is visible sagging, mold, or water intrusion, a professional assessment is advised. Roofing work is hazardous from heights and involves potential electrical and structural risks, so safety considerations should guide the decision. Local codes and warranty terms may also influence whether DIY is appropriate.

Safety And Preparedness

Before starting, ensure you have appropriate gear: a sturdy ladder, non-slip shoes, fall protection if needed, and weather-appropriate clothing. Work on a dry, calm day to prevent slips. Use caution near ridge lines and around flashing. Have a helper to hand you tools and to hold the ladder steady. For safety, avoid working on wet or icy roofs and never work alone on high-pitched roofs.

Repair Steps For Raised Shingles

Identify whether shingles are merely raised at the edge or show buckling across the panel. The following steps cover common repair scenarios for asphalt shingles with intact underlayment.

• Inspect and mark: From a ladder, inspect the affected area. Mark raised shingles to distinguish them from undamaged ones.
• Check underlayment: If the underlayment is damaged or detached, it should be replaced before resealing shingles. If water intrusion is present, address leaks first.
• Re-nail if edge-lifted: For shingles with lifted edges but intact heads, remove the lifting nails carefully and re-nail with corrosion-resistant roofing nails 3/4 inch longer than the original nails. Drive nails straight, not overdriving them.
• Seal with roof cement: Apply a bead of roofing cement under the edge and press the shingle back down. Cap with a dab of sealant on the nail heads to prevent water entry and to secure the edge.
• Slide a shim under the edge: If the shingle edge cannot be pressed flat, insert a thin shim or flap of new roofing material under the edge near the nail line and re-nail over the shim to pull the edge tight.
• Seal exposed nails: After resealing, place a small amount of asphalt roofing cement over each re-nail to prevent water ingress.
• Flash nearby joints: Inspect and reseal any flashing near chimneys, vents, or valleys that may have shifted, as these areas are prone to leaks.

When Shingles Must Be Replaced

Replacement is necessary when shingles are severely warped, torn, or if the underlayment is damaged. If multiple consecutive shingles bow or buckle, a broader section may require replacement, which involves removing the damaged row, inspecting the roof deck for rot, and reinstalling with properly aligned new shingles. Replacement adheres to the roof’s existing overlap pattern to maintain weatherproofing and wind resistance.

Preventive Maintenance To Minimize Future Raises

Prevention reduces the likelihood of raised shingles. Ensure proper attic ventilation to regulate moisture and temperature, which minimizes deck warping. Use adequate insulation to reduce heat buildup that can warp shingles. Schedule regular inspections, especially after severe weather. Clean debris from gutters and valleys to prevent water pooling and ice dams in colder climates. Consider upgrading to higher-quality shingles with wind resistance and a warranty that covers lift issues. A well-ventilated, dry roof deck significantly lowers the chance of future buckling.

Tools And Materials You May Need

• Ladder and fall protection
• Flat pry bar or putty knife
• Roofing nails (galvanized or coated)
• Hammer or nail gun
• Roofing cement or sealant
• Sealant applicator
• Replacement shingles (same style and color)
• Underlayment material (if damaged)
• Utility knife and marker

Common Mistakes To Avoid

Avoid over-nailing or driving nails too close to the edges, which can split shingles. Do not leave damaged underlayment unrepaired, as this compromises waterproofing. Avoid applying sealant extensively on the deck without ensuring proper shingle alignment, as pooled sealant can trap moisture. Never attempt repairs on a wet roof or in windy conditions that could cause loss of balance or tool mishaps.