How to Fix a Leaking Roof

Roof leaks rarely happen without warning signs. Understanding what causes them helps you prevent future problems and communicate better with contractors about what needs fixing. And when you're getting repair quotes, you'll know exactly what work should be included.

• Damaged or missing shingles: Wind, age, or impact damage creates gaps where water enters. Storm damage? Check if your insurance covers it.
• Flashing failures: Metal flashing around chimneys, vents, and valleys is a top leak source when it rusts, lifts, or wasn't installed correctly.
• Clogged gutters: Water backs up under shingles when gutters overflow, especially at roof edges.
• Ice dams: In cold climates, melting snow refreezes at roof edges, forcing water under shingles.
• Cracked vent boots: Rubber boots around plumbing vents crack over time, letting water in.
• Valley problems: Roof valleys channel lots of water; improper installation or damage here causes serious leaks. Repair costs vary widely—see our cost breakdown.

If your roof is actively leaking and you can't get a contractor immediately, these temporary fixes can minimize interior damage until professional help arrives. For a complete guide on handling sudden damage, see our emergency repair guide. Safety first: Don't go on your roof in bad weather, at night, or if you're uncomfortable with heights.

Tarping (Most Effective)

A quality tarp secured with 2x4s or sandbags can stop active leaks temporarily. Extend the tarp from the ridge down past the leak source. This is the best DIY emergency solution—it works and it's relatively safe from the ground if you can access the leak area.

Roofing Tar or Cement

Small holes or cracks can be temporarily sealed with roofing tar applied with a putty knife. Clean the area first for better adhesion. This only works in dry conditions and is temporary—water will eventually work around it.

Interior Damage Control

Inside, move furniture and valuables away from leaks. Place buckets to catch drips. Use plastic sheeting to protect floors and remaining furniture. Poke a small hole in bulging ceiling bubbles to let water drain in a controlled way rather than soaking drywall.

Once weather permits, professional repairs address the root cause, not just symptoms. Here's what contractors typically do depending on the leak source. For detailed pricing across all repair types, check our complete cost guide.

Flashing Repair/Replacement ($300-$800)

Contractors remove damaged flashing, install new step flashing or continuous flashing, and properly seal it to prevent water infiltration. This is meticulous work that needs to be done right—poor flashing is a recurring leak source.

Shingle Replacement ($200-$600)

For leaks caused by damaged shingles, contractors replace affected shingles and inspect surrounding areas for hidden damage. Sometimes what looks like a single damaged shingle reveals water damage to the underlying decking. Material matters too—learn more in our roofing materials comparison.

Valley Repairs ($400-$1,200)

Valley leaks often require removing shingles on both sides of the valley, replacing underlayment, installing new valley flashing, and reinstalling shingles. It's more invasive but necessary for a lasting fix.

Structural Repairs ($1,000-$3,000+)

If leaks have caused rotted decking, damaged rafters, or compromised the roof structure, costs escalate. This requires removing roofing materials, replacing damaged wood, and reinstalling everything. Don't skip this—structural damage only gets worse.