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Insulation – Replacing roof underlayment costs $1,100 to $9,000 or $0.75 to $4.00 per square foot.

Roof structure and water damage may require replacing decking, underlayment, and roof material.Ĭleaning – Roof cleaning costs $250 to $600 or $0.15 to $0.70 per square foot on average, depending on the cleaning method. Water damage – Roof structure repair costs $500 to $3,000, depending on the severity. Decking, or sheathing, is the plywood layer between trusses and roofing material. Roof decking – Roof decking replacement costs $2 to $5 per square foot. Rafters should be repaired or replaced if there is water damage or wood rot. Rafter – Rafter repair costs $300 to $1,700+. Flashing is typically metal and prevents leaks around fixtures. Completely replacing and resealing all flashing costs $400 to $1,000. Severe cases may require replacing rotted rafters or a full roof replacement.įlashing – Roof flashing repair costs $200 to $500 on average for skylights, chimneys, and vents.

Fixing minor sagging may only require basic rafter ties. Sagging / pooling – Sagging roof repair costs $800 to $2,500 for sections up to 100 square feet. These issues are typically caused by sun exposure, severe weather, and age. Blistering, cracking, alligatoring repairīlistering / cracking – Repairing a blistering, cracking, or alligatoring roofing membrane costs $250 to $1,250 on average.