2026 project cost
Repair Chimney Flashing Cost
$972 to $1,619 for 1 unit, or about $972.41–$1619.45 per unit. That covers 5 material line items and about 6 labor hours.
Estimate your repair chimney flashing project
Adjust the number of chimneys and state to re-price the job.
Estimated total
$972 – $1,619
materials + labor
What the materials cost
- Materials 64% · $1,033
- Labor 36% · $587
Quantities for 1 unit, including a 5% waste allowance.
| Material | Qty | Cost |
|---|---|---|
| Ice & Water Shield Membrane | 10.5 LF | $210 – $420 |
| Aluminum Flashing | 21 LF | $168 – $378 |
| 301 4.75-gallon Fibered Roof Sealant | 2.1 EA | $102 – $144 |
| 2-in Smooth Shank Electro-galvanized Roofing Nails 3817 -Per Box | 1.05 BOX | $42 – $60 |
| Silicone Caulk | 2.1 TUBE | $17 – $32 |
Links marked to retailers are affiliate links.
How long it takes
- 1
Inspection & Preparation 1 hour
Examine chimney and roof intersection in your area for damaged or loose flashing. Gather necessary tools and materials, and ensure safe ladder placement.
- 2
Removal of Old Flashing 1-1.5 hours
Carefully remove old or deteriorated flashing and any surrounding debris. Clean the area to ensure proper adhesion of new materials in your area.
- 3
Installation of New Flashing 2-2.5 hours
Cut and fit new flashing pieces, secure them with roofing nails, and seal all seams with roofing cement. Ensure a watertight barrier around the chimney in your area.
- 4
Final Sealing & Cleanup 1 hour
Apply additional sealant to all joints, inspect for gaps, and clean up the work area. Dispose of old materials according to your area guidelines.