The repair library

See the detail.
Understand the repair.

Explore field videos from the Flat Roof Doctor archive, alongside updated guidance for today’s products.

Chimneys

Chimney Repair Guide: Crown, Masonry, and Flashing

Inspect a chimney from the top down. A cracked crown or open masonry joint can let water enter above sound roof flashing, so sealing only…

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Chimneys

Chimney Repointing or Sealing: Which Problem Are You Fixing?

Loose mortar and a leaking flashing joint are different defects. Repointing restores damaged masonry joints; a compatible sealant repair addresses a specific water-entry detail on…

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Chimneys

Chimney Maintenance Checklist for Roof Leak Diagnosis

A useful chimney inspection follows the crown, masonry body, counterflashing, and roof connection in order. Photograph each area so a repair recommendation can be based…

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Chimneys

Chimney Sealing: Separate Masonry Repairs from Flashing Repairs

A chimney leak may start at the crown, masonry joints, cap, or roof flashing. Treating all four as the same problem can leave the actual…

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Chimneys

Chimney Repointing and Roof Leaks: What Each Repair Does

Repointing repairs deteriorated mortar joints in masonry. It does not automatically repair the roof-to-chimney connection. When a chimney leaks, inspect the masonry and the flashing…

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Chimneys

Chimney Leak Checklist: Crown, Masonry, Cap, and Flashing

A chimney has several water-shedding components. Check each one before assuming that a bead of sealant at roof level will fix the leak. The location…

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Chimneys

How to Narrow Down a Chimney Leak

The useful first question is whether water enters through the chimney itself or through the roof connection around it. Rain direction, visible defects, and the…

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See the detail.Understand the repair.

Chimney Repair Guide: Crown, Masonry, and Flashing

Chimney Repointing or Sealing: Which Problem Are You Fixing?

Chimney Maintenance Checklist for Roof Leak Diagnosis

Chimney Sealing: Separate Masonry Repairs from Flashing Repairs

Chimney Repointing and Roof Leaks: What Each Repair Does

Chimney Leak Checklist: Crown, Masonry, Cap, and Flashing

How to Narrow Down a Chimney Leak

See the detail.
Understand the repair.