Replace a damaged gutter downspout
Fit matching sections and elbows so roof runoff reaches its intended discharge point.
Lawn & garden · 2–4 hr · Medium
Before you start
Use suitable stable access and a helper for long sections. Never support a ladder on a gutter or overreach. Stop if safe access is not possible. Wear eye protection and cut-resistant gloves; freshly cut sheet metal is sharp.
Tools and materials
- Matching downspout sections, correctly oriented elbows, straps, compatible fasteners and specified sealant
- Tape measure, level, screwdriver/drill, snips or fine-tooth saw, crimper if needed, file, gloves and eye protection
Check the problem
Check the whole route
Confirm the outlet is sound and blockage is not the real problem. Match downspout dimensions and elbow orientation. Retain a discharge route that carries water away without creating a trip hazard or flooding a neighbor.
Check supports and access
Inspect strap anchors and wall backing. Plan safe access to the upper joint before removing anything. Do not use the pipe itself as a handhold or support.
Steps
Record the arrangement
Photograph joints and strap locations. Measure sections and offsets, including overlap at each connection. Keep parts organized by position so elbow direction is not reversed.
Remove the damaged sections
Have a helper support the pipe while you release straps and joint fasteners. Lower sections under control; do not pull on the gutter outlet or bend its attachment.
Cut and prepare replacements
Mark measured lengths accounting for overlap. Clamp, cut and deburr the metal. Crimp only where the system needs a male end, avoiding crushed or sharp obstructed openings.
Dry-fit the joints
Arrange upper sections so their outlet ends enter the lower receiving sections in the direction of water flow. Check offsets, wall clearance and final discharge before fastening.
Secure joints and straps
Use the system’s specified fasteners and any required joint sealant. Anchor straps to sound backing with appropriate exterior fasteners; support the pipe without crushing it or blocking drainage.
Check water flow
Run a controlled hose test from a safe position and inspect joints, outlet and discharge. Correct leaks, pooling or movement. Confirm runoff goes away from the foundation and no sharp edges remain exposed.
Run a controlled hose test from a safe position and inspect joints, outlet and discharge. Correct leaks, pooling or movement. Confirm runoff goes away from the foundation and no sharp edges remain exposed.
Tips
Buy matching elbows
Front-to-back and side-to-side elbows serve different offsets.
Keep fasteners appropriate
Unnecessarily long screws can catch debris inside a narrow pipe.
Follow the water
A new pipe will not fix a blocked underground drain or a splash block pitched toward the house.