Fix a bulkhead that leaks

Steps

Goal: Confirm where water enters, then apply the correct fix—drainage, caulk, flashing, or door seal.

• Check where the water appears: frame, doors, or bottom of the stairs.
• If water runs down the stairs or pools at the bottom during or after rain, the bulkhead is the source.
• If water appears on basement walls or floor away from the stairs, the source may be elsewhere—see Fix a basement wall that leaks or Fix a foundation crack that leaks.
• Good: You know the bulkhead is the source.
• Bad: Unclear—wait for rain or run a hose to observe.

Drainage path

Goal: Fix grading and downspouts so water drains away from the bulkhead.

• Inspect the ground around the bulkhead. If water pools during or after rain, or the ground slopes toward the house, fix drainage before resealing.
• Check that downspouts direct water at least 4–6 feet from the foundation. See Fix a downspout that overflows.
• Improve grading so the ground slopes away from the house (at least 1 inch per foot for 5–10 feet). See Fix grading that slopes toward the house.
• If a drain exists at the bottom of the stairs, clear debris from the grate and flush with water.
• Good: Water drains away from the bulkhead after rain.
• Bad: Water still pools—call a contractor for drainage work.

Frame and flashing path

Goal: Find and fix leaks where the frame meets the foundation.

Inspect caulk and flashing

• Examine the caulk where the bulkhead frame meets the foundation. Cracked, peeling, or missing caulk lets water in.
• Check the flashing where the frame meets the foundation. Bent, loose, or missing flashing directs water behind the frame.
• Good: You see gaps in caulk or damaged flashing.
• Bad: Caulk and flashing look intact—check the door seal next.

Recaulk the exterior

• Scrape out old caulk with a putty knife. Clean the surface with rubbing alcohol and let it dry.
• For wide gaps, press backer rod into the gap before caulking.
• Apply a continuous bead of exterior-grade silicone or urethane caulk. Tool the bead with a wet finger or caulk tool for a smooth seal.
• Let the caulk cure per the product label. Test with a hose (low pressure) or wait for rain. You should see no water entering.
• If flashing is damaged, call a contractor—flashing repair often requires excavation or foundation work.

Door seal path

Goal: Replace the seal between the bulkhead doors when water enters there.

• Check the seal or gasket where the two doors meet when closed. Worn, cracked, or missing seals let rain in.
• Remove the old gasket. Clean the channel. Install new foam or rubber weatherstripping that matches the channel.
• You should see a snug seal when the doors are closed. Test with a hose or wait for rain.

Clogged stairwell drain

Goal: Clear a clogged drain at the bottom of the bulkhead stairs.

• Locate the drain grate at the bottom of the stairs. Remove debris (leaves, dirt) from the grate.
• Flush with a hose or bucket of water. If the drain does not take water, it may be clogged deeper in the line.
• If the drain still does not work, call a plumber or drain specialist. You should see water draining when you pour it in.

When to get help

Call a contractor if:

• The leak comes from foundation cracks.
• The bulkhead frame is structurally damaged.
• You need to regrade or install a drain and are not comfortable with the work.
• You have recaulked and improved drainage but the leak continues.
• Flashing repair requires excavation or foundation-level work.

For related fixes, see Fix a basement wall that leaks, Fix a basement window that leaks, Fix a basement that floods, Fix grading that slopes toward the house, or Fix a downspout that overflows.

Verification

• Drainage: No water pools at the bulkhead after rain; grading slopes away; downspouts direct water 4–6 feet from the foundation.
• Frame seal: No water enters where the frame meets the foundation; exterior caulk is continuous with no gaps.
• Door seal: No water enters between the doors when closed; weatherstripping seals the gap.
• Drain: If a drain exists, it clears and takes water when flushed.