Bulkhead repair
The outside basement door is one of the easiest ways for rain to reach the cellar. Most leaks start in a handful of places.
Bulkhead repair starts with finding where the water gets in: the doors, the frame, the masonry around it or the ground beside the stairwell. Fixing the wrong one wastes a season. This page walks through the usual suspects.
It prints no prices. It explains the leak, so you know what you are looking at before anyone quotes a job.
What a bulkhead is and why it leaks
A bulkhead is the sloped outside door that leads down to a basement stair. The stairwell below it is a hole in the ground next to your foundation. Rain falls into it, runs down the walls and collects at the bottom.
The door is meant to shed water. The stairwell is meant to drain it. When either job fails, the water ends up on your basement floor.
Check the doors and the frame first
Open the doors and look at the edges. Rusted steel, bent panels and worn seals let water through at the seams. A wooden frame that has gone soft lets it in along the sill.
- Daylight showing along the closed edges means water can follow it.
- Rust blooms and flaking paint point to a panel near the end of its life.
- Soft or crumbling wood around the frame needs replacing, not painting.
Missing or hardened seals are the most common culprit and the easiest to fix. Replace them before you decide the door is finished.
Look at the masonry and the curb
The concrete or brick around the door is called the curb. Cracks there let water slip behind the frame. Mortar that crumbles when you scratch it has stopped doing its job.
Sealing small cracks in the curb is reasonable. Treat a crack that keeps widening as a different problem. If the wall beside the stairwell is moving, read when to worry about foundation cracks.
The stairwell needs a drain
Many bulkhead leaks are not door leaks at all. Water gathers on the bottom landing because the drain is blocked, or because there never was one. Leaves and silt fill it fast.
Clear the drain and pour water down the stairwell to see how quickly it goes. If it backs up, the line is blocked or the outlet has nowhere to go. That is a drainage job, and the window well drainage page covers the same logic for a similar hole in the ground.
Fix the ground around it
Soil that slopes toward the bulkhead delivers water straight to it. The ground should fall away from the doors and the walls beside them. A downspout that empties near the stairwell makes everything worse. The grading and downspouts page covers the two changes that matter most.
Take a position: a new door on a stairwell with bad drainage will leak too. Fix the water path before you pay for hardware.
Where to stop and call someone
Do not dig beside a stairwell wall that is cracked, leaning or pushing in. That is a structural question, and it belongs to a licensed structural engineer. An independent one has no repair to sell you. Replacing a bulkhead can also touch the foundation wall, so ask your local building department what permits apply before work starts.
Frequently asked questions
Why does my bulkhead leak when it rains?
Usually worn seals or a rusted door, a cracked curb, a blocked stairwell drain, or soil that slopes toward the stairwell.
Can I repair a leaking bulkhead door myself?
Replacing seals, clearing the stairwell drain and sealing small curb cracks are reasonable first steps. A cracked or moving wall is a job for a licensed structural engineer.
Does a bulkhead need a drain?
Yes. Without one, rain that falls into the stairwell collects at the bottom and finds its way under the door.
Should I replace the whole bulkhead?
Only after you have fixed the drainage and checked the frame and curb. A new door on a poorly drained stairwell will leak too.
Do I need a permit to replace a bulkhead?
Possibly. The work can involve the foundation wall, and rules are set locally, so ask your building department.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- US EPA. What You Can Do to Soak Up the Rain
- US EPA. Soak Up the Rain. Managing stormwater around a property