How to Fix a Leaking Cellar Bulkhead

Pinpoint the source of the leak. Bulkhead leaks can come from rusted doors, improperly sealed joints and cracks in the concrete foundation surrounding the bulkhead. To properly treat the problem, you must first determine from where the leak is coming. Look for holes in the doors, cracks in the surrounding foundation or leaks in the joints where the bulkhead meets the concrete foundation.

Seal cracks in the concrete stairs and frame where the bulkhead doors are mounted using a concrete sealant. Dry the area first using high-power fans and then apply the sealant to the cracks. It is best to do this on a dry day with no rain in the forecast so the sealant can dry properly before being tested against outside water.

Apply waterproof sealant that will bond with both concrete and metal around the edges of the bulkhead door, both inside and outside. Again, wait for a day when it has been dry for several days and no rain is in the forecast.

Replace the bulkhead doors if they are rusted or rotting. This is a heavy-duty job, due to the size and weight of bulkhead doors, especially metal one; you may want to call a professional to handle it. To install them yourself, you will need to place a rubber seal between the concrete and the bulkhead door and use a sealant to bond the two together. Bolt the bulkhead door in place.