Hatchway entrances leak from three critical points:
1. Underneath Metal Hatchway Doors
Metal hatchway doors are not flush with the concrete frame they’re attached to. As rain builds up on the doors, it will slide down the doors and pool on the concrete around the edges of the doors.
From this point, the water has two paths that it can follow — it can either continue to flow down to the ground, or it will slip underneath the metal hatchway door and onto the stairs inside the hatchway.
(Above) A hatchway entrance constructed separately from the rest of the home. This makes it vulnerable to flooding from many different areas. (Below) This diagram of a flooding hatchway entrance shows how water flows in from around the hatchway doors, through wall cracks, and where the hatchway door and your foundation walls meet.
2. Where The Hatchway And Foundation Meet
The concrete shell of the hatchway is mounted to the foundation walls via bolts, which are drilled through the concrete of the foundation.
Because it’s rare for this joining point to be sealed by the contractors, it is a major weak point where water can flood through to your basement.
As groundwater builds up around the foundation during a rain event, it presses in on this weak spot and allows significant flooding.
3. Through Cracks In The Concrete
Like any concrete structure, a hatchway entrance will begin to form cracks over time. Water will flood through these cracks, move to the stairs, and end up flooding into your basement area.
Some old-fashioned hatchway doors were built with loose panels of wood (instead of metal), with little or no attempt to keep water out. Water easily floods through the gaps in these doors.
Once water builds up in a hatchway entrance, the puddles will expand into the basement.
Our grated drain system installed on a leaking basement staircase in Darby.
The TrenchDrain™ system is designed with a grated opening on top that collects water and sends it to your perimeter drain.
Meant as part of a perimeter drain system, it’s a great way to keep hatchway flooding out of the basement, and away from your furniture and belongings.