Basement Window Leaking Under Deck

The tight space blocks air flow and keeps the wood damp leading to rot and decay.

Basement window leaking under deck.

If it does solve the problem your choices are to leave the plywood in place or replace it with a plastic window well cover if there is enough room below the deck. It is a regular water highway. During the winter months blowing snow sits on top of the porch then on slightly warmer days it melts and leaks into the basement. Someone noticed that water had been getting inside and caulked things up.

Under the deck there is plastic and then gravel about an inch. But because the window is under a deck and can t serve much purpose the best approach would be to have it bricked in and waterproofed from the outside and have the well removed. It doesn t look like the builder did anything to seal this window. There is a slight gap between that ledger board the one you are looking at bolted against the house and the house itself.

Water wicks inside on those bolts or tubing. Looking from the inside it looked like an aquarium. The first things to are your gutters and window well. Wellduct drains water from the window well before it can leak through the basement window.

The water leaking down saturates the wood between the tongue and groove. The water level that night was about half way up the window. Not sure how it pooled up that quickly under the deck but it did. Poor drainage around your home can allow water from rainfall melting snow or the ground to fill your window wells and enter into your basement.