With the basement now being heated, and winter approaching, the last thing to close up was the gap between the two entry doors. Because one of them is slightly warped, we had to use channel weatherstripping.

To start, a channel was routed down the edge of the main door that meets the opposite door.

Then the weatherstripping track was placed in the channel and screwed in place.

Next, the weatherstripping got slid into the track.

The door was rehung...

...and TADA! The only daylight showing through is where the hardware is.