I used to always wonder why it was sooooo cold in the back bedroom during the winter....no matter how high we had the heat in there.... I found out.I put a good sized screwdriver straight back into that "crack" ... it went up to past the handle!
The white dripping down is the primer I used last time I painted the room.... I miss that green but it was time for a change.... and Cassie wanted pink. :)
The "crack" is now filled with the expandable foam stuff... hopefully it will be warmer in there IF I am still here next winter... or for who ever moves into here after I am gone.