I have a new home built in 2007. It has a full basement with the lowest course of cement block having weep holes between each block. They are actually slits where it looks like no mortar was applied. I understand that this to allow water that may be have seeped into the block to escape into the gap between the basement floor and the wall
My question is I notice that there is a lot of cold air coming through these slits into the basement. Would it make sense to try and plug these for the winter and they remove the plugs in the Spring?