Lots of cold air coming through a variable narrow - about 1-2 cm (0.5 in) - gap between a wooden beam and the concrete wall in the basement (image 1 below).
What can I fill it with? Worried about moisture collecting and eventually ruining the beam.
Noticed that on another beam a similar spot was treated with something (picture 2); there is even a solidified translucent amber-like drop clearly visible on the picture. What can this material be?
Right next to it there's aluminum ducting going into the same wall treated with expanding foam; there is a layer of wood on top of the wall so concrete itself is not visible (picture 3). Can I just fill the gap with similar stuff?