Hot answers tagged barn
3
Gluing won't hurt, but it won't help either (in this application) so I wouldn't bother.
Where gluing does help is when you are doubling a beam by stacking two smaller beams on top of each other. (i.e. 2 2x4's to make a 2x8) Gluing will then help transfer the longitudinal shear stresses that develop when the beam bends slightly. (To visualize this shear, ...
1
The links in the other answers are very informative!
In answer to your question:
So: is the fiberglass a bad idea?
The answer is yes, at least in the exterior walls.
In answer to your question:
If so, what should I do instead?
You have a bunch of options, none as cheap as simple fiberglass batts. My personal recommendation would be rigid foam ...
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