Adding brood box to 14x12?

[robmort]

My 14x12 hives are so packed with bees, even with 2 supers on in some cases, that they look short of space and inspection means clearing so many bees from surfaces and squashing many which doesn't help their temper, that I wonder if it's wise to add a super as another brood box, though I'd rather avoid it. I've never heard of this though and I thought the BB should be big enough?

 

[Ian123]

Personally dislike 14x12 it’s basically a brood and half space and prolific queens can require more. I have mine on dbl broods and for me it’s a far more flexible arrangement. My extractor can also handle them so they are also used as supers. Ian