Re: Adding 11-frames supers
The 11 frames per box is only in the brood nest area. Honey supers can be 9 or 8 frames in a 10 frame box.
My answer for the supers is that ONCE THEY ARE DRAWN you can put 9 or even 8 in the ten frame supers with good effect as the combs will just be thicker. But when it's bare foundation, the bees will often mess up the comb if you space it more than ten. Ten frames of bare foundation should always be tightly together in the middle of either a super or a brood box in order to prevent the bees from attempting to build a comb between the foundations instead of on them. With eight frame boxes you can do seven drawn combs or even six.
USDA Zone 7A Elevation 1400 ft