Last year have very little nectar flow, had a lot of honey supers foundation that had a little comb build on them or had none at all, stayed on hive until July or August, took off. Put in storage with
Will the bees build up the foundation or will I need to put new foundation in the honey supers?
Just put them on for the honey flow and they will finish builing it out and fill it up.
Just make sure the foundation didn't warp or fall out. Sometimes when it's on the hive a long time and the bees don't draw it, it will get pretty crooked. If you used paramoth, make sure you air it out good for a day or two before putting it on the hive.