Elt.
Whats a JD brood chamber ,excuse me i don't know. Understand your supering slowly 3 at a time using void insulation blocks on out side .
Okay Mike, sorry... I did think I had run across you elsewhere as an "experienced beek", mybad --- as
youse guys say :-)
"FD broodchamber" is a full depth Langstroth box, with wired in foundation.
It is a 10 frame box design, but knowing BKs here use 9frames in the config
which allows some leeway for spacing of the broodnest frames among the stores frames. A downside
is the burrcomb build towards the outer frames
so the broodchamber gets a close inspection every other month or so, depending on locale.
And yes, the void blocks can be polyfoam in starter colonies and once at CM (critical mass) the blocks
are replaced by bee-tight divider boards which are then moved over as frames are added.
Commercial BKs would never use foundationless here, yet that has it's place with some cottage industry
types selling "comb honey" and us newly moulded "nature phreeks" switching to TopBar style designs.
I tried foundationless (wholly) in the broodchamber these past months and found the drone cell
randomness not efficient - in my view - so I won't be doing that again, restricting foundationless to frames
#1+#8+#9 in future.
Clear now? ;-)
Bill