> The only issue I have with leaving the supers on in late spring is the 
> bees try to build comb in the spacer.

That is the case.

> Why would you leave an inch spacer on all year if you do not mind my 
> asking.

I didn't.  They were originally a winter inner cover, but the bees ate out 
the styrofoam from the one side before I bought them.

I only used them in winter. The bees seemed to like the clustering room.  I 
don't think the bees did better with them than with normal bee space - or 
none like I use now.  I currently use pillows.

YMMV 

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