Bar spacing on a Warre hive

[Bigfoot]

Hello fellow beekeepers I have a question, I was wondering  what is the space between the bars on a warre hive. I'm thinking of building one but all the plans I've found are not very clear on the spacing of the bars, any info would be appreciated.

[Robo]

My Warre' hives are 12" x 12" inside dimensions.  I use 8 bars (7/8" wide) evenly spaced (~9/16" between bars).   Works well and have never had any bad comb drawn.

[Michael Bush]

It's the space on center that is important.  That should be between 1 1/4" and 1 1/2".  The bees prefer 1 1/4" for brood and 1 1/2" for honey...  If you do them all the same 1 3/8" would be right.