I think you should definitely spend time blueprinting your plans - including how many sheets you'll need for each wall. You really don't need anything taller than 7' and if that helps to spread the wood out over a greater square footage, then make it larger than taller. Since I originally didn't think I would want anything larger than 4' x 8' floor space (I was wrong!), I didn't see any point in cutting off that extra foot at the end of the sheet. However, if I had make a larger coop, say 8' x 10', it would have made sense to cut that foot off and use it on another wall to save on cost. I LOVE my passive ventilation design, but don't know if that would work up in Canada too well. However, with that said, this winter has been hugely cold and full of snow (had more here in North Texas just today and the last batch hasn't even melted all the way yet!) and I left the heat lamp on most of the December into January nights. Now that I received my last electric bill, I only do that when it gets into the 20's - ouch! didn't know it would affect my bill that badly!
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