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Yes....they are on 10' centers. 2x4s are on edge. I questioned the 10' ft centers but Morton has it engineered to go this way. Its all based on snow load and no ceiling being installed. We get very little snow here. Most everything comes pre-cut so it goes together quicker. Everything is nailed with coated ring shank nails.
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While I have full confidence in Morton and their engineers, I seriously question the use of a 2x4 on edge over a ten foot span. Their reputation of building quality buildings is well established, as is their reputation of inventing newer, faster ways to build a building. My concern is that every time that I've seen a 2x4 span 8 feet, it sags. A lot of the time it's just being stored for future use, and over time, it will sag under it's own weight. <br />
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In every building that I've seen, and everything that I've read, to span ten feet, you need to be using 2x8's on edge.</div>