Originally posted by AWDBOB
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My garage is significantly smaller at 20x28, but you could stand on the runner in the attic and get an inch or two of wiggle perpendicular to the trusses even though the runner was a 7' wide strip of 3/4in OSB. I added another 4' down each side of 1/2in OSB and that movement is now completely gone. That 3/4 the whole way across is going to massively boost the strength of the end walls
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