neither . 3/4 wil sag for sure on a 2' center. the houses we frame the subfloor is 1 1/8 thick its called spandex it expensive but worth it also there is a new product if you are looking to sheet were walls and roof that require no tyvek of roof felt this company also makes a decking with a 1 yr no sand gaurentee which meens that from the day you lay this stuff the seams will not swell in the weather due to the house not being "blacked in" call me if you have any questions 225 610 4212
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