It will dry out but it will stay swelled for the most part. If you have "H" clips for joining them, just get some bigger ones. Not needed for 16" on center rafters but for 24" on center they are required. Or you can just nail a block in behind the 2 peices to stop the edges from bending when walked on. Don't forget to space them a little 1/16 sides and 1/8 ends.