so, i'm having new flooring put in my hallway - long story short, we need new subfloor. existing is 1x6 on a diagonal. that's all cut up and laying plywood. there was a seam cut on the 1x6's on one wall of the hallway, as shown below. the 1x6's continue into the next room. joists are in red, lol. do i need to block the seam all the way down as shown below? I've read that edge blocking isn't required when using 5/8" cdx.