I'm having a house built and they just finished laying down the roof sheathing....half inch plywood. This is in Florida. They have used metal clips between the trusses to help align the sheathing panels, but some of the panels are really warped and I'm concerned about whether the edges will create visual problems with the finished roof....or worse yet, reduce the life of the shingles. In some cases, the panel edges between trusses are over half an inch off....from in the attic I can see the full edge of one panel drooping below the the adjacent panel. I don't know what is reasonable....I know it can't always be perfect, but this look slovenly and not right at all. Any input from someone with a building trades background would be most appreciated. I don't want to raise the issue with the builder if this is what most would consider acceptable.
I would say it's not acceptable for a couple reasons. 1) 1/2" plywood??? I would say 5/8 minimum if the spacing is 16" O.C., but I tend to overbuild. 2) The seams shouldn't "droop" apart. The H clips should stop this from happening and if it IS happening, it sounds like some of the clips are missing. In FL, I think the H-clips are required in each space on each sheet (Teetor can help more with that).
Basically, if you think it's not right, it's not right. It's YOUR house and, as long as you're being reasonable, it should be the way YOU want it.