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I'm putting FJ cedar clapboards on a small wall, and getting some splitting when I nail them. This happens on the last hammer blow (so, I don't think the nails are the problem) and seems to occur more at the ends. I'm using Maze 'Stormguard' ("splitless") nails, face-nailed above the lap. I think my questions are ...
1. I'm trying to set the nails flush. Should they be left a little proud?
2. Should the claps be tight against the corner boards, or should I be leaving a gap?
3. Would the clapboard overlap affect this? Mine is ~3/4".
4. Something else.