I'm getting ready to apply some vinyl siding to a new build, and the measurement between soffit and bottom lip of the OSB sheathing varies by 1/4" to 3/8". When I shot a "level line" across a few of the walls, and then measure up or down from that level line, again I can see that the wall itself basically grows and shrinks in height. I don't want my siding corners to not line up, but I also don't want my last course of siding to be wavy.
Should I set my starter strip measuring from the level line shot with a transit, or go off my OSB edge and then just make sure that X row of siding is the same distance to that line each row? I've found that the siding can fluctuate a good 1/4" just by how loose or tight it is and on temperature. I feel I am wasting time trying to find how to start this job and set the starter strips.