When a builder refers to something as being plumb, or out of plumb he Say you set the recovery profile 6M away from the real one, then it is a case of a simple 6M measurement offset to get back to the original set out, rather than starting from scratch again, squaring etc. One a similar vein, sometimes when you have to get machinery into a job, rather than pull out the profiles that are in his way, first set up some offset or recovery profiles. I bang a nail into a brick joint or a peg touching the wall, and string a line, shown dashed, to fix the true building line.I then measure back the offset distance to get a point exactly in line with the wall.I make sure the string line is offset the same distance from the house,and then I put a nail or a screw into my profile at the continuation of that line.I just pick a distance from the house that gets me clear of the various obstructions.I want to mark out, on my profile (to the left), a building line for a new extension, that is exactly a straight continuation of the main house wall.In the sketch above I show another method of using the line with an offset.String line - Offset line around obstacles. A good string line should have a fair amount of stretch in it.In a long run of string you may get sag in the line, pick a point about the centre and pack it up until when you sight along the line from one end it looks straight.If you don't use the packers, there is a danger of each joist lifting the line a small amount and you finish up with a curve.
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