Measure down the same distance from the fascia or top of siding (it
might not be level but will look level compared to other lines of the
house). Tack the chalkline at that measured point. Check with bubble
level to see how the line lays. Snap.
Water level or laser. Laser is simple. Water level will get it close as a
gnat's whisker. Water level is cheaper, and you will use it on a lot of
more projects. Easy to master, simple in principle. A good laser is also
good, but you have to spend $$$ for a good one.
I have a small 'line level' that simply hooks into the center of the
chalk line. With one end firmly attached, the other end of the line
can be raised or lowered incrementally until level. Only takes
minutes, seems perfectly accurate and IIRC it cost about $5 or so at
local lumber yard, hardware store or Ace, maybe. First time I saw one
being used was a siding installation crew. Ought to work for you.
The trick with a line level is to level the 2 end points over a long
distance, then remove the level and pull the chalkline taut between
the 2 points before snapping.
Over 27' feet, the level is going to bow the line downward
significantly, so the only 2 level points along the line will be at
the very ends.
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