wrote:
I am cutting (3) 4x4 support posts for beams supporting the joists of
a deck. One corner post is at the height I need. The posts are 10'
apart. Can I set a straight 2x10 on edge on the correct corner post
and use a level at the next post to determine the correct height so
that the post is level with the corner post? How accurate is a level
used at the end of a 10' board?
Once the second post is level with the corner post I was going to use
the same technique until all the posts were level? Is there a better
way to make sure the posts are level over 30'?
thanks tom

Yea - Water levels are good for this, as others have said.

Other options
-Transit

- String level (Sag is a problem over a long distance and not a great
choice)

- laser level - This is what I would use (I have one already) B&D ones
are cheap and will do the trick
http://www.blackanddecker.com/Produc...Path=1496.1513
Make sure you get an auto leveling type. I have this one
http://www.blackanddecker.com/Produc...ProductID=7859

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