
Using nylon string to verify locations of walls for
plumbing, electrical, heating and air-conditioning and even structural
framing components, is how the professionals do it.
The string can be strung out and pulled tight like the picture above and
then any plumbing or electrical pipes that will be coming out from
underneath the floor, can be positioned in just the right location to
avoid framing problems like, pipes sticking out of the walls.
Professional home foundation builders use nylon string for straightening
long foundation walls and footings. I never leave home without it.

In the picture above, you can see how the plumber used
nylon string to correctly positioned the water and waste pipes for the
plumbing. This allowed the plumbers to install their pipes before the
floor was sheeted with plywood.
The plumbers job would have been more difficult, if they waited until
the house was framed to install their plumbing. Could you imagine how
hard it would be to crawl underneath the house with all of your tools
and pipes, to install the plumbing, after the flooring had been
installed.
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