"Kim" writes:

Thanks for the reply. It is very hard for me to measure the tilt, since
it is covered by carpet. Acturally, they are subfloor. But I can feel
the uneven of it.

A long, say, 4' inexpensive level laid across the carpet, a right
angle, and a protractor would be sufficient to quantify how
significant the issue is.

The level can be reused for installing shelves. :-)

--
Todd H.
http://www.toddh.net/