On Tue, 14 Dec 2010 16:08:38 -0500, Bill wrote:

chaniarts wrote:
Bill wrote:
Larry Jaques wrote:

What is the purpose of the furring strips, Bill? Electronic ballasts
don't get hot, the ceiling is flat, and the fixtures are flat. Butt
'em and forget 'em.

Temperature of attached garage varies between about 25F and 110F, and
humidity varies too. I know most expansion/contraction occurs between
the annular rings, but some also occurs along the grain too. Shouldn't
one leave space for it? Assume 6' to 8' std onebyfour lumber. This
looks like something I should be able to look up in a table (maybe
someone has a link handy).

Bill

no. the drywall won't be moving. even if they did, what do you expect to
occur? they fixtures will give a little because the screws holding them to
the ceiling won't fill the holes completely.

Not talking about the drywall moving, rather the "furring strips" that
the lights are mounted to. Larry suggested mounting the 1by4s to the
studs end-to-end. It was suggested to mount these from wall-to-wall. I

I most certainly did NOT, Bill. I told you to mount the lights in that
orientation and asked WTF? when you started on about furring strips,
which are unnecessary, unless you have some nastyass warts on your
shiny new fixtures. Most are built to mount flat against the wall or
ceiling.

--
Know how to listen, and you will
profit even from those who talk badly.
-- Plutarch