"PVR" wrote in message
...
I'm finishing my basement. Before starting, the joists supporting the
first
floor were very visible. I want to put in a ceiling in part of the
basement
and I can use either drywall or a drop ceiling. I understand that if I use
drywall I must use 5/8" type for fire resistance purposes. If I install a
drop ceiling this will be the kind where the 2' x 2' tiles are supported
by
plastic extrusions (CeilingMax/GridMax system) which are attached directly
to the joists. This gives a drop which is only 1.5" below the joists. I
have
two questions.

1). If the joists are currently unprotected why is it necessary to use
5/8"
drywall for the ceilings in the finished areas?

2). If I use ceiling tiles supported by plastic extrusions, the plastic
would melt in a fire. How can the drop ceiling be a satisfactory
alternative
to a 5/8" drywall ceiling?

I prefer the drop ceiling because there are several electrical junction
boxes attached to the joists and I assume reasonable access to these
should
be provided.

Peter.




Does your local ordinances specifically state you must use 5/8" ?
Few residences require it, more only in multi family (apartments) or
commercial buildings.

Mind you if you can do it, 5/8" always give a nicer finish, and stops more
noise.

While I personally like drywall instead of ceiling panels, if you have
electrical boxes scattered around it you do have to leave them accessible so
the dropped ceiling may be your best bet.

Once again fire regulations are different for homes so the plastic strips
may be fine.
If in doubt, phone your fire department.


AMUN