On Oct 13, 10:59*am, dpb wrote:
stryped wrote:

...

This is a 30 x30 garage with a metal roof. I think it is a 3 or 4 12
pitch. My ideas was to add 2x4's every 4 feet between trusses and use
7/16 osb for a ceiling. If everyone here thinks it might sag or is a
bad idea, I thought abotu using 4x8 insulated panels? I wonder how
that would look?

Read (and heed) Bob's (aka fft) answer -- it depends _entirely_ on the
truss design and we can't tell from here.

Chances are you're ok, but you need to go research the truss or get an
expert opinion. *Call a local truss company; they have the poop given
the dimensions and construction details...

--


OP-

How old is the building? Do oyu know the designer / builder / truss
engineer / truss mfr?

For a reasonable cost the truss engineer (if you can identitfy him)
should be able to give a quick design of what you'd need to add to the
truss to handle your ceiling load. For him it will be a snap.

I was thinking about using tile (fake shakes) on an 80 year old house
& paid a roofing enigneer $300 to come out, check out the roof & give
me a strength upgrade design.

I "might" (personally) consider "winging it" but I'd for sure have
one on my associates (CE/SE) lay eyes on it first


also....Metal roofing is not all that lightweight 20 gage steel would
be ~equal to 7/16 OSB.
Drywall even heavier.....a light but still non-zero load would be
ceiling tiles / that Homesote(?) crap

I think you'll be in the 1 to 2 psf (pounds per sq ft)
range.......for the entire roof system, probably not a deal killer but
getting the trusses to handle the loads locally might be a problem.

Get your trusses looked at, modify them as needed & install your
ceiling

cheers
Bob

All- Note screen name / handle change....I don't know how I switched
from BobK207 to fftt....I'm justt a dumb Google Group user.
But I tried to follow Duane's example but my initials were taken

so now a more meaningful hybrid