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Posted by Twayne on October 13, 2009, 1:57 pm
>>>> My detached garage with metal siding has 2x4 trusses spaced 4 feet
>>>> on center. Can I install a ceiling or will this be too much weight
>>>> and cause sagging/or other problems?
>>> 4' on center? What's on top of the trusses that's spanning 4'? With
>>> that spacing - a likely cost saving measure - it's unlikely there's
>>> a lot of leeway in the load handling capabilities of the roof
>>> framing. You'd have to frame a ceiling before you could cover it,
>>> and with 4' between trusses that wouldn't be easy to do with a
>>> light structure. The lightest ceiling I could think of would be the
>>> plastic corrugated roofing stuff, and that would still sag a bunch
>>> with 4' spacing.
>>> R
>> A hanging ceiling is very light and could likely be used. Don't know
>> about adding lights to it though. Check with your local code office.
>> No one here can tell you for sure.
> 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?
But your local code enforcement will have the final say on whatever is
acceptable. I'm going to guess that you're in an area where you don't
get snow because that method could never meet roof snow-load
requirements up here. So if you are in an area that gets snow, I think
you're in trouble before you even start. If you don't have the design
specs for it, you might need an engineering assessment just to pass code
as it is. Don't take chances because they could make you tear it down.
And like I said, the local code office will have final say on
everything.
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Posted by IGot2P on October 13, 2009, 7:31 pm
Twayne wrote:
>>>>> My detached garage with metal siding has 2x4 trusses spaced 4 feet
>>>>> on center. Can I install a ceiling or will this be too much weight
>>>>> and cause sagging/or other problems?
>>>> 4' on center? What's on top of the trusses that's spanning 4'? With
>>>> that spacing - a likely cost saving measure - it's unlikely there's
>>>> a lot of leeway in the load handling capabilities of the roof
>>>> framing. You'd have to frame a ceiling before you could cover it,
>>>> and with 4' between trusses that wouldn't be easy to do with a
>>>> light structure. The lightest ceiling I could think of would be the
>>>> plastic corrugated roofing stuff, and that would still sag a bunch
>>>> with 4' spacing.
>>>> R
>>> A hanging ceiling is very light and could likely be used. Don't know
>>> about adding lights to it though. Check with your local code office.
>>> No one here can tell you for sure.
>> 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?
>
> But your local code enforcement will have the final say on whatever is
> acceptable. I'm going to guess that you're in an area where you don't
> get snow because that method could never meet roof snow-load
> requirements up here. So if you are in an area that gets snow, I think
> you're in trouble before you even start. If you don't have the design
> specs for it, you might need an engineering assessment just to pass code
> as it is. Don't take chances because they could make you tear it down.
> And like I said, the local code office will have final say on
> everything.
>
You should remember that not everyone has to meet any code of that type.
Not everyone lives the same place that you do, go see the rest of the
world sometime.
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Posted by aemeijers on October 13, 2009, 8:24 pm
IGot2P wrote:
> Twayne wrote:
>>>>>> My detached garage with metal siding has 2x4 trusses spaced 4 feet
>>>>>> on center. Can I install a ceiling or will this be too much weight
>>>>>> and cause sagging/or other problems?
>>>>> 4' on center? What's on top of the trusses that's spanning 4'? With
>>>>> that spacing - a likely cost saving measure - it's unlikely there's
>>>>> a lot of leeway in the load handling capabilities of the roof
>>>>> framing. You'd have to frame a ceiling before you could cover it,
>>>>> and with 4' between trusses that wouldn't be easy to do with a
>>>>> light structure. The lightest ceiling I could think of would be the
>>>>> plastic corrugated roofing stuff, and that would still sag a bunch
>>>>> with 4' spacing.
>>>>> R
>>>> A hanging ceiling is very light and could likely be used. Don't know
>>>> about adding lights to it though. Check with your local code office.
>>>> No one here can tell you for sure.
>>> 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?
>> But your local code enforcement will have the final say on whatever is
>> acceptable. I'm going to guess that you're in an area where you don't
>> get snow because that method could never meet roof snow-load
>> requirements up here. So if you are in an area that gets snow, I
>> think you're in trouble before you even start. If you don't have the
>> design specs for it, you might need an engineering assessment just to
>> pass code as it is. Don't take chances because they could make you
>> tear it down.
>> And like I said, the local code office will have final say on
>> everything.
>
> You should remember that not everyone has to meet any code of that type.
> Not everyone lives the same place that you do, go see the rest of the
> world sometime.
Even if code and inspection is not an issue, code is a good place for
non-engineers to start, to know if something will probably work and be safe.
--
aem sends...
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Posted by dpb on October 13, 2009, 1:59 pm
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...
--
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Posted by DD_BobK on October 13, 2009, 3:53 pm
> 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. =A0Call 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
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>>>> on center. Can I install a ceiling or will this be too much weight
>>>> and cause sagging/or other problems?
>>> 4' on center? What's on top of the trusses that's spanning 4'? With
>>> that spacing - a likely cost saving measure - it's unlikely there's
>>> a lot of leeway in the load handling capabilities of the roof
>>> framing. You'd have to frame a ceiling before you could cover it,
>>> and with 4' between trusses that wouldn't be easy to do with a
>>> light structure. The lightest ceiling I could think of would be the
>>> plastic corrugated roofing stuff, and that would still sag a bunch
>>> with 4' spacing.
>>> R