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Posted by stryped on July 30, 2008, 9:02 am
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I am wanting to build a 24x30 pole barn garage. (Runnign out of room).
If I use a 5/12 pitch roof, what is the length of the other side? (I
am trying to determine the survae area of the roof to see if roofing
metal or shingles would be cheaper. I can get metal for 3 dollars a
foot.
Also, instead of purchasing trusses, could I just make a 2x4 ridge
board and run 2x4 rafters down from that?
Thanks!
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Posted by Lloyd E. Sponenburgh on July 30, 2008, 9:40 am
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4792-9da9-2bf5cecf9cf4@m44g2000hsc.googlegroups.com:
> I am wanting to build a 24x30 pole barn garage. (Runnign out of room).
> If I use a 5/12 pitch roof, what is the length of the other side? (I
> am trying to determine the survae area of the roof to see if roofing
> metal or shingles would be cheaper. I can get metal for 3 dollars a
> foot.
>
> Also, instead of purchasing trusses, could I just make a 2x4 ridge
> board and run 2x4 rafters down from that?
>
> Thanks!
>
5-in-12 is 13 feet on the slope. Add about 12" either end for overhang,
if you want it, and rake-end eaves of 12".
So, your 24x30 barn is really 32' long, and the slopes are 14'. With
standard 5-vee tin (24" wide), that's 32 14' sheets. For standing-rib
galvalume (36" wide), it's 22 sheets, and the rake-end eaves need to be
18" instead of 12" to make it all work out without cutting.
sqrt(rise^2 + run^2) = sqrt(5^2+12^2) = sqrt(25+144) = sqrt(169) = 13
Pythagorean Theorem.
However, any framing square has the math "built in", as it were. Just
strike a line from 5" on one leg to 12" on the other (or 10 and 24), and
measure the line you made. (13 or 26).
LLoyd
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Posted by Lloyd E. Sponenburgh on July 30, 2008, 9:45 am
Please log in for more thread options 4792-9da9-2bf5cecf9cf4@m44g2000hsc.googlegroups.com:
> Also, instead of purchasing trusses, could I just make a 2x4 ridge
> board and run 2x4 rafters down from that?
Forgot to answer that part:
You can, but you need collar ties between the rim beams to hold the ridge
up (think "ceiling rafters"). Remember that a ridge board doesn't hold
_anything_ up unless it's on center-posts, it is _held_up_ by the
rafters, which, if allowed to spread at the walls, will sag. Ridge
boards are just convenient nailing surfaces for the rafter tops, and a
way to longitudinally brace the rafters at the same time.
For that small a job, I'd be tempted to make up my own trusses with
gusset-glue-n-nail. They're not code anywhere anymore, but simple to
make, and plenty strong enough for a simple pole barn.
By the time you get a ridge board and all those collar ties in place,
you'd have spent more than for trusses.
LLoyd
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Posted by stryped on July 30, 2008, 10:07 am
Please log in for more thread options On Jul 30, 8:45=A0am, "Lloyd E. Sponenburgh"
<lloydspinsidemindspring.com> wrote:
> 4792-9da9-2bf5cecf9...@m44g2000hsc.googlegroups.com:
>
> > Also, instead of purchasing trusses, could I just make a 2x4 ridge
> > board and run 2x4 rafters down from that?
>
> Forgot to answer that part:
>
> You can, but you need collar ties between the rim beams to hold the ridge
> up (think "ceiling rafters"). =A0Remember that a ridge board doesn't hold
> _anything_ up unless it's on center-posts, it is _held_up_ by the
> rafters, which, if allowed to spread at the walls, will sag. =A0Ridge
> boards are just convenient nailing surfaces for the rafter tops, and a
> way to longitudinally brace the rafters at the same time.
>
> For that small a job, I'd be tempted to make up my own trusses with
> gusset-glue-n-nail. =A0They're not code anywhere anymore, but simple to
> make, and plenty strong enough for a simple pole barn.
>
> By the time you get a ridge board and all those collar ties in place,
> you'd have spent more than for trusses.
>
> LLoyd
How would i go about making my own trusses like that?
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Posted by Lloyd E. Sponenburgh on July 30, 2008, 11:16 am
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> On Jul 30, 8:45 am, "Lloyd E. Sponenburgh"
> <lloydspinsidemindspring.com> wrote:
>> news:80401bcf-e992-
>> 4792-9da9-2bf5cecf9...@m44g2000hsc.googlegroups.com:
>>
>> > Also, instead of purchasing trusses, could I just make a 2x4 ridge
>> > board and run 2x4 rafters down from that?
>>
>> Forgot to answer that part:
>>
>> You can, but you need collar ties between the rim beams to hold the
>> ridge up (think "ceiling rafters"). Remember that a ridge board
>> doesn't hold _anything_ up unless it's on center-posts, it is
>> _held_up_ by the rafters, which, if allowed to spread at the walls,
>> will sag. Ridge boards are just convenient nailing surfaces for the
>> rafter tops, and a way to longitudinally brace the rafters at the
>> same time.
>>
>> For that small a job, I'd be tempted to make up my own trusses with
>> gusset-glue-n-nail. They're not code anywhere anymore, but simple to
>> make, and plenty strong enough for a simple pole barn.
>>
>> By the time you get a ridge board and all those collar ties in place,
>> you'd have spent more than for trusses.
>>
>> LLoyd
>
> How would i go about making my own trusses like that?
>
If you're going to have a slab in the barn, it's extra-easy. You just
build a jig on the floor, and assemble them one-at-a-time; then stack 'em
up outside until you get them all built.
Standard truss designs for that short a span are all over the web. A
quick search will turn up several. If that doesn't satisfy, get a book,
or buy ONE truss from a truss yard that has some leftovers, and copy it.
Or just buy unclaimed trusses of WHATEVER length they happen to have
lying around, and re-plan your barn size accordingly. That's a popular
option with pole barn builders, and leftovers can usually be had cheaply.
LLoyd
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> If I use a 5/12 pitch roof, what is the length of the other side? (I
> am trying to determine the survae area of the roof to see if roofing
> metal or shingles would be cheaper. I can get metal for 3 dollars a
> foot.
>
> Also, instead of purchasing trusses, could I just make a 2x4 ridge
> board and run 2x4 rafters down from that?
>
> Thanks!
>