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Posted by DanG on April 7, 2007, 10:52 pm
You will need the snow load and wind load requirement for your
area to even begin the calculations. The dead load is minimal at
10 PSF. You will also need to meet sheer wall requirements
especially if you are in a seismic zone. The depth of headers
will probably not be that bad to meet minimums. I really hate to
see garage headers, in particular, that sag over time. It is so
common on double doors. Set your design standards above the
minimal L/360.
I would look into using a continuous LVL (can be doubled in situ)
or other man made to avoid multiple headers and trimmers. You
might be able to clear span if the weight doesn't get
unmanageable. The separations between the doors could perhaps be
done with Simpson Strong wall portal system:
<http://www.strongtie.com/products/strongwall/garage-portal.html>
or the steel strong wall for sheer and load:
<http://www.strongtie.com/products/steel-strongwall/index.html?source=topnav>
--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net
> I'm helping a friend frame a garage and have a question. One
> wall (a
> wall bearing the trusses) has 3 garage doors in it. Two are 10'
> wide
> and one is 12' wide. Can someone tell me what header size to use
> or a
> resource for finding out? I have a feeling that we will have to
> use an
> engineered member, as I dont think a pair of 2X12s will do the
> trick.
> But I would appreciate some guidance.
>
> The building is 36' deep, with 1' overhang, so half a truss is
> 19'.
> The roof pitch is 10/12.
>
> Thanks in advance,
>
> - Luther
>
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