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Posted by No on June 5, 2006, 9:58 pm
JD wrote:
> I want to build a pergola over my deck and don't want any posts in the
> middle of the deck. The deck is 22 ft wide and 12 feet deep. Because of
> the direction of the sun I will span the 12 ft depth. The 4 beams would be
> supporting 2x8 joists probably 24" oc that support 2x6 or 1x6 top pieces 12"
> oc that will shield the deck from the sun.
> On the "house side" the beams would be supported by columns or a leger board
> fastened to the brick side of the house. On the "outside of the deck" the
> beams would be supported by 8" round fiberglass columns. I am planning on
> using doubled 2x12s for the beams. One reason is for aestetics, but my
> research has indicated that this will support the weight of the joists and
> top pieces. I will be using treated southern pine. As added support, I'll
> be adding support posts under the deck near the major support columns.
> I'd appreciate your thoughts
> TIA
> JD
>
>
See
http://www.forums.woodnet.net/ubbthreads/showflat.php?Cat=&Number=2437039&page=2&view=collapsed&sb=5&o=&fpart=1&vc=1
Much large span that you are talking. 2x10 carry beam, double 2x8x20'
joists 4' OC in some sections.
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