06:40PM | 04/13/04
Member Since: 04/12/04
1 lifetime posts
I plan to build a shade structure over my deck, and wish to keep the deck open; i.e. I wish to use posts only at the edges.

The problem is that I have a rather large span to cross:

23 foot Joist Span.

8 foot Beam Span.

6x6 Posts (10 foot high).

To top it off, it might hold a little snow.

Assuming worst case, I attempted to use the deck tables; however, the Beam Size table doesn't support these large sizes.

How do I go about caclulating the required material?

How about alternatives? I would consider aluminum I-Beams, but I'm not sure where to start with this.

Any help would be appreciated.



06:19AM | 10/12/06
Member Since: 06/19/06
26 lifetime posts
Our support can answer your issures

205 368-7226 or visit our website below

Good luck


Screen room | Garden room | Outdoor room | | Do-it- Yourself


06:40PM | 03/13/07
Member Since: 03/12/07
1 lifetime posts
I have pretty much the same question. My deck is 14ftx12ft & I don't want a post in the center of my deck either. I was thinking steel but afraid of the look. My dad(not an engineer) suggested sandwiching plywood between two 2x8's for strengh & to prevent sagging. Maybe a 1/4"steel plate w/ bolt holes every 2ft instead of plywood would be even better & still keep the wood look. Let me know if you have found a solution to your problem.


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