InstantForum.NET v4.1.2Decks.comhttp://www.decks.com/support@decks.comSat, 07 Nov 2009 16:29:52 GMT20http://www.decks.com/Topic1823-21-1.aspxHi basnc, thanks for your question. I think you are building strong enough for the spa based on your description. It is important not to under build considering all the weight bearing on the deck from the spa.</P><P>ThanksThu, 06 Jul 2006 06:44:01 GMTAndersonProCarpentryhttp://www.decks.com/Topic1823-21-1.aspxHave a 12'X12' deck in North Carolina. After reading some of these posts, now I'm wondering if it is sturdy enough for our forth-coming spa (spa is 350 gal, measures 91"X91" - needs 100 PSF decking - weight is 3560 lbs (less people and decking)).</P><P>Free standing deck, any case, have nine 6"X6" posts 36" in a 12" concrete hole. Deck has one foot of overhang all around. Top of deck is like 24 inches off ground. Doubled up 2"X10"X12' beams and notched those on the 6X6 posts. Thus, have three of these base beams - with like 60" spacing between 6X6 beams. Then have 2"X10"X12' floor joists with 16" OC (doubled up every other joist under the spa area (so I have three sets of doubled up floor joists). Decking is 5/4". I'm not on the coast so I don't have huricane worries.</P><P>Does this sound like it will be sturdy enough?</P><P>Thanks,Wed, 05 Jul 2006 16:46:14 GMTbasnc