How much weight can my deck hold?


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Old 12-04-22, 04:45 PM
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How much weight can my deck hold?

2x6 joists and ledger. Ledger bolted to cinder block wall every 12 inches. Deck is 10x10. 5) 4x6 outer posts and 2) 4x4 inner posts. On top of joists are sheets of 3/4 plywood and a tile floor. Joists are 24 on center. Will my deck hold 3000 lbs and if not can I add supports so that it can?



 
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Old 12-05-22, 08:55 AM
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Depends on how the 3000 lb weight is distributed. With a 10 x10 area, a 30 lb weight per square foot is not a problem. As the weight per square foot increases, deflection issues can arise. A more important issue is cracking of the joints between the tiles if any deflection occurs.
 
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Old 12-05-22, 09:20 AM
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It sounds like you want to add a spa/hot tub. In that case your deck will need significant reinforcement. An easy way is to build a separate deck underneath supporting your existing deck where the spa will be situated. This new deck will have its own footers and posts to support the weight.

 
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Old 12-05-22, 11:51 AM
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You are dead on Dan. It's going to be a 7x5 spa. Do the new support posts have to be in the ground or can they sit on those concrete footer blocks?

I am not worried if the tile cracks. It's a screened in covered deck.

Thank you
 
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Old 08-14-23, 08:00 PM
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Circling back to this. I finally have my spa and it's 6x6ft. I added 4 more posts with 2x6 on edge against the original floor joists making the area below the tub having a total of 7 posts. The internet says 50psf with 2x6 but I can't find at what span. I would like to assume the 2x6 can support more then 50psf with a support every 2.5 feet. My footprint will be 36sqft at around 1800 lbs. Thoughts on this?
 
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Old 08-14-23, 08:53 PM
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Do the new support posts have to be in the ground or can they sit on those concrete footer blocks?
Support blocks are not really even a sound way to support a deck let alone a spa sitting on a deck. Just from the pictures that deck is not capable of supporting anything like a spa.
 
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