re: TV mounted under gazebo

Ouch, what you have there will feel like walking on a trampoline eventually.

Honestly the framing needs to be redone. Pavers are not support, at minimum it needs to be upgraded to deck blocks dug into the ground. I would go with 4x4s but that is just me.

2x4s cannot be used as joists, it would not pass inspection. I would upgrade to 2x6 joists and 16" centers.

I’m rolling with the 2x4s but spacing every 15inches. And going to put staggered blocking throughout.

Also going to do 12x12x6 squares of cement for the gazebo to mount to underneath the decking.

The structure is premade - just being out together. I paid for the deck but he is coming back to rip the boards up and add additional joisting/blocking/pavers and the cement boxes under the deck.

Are 2x4s a deal breaker?

Those changes will certainly help, but this is all still less than ideal. I don’t imagine the structure is going to be very heavy, so your footings will probably be okay, but how is all of this going to be anchored? If you’re in a storm-prone area, this thing is going to end up in Oz next time shite gets real.

Personally, I would re-build the deck properly before even thinking about putting something on top of it, but that might not be a workable option for you at this point.

There's more than just one issue. 2x4s do not provide the support required to support any amount of weight. The frame itself is maybe a couple hundred pounds. You are having 2x4s, which aren't rated for joist use, support the weight of the deck boards, a 900lb structure, and then whatever you put on top of it.

The other issue is anchoring. You should have 6 or more 4x4 posts in concrete to support the structure. Minimally, deck blocks embedded into the ground.

Not sure where you're located but 1500 is high for what is being provided. Sitting on pavers you will also battle moisture issues, especially since the ground underneath was not prepped at all. Which will further the sagging issue. You will face cupping of your deck boards due to the moisture as well.

ETA for example. A 2x4 joist on 12" centers will have structure issues if your span is longer than 5.5 feet and will only support just shy of 1k lbs.

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When you say properly, just using 2x6

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For starters, you’d either use 2x6 with a center sill and more footings— or go min. 2x8 to span the entire 12’, anchored to poured footings at the 4 corners and centers of the two 16’ spans, supporting doubled up rim joists with galvanized hangers on each joist @ 12 to 16” O/C. I’d also want any cut edges field treated with copper naphthenate or equivalent, especially since you don’t have any clearance to speak of b/w the ground and your joists.

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I’m already 1500 in with this frame etc

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I don’t want to sound too harsh, but the guy who built your deck has no business building a doghouse from what I’ve seen. The design and execution is wholly sub-standard. And I get it, you don’t want to cut your losses and have someone else come do it right. But how much was the pavilion? You’re about to compound the mistake by erecting a structure on an insufficient foundation. Pay now, or pay later. You can make cheap, fast fixes and hope for the best, or do it right and enjoy years of use.

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Getting s quote from him to redo the frame like you all have indicated.

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I hope you’re trolling.

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but I know this guy can do the job.

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We all know “this guy” is you. No worthy contractor would put together that piece of shite. And no, you can’t do the job. You clearly have no clue what you’re doing. Why don’t you leave the construction projects to us men and go play golf or something.

Alright. Redoing it all. Here’s the plan.

12x16 wood deck barely off ground
9 cement footings ~12-16in below surface, 3 rows 8 feet apart running along 16’ side and 6’ running along 12’ side. Do I sink the 4x4 in the cement footing or just attach on top of the footing with an anchor/bracket. What is best way to attach the outter boards to the posts? Bolts or I’ve seen notching. Want to make sure this is all part of the plan.

2x6x12 joists 16in off center attached with joist hangers. Wood deck screws everywhere.

Going back with same 5/4 deck boards.

Do I put the waterproof tape on top?
Do I need a center beam? If not, do I need more posts? Anything else I’m missing? Planning to attach gazebo on top of this.