Good point, Sirius. Here's the plan (literally): My current deck has 6 in. pilings. The new deck has 8 in. square pilings... actually they are 8.5 inch. Concrete footers are to be poured, going down 5 feet, and there is rebar tapped through each piling, 4 feet down. The county inspector has already indicated he will be looking to see there are holes going down below the rebar before we pour. The concrete piling could have a tornado hit it without moving..... we pounded it down in sand.
So the deck will not move..... for sure won't be moving two inches to hit the piling..... impossible. There are many nights where the wind shuts off once the sun goes down. However, there are also nights where some kind of front came through, and there can be some real wind. I'm hoping on those nights I could position the POD dome to block the wind.
When the crane installed the wood pilings for deck, we did not immediately pour concrete, we just backfilled. We had some high wind nights, where those wood pilings were moving all over the place. Now the framer has installed most of the deck framing up top, and he still has to install mezzanine half way up. The wood pilings were augured 8 ft. down, then we just backfilled. That was done in February. We backfilled to make the framer's life easier, so he could pull and twist the pilings to square things up. I already talked to a kid in the neighborhood who wants to dig out around the pilings at $ 10 per hour, then I just need a concrete guy to pour the concrete (labor only, I'll buy the concrete).
The engineer who designed my deck I've used previously to build three different buildings..... he way, way overbuilds. It really runs the cost up.
I have imaged in the past on my current deck, with 6 inch pilings, no concrete. I never knew I had movement until I tried using my Skyris video camera, looking at the moon in live mode. Once I saw that, I knew if I wanted to do some imaging 20 ft. up in the air, I had better figure going with an isolated concrete house piling.
I have been told that the POD has a bunch of screw-down holes that take 1/2 in. bolts. So I will put 1/2 in. bolts through the decking boards, and through some 2 x 10 blocking under the decking boards, blocked off to the 2 x 10 joists. I'll attach the blocking with hurricane clips or aluminum angle iron with screws to the joists.
Wind is another reason I'm going with a dome, instead of a roll-off shed. I think the dome would be more streamlined in time of hurricane..... and I liked their famous "Redneck Wind Test" on top of the pickup. I also think that in my case, a dome would look better than a square shed.
Edited by Bigdan, 21 March 2016 - 07:56 PM.