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Boathouse Roof Framing Question

 
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Old 03-03-2019, 12:50 PM   #1
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Boathouse Roof Framing Question


I am building a boathouse roof on top of an 10'x20' existing dock. The dock is built on driven 9in wood pilings and the pilings were cut off at the joist level. The construction is exposed to a saltwater environment so needing to use stainless 316 hardware.
I am trying to figure out the best way to build the roof and attach the 6x6 roof posts to the existing pilings? Having not been able to find details addressing this connection detail i've considered the following and not sure which of these or other ideas are better. The roof is a simple hip roof with 5v crimp metal roofing.

1. Thru bolt with 3/4" dia all thread through the piling to the new 6x6 post. I'm concerned about off center loading of the piles and all transfer of load being done through the threaded rod.

2. Notch the existing pile to allow a half lap of the new post and old pile. This seems ideal if not for the existing rim joist and floor joists not blocking access without undoing critical structure to cut in the lap. Once the lap is in place then I can through bolt connection to tie it all together.

3. Build directly on top of the existing piles. This is by far the easiest but I cannot figure out an appropriate way to tie the upper and lower sections together. Even if I used some type of hardware, it would need to be stainless which can complicate.

4. Is there another way?

I know this is done all the time, its just not as common construction so I haven't been able to figure out the best connection. Any feedback is appreciated.

Larry
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