We are rebuilding a back porch that was destroyed when a 24" oak tree fell on the house. We have log home and the wall stopped the tree. Had the house not been logs, the tree would have cut it in half. The problem I'm facing is that the tree pretty much destroyed our back porch. It was not very well constructed anyway - it had a low pitch shed roof, directly buried posts that had rotted and the "ledger" board was nothing more than a 2 x 6 resting on posts touching the ground. Here's my question:
The walls of the house sit on footers and block piers. The floor joists are on footers and block foundation but not attached to the logs. I assume this was to account for future settling. This house is about 26 years old but built from logs that are about 200+ years old. The height of the logs prevents us from having a point to attach a ledger board and the flooring foundation sets back too far under the walls to attach to. Our design involves pouring 6 new concrete footings (28" x 28" x 10" min thick with rebar)then pour 12" x 12" concrete posts on top of the footings. When the footings are poured, they will have rebar extending out the top to tie the 12 x 12 posts to the footings. The new deck framing will then be attached to the 6 new posts. When we build the porch and roof framing, they will be attached to the decking and the posts nearest the wall of the house will then be tied to the walls of the house by scribing the posts and bolting them in place (the logs are hand hewn and very uneven). The porch posts will be 4 x 6" rough sawn cedar. I apoligize for being long winded, but does this seem to provide adequate pull out strength. The decking height is only about 3 feet max at one corner. All other corners are only about 2 feet. Finally, the roof will now gable into the exisiting roof. We have a permit and will have the construction inspected, but I'm trying to gather as much information as possible. I can provide additional information if needed.
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