I have a 28’2″ x 22’0″ block wall with a house (summer lake cottage) that is being torn down. The initial design of the floor system is my question. I am in the finger lakes of NY so that also should be considered. The homeowner wants to add almost 2′ to the entire perimeter, keeping the same foot print. I’m thinking a (2) 11″7/8 LVL, set 4’6″ in from the block would carry the gables on the perpendicular side (changing direction of the I joists for those cantilevers). The corners would get a hip and king LVL with a Simpson bracket perpendicular and at a 45 from the main joists beams that would be 32’2″. Would the 22’0″ span that gets bumped to 26’0″ with the cantilever on each side be able to carry the roof if. What type of rim board (s) should be used and how can I accomplish the task. I am not an engineer an am hunting for better ideas
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you already know the answer. Yes, You need to consult an engineer.
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Piff, eons of expertise, throw me a bone man. Eventually I'm gonna have to get there, but I'm trying to figure it out.
What I'm asking is whether my idea is feasible. I have an alternative which will include an exterior treated paralam on two sides of the house but would like some input on the original plan before going that route.
We do cantilevers with I-joists all the time. Each manufacturer has their own specific requirements and limitations.
You could probably learn a lot from the manufacturer's literature. Just ask at the place you'll be buying them from and they'll likely give you a book. Give them your plans, and they should be willing to send them off to their supplier for a layout and design.
I'd recommend you stay local with specific engineering advice - The folks there should know your local codes and loading requirements.
I may alter the design so that I can use treated paralams on 6x6's and hip roof the entire thing if I can't get what I need from the I-Joists. I'm working on too many other things to devote all my time on the design yet, but will keep you posted as to what we come up with.