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Question DetailsAsked on 7/21/2016

4"x12"x21' wood beam with 3/8" steel two sided bolt wrap strenght

Beam now has post at center of 21' run , I want to remove post . The beam is 4' out from exterior wall with a 44" over hang to gutter. The roof system is 2x4 truss. I want to wrap the beam with 3/8" steel two sides an thru bolt. Then remove the post .

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2 Answers

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You need a Structural Engineer (your Search the List category) to look at the current design and loads and what can be done - both with respect to load carrying capacity, lateral buckling stability, and bolting or nailing pattern needed for any coverplates or plywood supplements or whatever works best. Cost probably around $300-500 depending on difficulty of determining current loads on it and getting accurate measurements of various elements bearing on it.

Also to be considered - since you said at least part of beamm (maybe all - I am not clear on that) is outside - MAJOR consideration of water protection, because an exposed wood beam can dry out after wettings, but put metal plates on it and you are trapping water and cause rot under the plates - SOOOO many highway and recreation and parks designers have found this out the hard way with pretty wood bridges built outside that start rotting in just a year or few, especially if untreated wood as your beam likely is. Of course, risk of it getting wet with any frequency is a mjaor factor in the design.

Consider also the simple matter of getting it up there, if looking at DIY - because you are looking at about 320# per plate - and yes, in almost all cases like this plates will have to be single-piece and continuous. One reason plywood is commonly used if not in exterior or damp location.

Answered 2 years ago by LCD

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Answered 2 years ago by Member Services




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