Building Homes or Extensions/18 foot clearspan

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Expert: - 7/27/2009


Question
I am looking to remove a 13' load bearing wall that currently has a standard (36") cased opening on each end. This will make my total opening 19', ceiling joists are 2X6s. Can I use a triple 2X8X20' for the beam or would I be better off with a flitch beam? if so, how do I build a flitch beam?

Thanks.

Answer
Flynn, I don't think the triple 2x8 is remotely large enough for that kind of span.  I am pretty sure it will sag from its own weight. I am not a structureal engineer but here is some information on flitch beams:
http://www.toolbase.org/Design-Construction-Guides/Exterior-Walls/flitch-plate-b...

YOu might also look into LVL or steel.  In fact, a metal stud built up beam might be best.  Sorry I can't help more, but 20' is beyond "seat of the pants" engineering and "rule of thumb".

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Dan Griffin

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I can answer almost all questions related to the total construction process. My expertise is in commercial construction, though I can field most any residential question. I have hands on experience in concrete, heavy equipment, masonry, all phases of carpentry, interior finishes, and I am fairly strong in mechanical and electrical.

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