Re: What size beam do I need?
I have a friend about a mile from me whose driveway crosses a creek that makes his bridge over 30 ft long. He built it with frames from old mobile homes. It is the best and strongest DIY bridge I have ever seen. It doesn't mind any of his equipment or the 18 wheeler used to take his calves to auction.
Old mobile home frames are a good source of steel but I would be leary of any that were in a fire or that are very heavily corroded.
Pat
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