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Can a house have no load bearing walls?

A: You can build a multi-story home with no bearing walls. It's been done for decades. Amazingly, it's done using regular 2-by-4s to solve the problem.

dispatch.com - Ask the Builder: Home can be built without load-bearing walls

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Tim Carter Tribune Content Agency

Q: Is it possible to build a multi-story home with no, or few, interior bearing walls or beams? I've looked at lumber span tables and regular lumber doesn't seem to be able to do what I want to be done. What are my options, and have you ever solved this problem before?

A: You can build a multi-story home with no bearing walls. It's been done for decades. Amazingly, it's done using regular 2-by-4s to solve the problem. No, that's not a typo. Let's first discuss the span tables. A span table is a chart that shows how far a certain floor joist can span and not bend too much depending on several factors. The wood species, the grade of the lumber, and the height or size of the floor joist are the primary elements taken into consideration when creating the tables. It's important to realize that different species of lumber have different strength characteristics. When I was building every day, Douglas fir was one of the strongest types of lumber you could buy. Southern Yellow Pine was also very strong. Hemlock, on the other hand, was somewhat weak. Decades ago, I used floor trusses made with ordinary 2-by-4s to create the floor of a large room addition for a client. He refused to have any interior load-bearing walls or beams and also wanted a floor that was as solid as concrete with no bounce in it. Magic floor trusses solve problems such as these and offer much more to architects, builders and homeowners. A floor truss is made in a factory where common roof trusses are made. Advanced computer technology designs the exact size and shape of the truss to meet whatever specifications you require. The result is a wood floor truss that looks much like large steel bridges that span rivers and canyons. I'm sure you've seen hundreds of these where the horizontal top and bottom members of the bridge are connected by numerous other pieces of steel that look like a bunch of connected letter Ws one after another along the side of the bridge. This design can be done with steel, 2-by-4s and even toothpicks for class science projects! Plumbing, heating and cooling, and electrical contractors love working with floor trusses. They have virtually unlimited places to run pipes, ducts and cables, never having to drill one hole. The center of each floor truss almost always has a wide-open chase for a heating or cooling contractor to install his primary supply ducting down the center of the floor from one end to the other. A floor truss can be designed to span 30 or more feet with ease. The truss manufacturer can build them so strong that there's no bounce to the floor at all. This comes in handy if you desire a tile floor. Tile and grout can crack if installed over wood floors that are springy and bouncy. Two or three carpenters can easily move around these giant floor trusses. You don't need to have a large crane on a job site to set them. Each truss is an identical copy of the one next to it so the finished floor is flat and smooth with no humps or dips in it. These imperfections are quite common with normal dimensional lumber floor joists. Tim Carter writes for the Tribune Content Agency. You can visit his website (www.askthebuilder.com) to see an example of the topics mentioned.

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