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Small Cabin Forum / Cabin Construction / acceptable cantilever distance for floor joists?
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# Posted: 18 Aug 2010 14:31


I am gearing up to build a 16' x 24' cabin. I have a question about my design for the subfloor. I plan on using 2 x 8 x 16 joists. Each joist will have a 10' span between underlying beams and then hang / cantilever 3' both sides.

I'm having trouble determining acceptable cantilever distances. I'm assuming that it depends on the weight of the wall/roof/load etc... but I'm hoping that I'm well within the acceptable distance. The cabin will be a 1 1/2 story.

Are these 3' cantilevers going to be oK?


# Posted: 18 Aug 2010 16:19

That sounds like a bit too much. In my limited experience a 1'ft cantilever is usually not a problem. Most of your wall load is going to be hanging out at the end of the 3ft cantilever. Doesn't sound secure.

Check out some of the online span calculators.

# Posted: 18 Aug 2010 23:35

In my opinion that is too much for a sub floor, if it were a deck or something that had no load bearing wall on the outer edge you could prob get away with it, If it were me I would add a beam in the middle as well as both outer edges. My Cabin is a work in progress and my foundation has three beams with my subfloor only cantilevering 6" on either side

# Posted: 19 Aug 2010 10:51

I agree with the others, it's too much. I just built a deck on my cabin and the cantilever is three feet, BUT that's a deck. Your cabin will have a lot of weight bearing on the ends of the floor joists and you need support there. My cabin is 16' wide like yours. I used full sixteen foot floor joists, but there are three beams under them; one down the middle and one on each end.

# Posted: 19 Aug 2010 15:46

Where I am, the building code limit for a cantilever supporting a load bearing wall is the depth of the joist, so only 8" in your case.

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