Does this seem safe?

[Beth]

I'm in the process of building a small cabin: 12 x 22. The site slopes from front to back about 4 feet. I've used Sona Tubes: 4 feet long by 8" in diameter. I've used Simpson Strong-Tie connectors (post caps, adjustable stand-off post bases, and hurricane/seismic ties for the joists).

The joists measure 2 x 6 x 12 and are positioned every 16" and span 10'. The joists cantiliver the beams by less than 2'.

I've added some bracing for stability.

My question is: would an engineer be frightened by this? If so, any recommendations for improving the structure's foundation?

I plan on building walls a little over 6' and putting on a metal roof. :shock:

[Rich]

It would probably make some engineers wince a little. Probably your biggest problem here will be the shear value, or lack of, from the front to the back of your structure. You may be able to stiffen it quite a bit by running diaganol bracing from the top corner of your framing to the bottom of the posts in both directions.
After that I would just worry about it actually running down the hill if it shifts at all :)

[Armat]

First just curious why you started from the ceiling or roof joints first.Well it does not matter now it's there.I am not an engineer but I would dig around the structure where the walls are going to be and if possible cement filled for foundation.I would also level the slope.From there the walls are easy.

[Rich]

:) I think those are the floor joists Armat.

[mjpliv]

I just noticed this post. Are you sure that the local building officials will allow a 2 foot cantilever with 2x6 joists? What does the cantilever support (ie - walls loads, second storey or roof loads)? You say the joists span 10 feet. Does this include the cantilever (normally the span indicates the distance from bearing point to bearing point)?

Ideally you would not cantilever a 2x6 joist nore than 10-12 inches under normal residential loads where that cantilever supports roof loads. It would be 16 inches for 2x8 joists and 2 feet for 2x10 joists.

[myvalk]

the cant. up here can not be more than 1/3 of the legnth of the joist, so 2' seems ok.
as for making stronger, reduce the span by attaching angled 2x members from the posts to the joist. any reduction of span will help.

[mjpliv]

Something doesn't sound right about the 1/3 cant. Is this under any load condition? Regardless what is supported by the end of the cant? Can someone else in the forum confirm this is allowed?

If this was simply a cantilevered deckI would not ask these questions but as I understand this topic, you plan to build a structure on top of it.

[myvalk]

its very well i may be wrong .. going from memory from past building days. but as i remember it, if you have an 18' floor joist, you cant cant. it more than 6'. but as i write this ,... it does seem wrong, doesnt it?