cantilevered balcony

[banjo007]

I'm replacing the roof on my 19' x 21' garage with gambrel attic trusses. I'm putting a door on the rear for a deck and stairs. I'd like to put a door on the front and add a short cantilevered balcony. The cantilevered boards would run perpendicular to the truss joists. They would rest on the garage header and under the trusses. I would like the balcony to extend 4'. Is this feasible?

 

[p_mori7]

Cantilever means that the joists supporting the balcony run further back into the structure than what sticks out beyond the wall. Normally these joists would run in the same direction as floor joists or bottom chords of the trusses.

It reads like you are going to lag bolt into the header or some other type of mechanical fastening. Therefore the outer corners of your balcony would need to be supported back to the garage structure with angled support posts, or supported vertically down to a concrete piling that is as stable as the garage foundation itself (to avoid heaving).

 

[bczygan]

I'm replacing the roof on my 19' x 21' garage with gambrel attic trusses. I'm putting a door on the rear for a deck and stairs. I'd like to put a door on the front and add a short cantilevered balcony. The cantilevered boards would run perpendicular to the truss joists. They would rest on the garage header and under the trusses. I would like the balcony to extend 4'. Is this feasible?

Yes.

Needs to be engineered.

 

[fury9]

If you go out 4' you have to go back in 8', don't know about setting this up with trusses though

 

[boobag]

If you go out 4' you have to go back in 8', don't know about setting this up with trusses though

this is the case for floor joists, but attaching to trusses is a whole other deal i'd imagine.

 

[matt_i]

One of the biggest issues is that you can't just extend SPF framing members out of the building and expect them to last in a deck/outdoor environment. That would leave a very large problem for down the road.

Alternatives are steel or pressure treated but the length of inner extension and the fastening method isn't trivial.

 

[Alan Douglas]

Keeping water from wicking back into the building won't be as easy as it looks.

 

[MoonRise]

I'm replacing the roof on my 19' x 21' garage with gambrel attic trusses. I'm putting a door on the rear for a deck and stairs. I'd like to put a door on the front and add a short cantilevered balcony. The cantilevered boards would run perpendicular to the truss joists. They would rest on the garage header and under the trusses. I would like the balcony to extend 4'. Is this feasible?

Feasible?

Yes. With engineering design and stamped drawings for the design.

Note: It is not as simple as just running some cantilevered deck joists under the truss and out into the air. Hence the engineering requirement.

 

[rsanter]

Yes it can be.
Yes it will be expensive

Bob

 

[Cyberbear]

Old Rule of thumb was 1/3 for porch/deck and 2/3 for leveraged support. Resting on the header is a good idea if it can adequately support it's usual load and the weight of the extension for materials and live load for people.
If you incorporated the correct size beams and reinforced the bottom truss stringer and used Simpson ties for strength, you could possibly do this. I imagine as with most building departments, wanting to accept no liability, you'd need an engineer's stamp on a set of drawings. Beware of liability issues w/o approval.

 

[theoldwizard1]

Are we talking a balcony the people are going to stand on or a roof to shield the doorway from precipitation ? If people are going to stand on it, forget cantilever.

Doing ANY MODIFICATION to the bottom chord (or any chord for that mater) of a truss, including adding any kind of load, need to be approved by the company that engineered the truss.

 

[Slednut]

Here's what I did on my recent addition. 2x12x12s on 16 inch centers making up a 4 foot deck.

 

[Chris705]

Slednut - post a photo of the inside framing so OP can see the extent of how far inside framing extends.