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Reframe trussed space as conventional without tearing down structure?

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Reframe trussed space as conventional without tearing down structure? smcjensen 11-22-2006
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Posted by smcjensen on November 22, 2006, 9:55 pm


I have space over a garage I'd like to convert to a 4th bedroom for an
upcoming child. The space is trussed and I was thinking of sistering
conventional framing beside all the trusses then cutting the obstrucing
portions of the trusses out. I don't want to tear down the entire
garage and throw away a perfectly good roof and siding and I don't want
to disrupt the neighborhood with a month's worth of torn up house. The
roof line is a simple A frame. I've built another addition on my house
after which the building inspector said I did a very good job so I'm
not a complete novice. The real question: is this idea crazy stupid
or has it been done before?


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Posted by Goedjn on November 22, 2006, 10:13 pm


wrote:

>I have space over a garage I'd like to convert to a 4th bedroom for an
>upcoming child. The space is trussed and I was thinking of sistering
>conventional framing beside all the trusses then cutting the obstrucing
>portions of the trusses out. I don't want to tear down the entire
>garage and throw away a perfectly good roof and siding and I don't want
>to disrupt the neighborhood with a month's worth of torn up house. The
>roof line is a simple A frame. I've built another addition on my house
>after which the building inspector said I did a very good job so I'm
>not a complete novice. The real question: is this idea crazy stupid
>or has it been done before?


Just remember that the truss does two things, it holds the
roof deck up, and it keeps the walls that the roof rests on from
coming apart. As long as you replace BOTH those functions
(joists and rafters) you should be ok.

Is the garage door in the gable end, or one of the load bearing
walls? 'Cause if your new rafters rest on the wall with the
door in it, you'd best make sure that whatever beam goes across
there is sized to take half the floor.

Posted by Harry K on November 22, 2006, 10:20 pm



smcjensen wrote:
> I have space over a garage I'd like to convert to a 4th bedroom for an
> upcoming child. The space is trussed and I was thinking of sistering
> conventional framing beside all the trusses then cutting the obstrucing
> portions of the trusses out. I don't want to tear down the entire
> garage and throw away a perfectly good roof and siding and I don't want
> to disrupt the neighborhood with a month's worth of torn up house. The
> roof line is a simple A frame. I've built another addition on my house
> after which the building inspector said I did a very good job so I'm
> not a complete novice. The real question: is this idea crazy stupid
> or has it been done before?

(Scratching head) It sounds weird at first but I can see it working
with some problems.

Fastening the joists and rafters to the sill plates would be a problem
due to nailing room. I wouldn't trust just sistering to the bottom/top
chords of the trusses but it might work.

Your framing lumber would have to be much larger than the truss sizes.


Harry K


Posted by Joseph Meehan on November 23, 2006, 7:29 am


smcjensen wrote:
> I have space over a garage I'd like to convert to a 4th bedroom for an
> upcoming child. The space is trussed and I was thinking of sistering
> conventional framing beside all the trusses then cutting the
> obstrucing portions of the trusses out. I don't want to tear down
> the entire garage and throw away a perfectly good roof and siding and
> I don't want to disrupt the neighborhood with a month's worth of torn
> up house. The roof line is a simple A frame. I've built another
> addition on my house after which the building inspector said I did a
> very good job so I'm not a complete novice. The real question: is
> this idea crazy stupid or has it been done before?

Trusses are funny things. I strongly suggest you get a real structural
engineer to take a look at the situation and make a recommendation. You are
going to need to resize the structural units and make sure they are large
enough. With trusses it is not easy to judge since they are complex units
that relay on each other for strength.

--
Joseph Meehan

Dia 's Muire duit




Posted by marson on November 23, 2006, 8:17 am



Joseph Meehan wrote:
> smcjensen wrote:
> > I have space over a garage I'd like to convert to a 4th bedroom for an
> > upcoming child. The space is trussed and I was thinking of sistering
> > conventional framing beside all the trusses then cutting the
> > obstrucing portions of the trusses out. I don't want to tear down
> > the entire garage and throw away a perfectly good roof and siding and
> > I don't want to disrupt the neighborhood with a month's worth of torn
> > up house. The roof line is a simple A frame. I've built another
> > addition on my house after which the building inspector said I did a
> > very good job so I'm not a complete novice. The real question: is
> > this idea crazy stupid or has it been done before?
>
> Trusses are funny things. I strongly suggest you get a real structural
> engineer to take a look at the situation and make a recommendation. You are
> going to need to resize the structural units and make sure they are large
> enough. With trusses it is not easy to judge since they are complex units
> that relay on each other for strength.
>
> --
> I agree that you need to have a structural engineer look at this. I'm
skeptical that it would work without a structural ridge beam, which would add a
layer of complexity to your plan. Could be done, but it wouldn't be a cake walk.



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