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Posted by Scout on July 31, 2006, 4:19 pm
Thanks for your response. I will be looking into the idea of adding
scissors trusses over the top. There is a local truss building company
that's going to come in and let me know if it's feasible. Thanks for
pointing me in a new direction.
marson wrote:
> Scout wrote:
> > Hi Everyone,
> >
> > I've just purchased a new home with a mansard roof which is pretty
> > ugly. I'm looking for an economical way of creating a gable roof over
> > the top of the mansard roof without removing the old roofing. Can I
> > build a new rafter system over the top of this one. At the same time,
> > I will remove the side part(the mansard) and replace with siding. If
> > this is feasible, how do I tie the new ridge board and rafters securely
> > to the new roof.
>
> rafters and ridge board really don't meet code to my knowledge. where
> rafters are used (rather than trusses) typically you will find a
> structural ridge, which is a beam supported by posts. this would have
> to be engineered (which could be done by the company that sells the
> beam). this would be a lot of trouble to retrofit since you would need
> to tear into your exterior walls down to the foundation as well as
> likely find an interior point down to a new footing.. if the mansard
> has a low slope, it might be possible to get a scissor truss to sit
> over the whole works (i'm just shooting from the hip here). otherwise
> you are looking at ripping the whole roof off and replacing it. no
> small matter.
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