Create A Ceiling Vault In Existing Rafter Roof

Question: 

Is it possible to retrofit a standard rafter/joist style roof to a scissors truss configuration without replacing the existing construction?

Answer: 

It sounds like what you are proposing is not necessarily to make a scissors truss from conventional framing but to vault the ceiling joists. This is certainly an option but we recommend consulting a structural engineer for this project.

An alternative is to use scissors trusses, which would replace the existing roof framing.

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