Okay, you've convinced me that a SIPs roof is a good way to go.  It is clear that SIPs make a lot of sense in a cathedral ceiling. 

However, how are SIPs detailed when the ceiling isn't going to be a cathedral ceiling?  I.E.  The roof has the insulation and you have to add a ceiling for the bedrooms, bathrooms, etc.  Or do you use the SIPs installed flat for the ceilings and use trusses to build a roof over that?

I'd just go to my local truss company to get trusses for a conventional roof, or check the code for sizing for a stick built roof.  Where do I go to get the design details for a SIPs roof?  Is my only option a local engineer?  Doesn't that get expensive? 

Thanks,

Bruce

tb;

picture of dropped ceiling in steel, but same for wood

Simon and  Chris,

The drawings and pictures cleared that detail up nicely.

Does the SIPs panel manufacture or distributor provide details for the roof?  If not, where would I get the details?

Thank you,

Bruce