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I am planning to build a new house in St. Louis using as many green (environmentally friendly), renewable, energy efficient technologies as practical, such as AMVIC ICF (Insulated Concrete Forms) up to the soffit-line, steel-stud interior walls and rafters, BioBase soy foam insulation applied directly to the underside of a steel roof (leaning towards Gerrard).
In reading some of the other insulation/ventilation Q&A's, I see that I may be on the right track with the foam insulation, but I still have some specific questions:
1) Can I have the steel roof attached directly to the steel rafters (at a 10-12 pitch) in a cathedral ceiling (using logs to create an open truss system) with drywall attached to the underside of the rafters and the soy foam applied to the undersurface of the steel roof between the rafters.
2) How much (if any) ventilation space should I leave and where?
Or copy this URL:
https://www.metalroofing.com/spirit/comment/6347/find/
Your question concening installation of the Gerard product direct to lathe, etc. must be answered by Gerard. I do not have intimate knowledge of the testing and code listings they have on their product. It also depends upon which of their products you choose.
Regarding the ventilation space, the International Building Code requires a minimum vented air space of 1" alongside the bottom of every roof assembly.
7/28/2005
Or copy this URL: https://www.metalroofing.com/spirit/comment/6347/find/Isaiah Industries, Inc.
7/29/2005
Or copy this URL: https://www.metalroofing.com/spirit/comment/6348/find/