Cathedral Roof Assembly Options
Hello, and thank you in advance for you input. I am an architect working in NYS, Zone 6 on a new construction addition to a house. We are working on insulated roof assemblies (finished and unfinished) and I have 2 assembly options that I believe meet code and are sound consturction. Looking for your input to see if there are simpler ways still or if I am missing something critical that in could improve these systems.
Code wise, I am looking at:
– Table R402.1.2, Option 1 for Zone 6
– R806.5 Unvented Enclosed Rafter Assemblies including table R806.5
I am specifying Zip R for the first time. The owners used it on their existing house (this is an addition) and like it, and it is commonly used here.
Some of my thoughts are that I have allowed for drying in at least one direction, and using readily purchased materials. The unvented feels like a better assembly as it has continuous insulation, but maybe potentially more complicated and costly, requiring more parts.
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