嗨..这种情况提到的是在马里兰州东北部的一个故事牧场区。我目前具有由4×6暴露的梁4'o.c的非排气屋顶。通过整个房子除了在牧场的每一端的宽度的1/2上的小“拱形”部分，其中光束不易易于访问。当前在我的屋顶上的护套/绝缘是2“是原始的母婴板，所以我相信1972年。很多面板都是下垂和损坏的水。该面板是R-5，其中乙烯基屏障连接到面板下侧，这是您在房屋内看到的成品表面。I have been researching and studying this topic of vaulted /cathedral non vented roof assemblies and the right way to re roof my structure to no relief .i don’t want to stick with homasote panels after seeing how bad they have failed due to mutiple reasons. I paid a local structural engineer to give me an awnser and he wants to demo out homasote (agreed is a must)seat cut and drop in 2×12’s 24”o.c. Then 5/8 cdx sheathing with 1-2 “ ccSF sprayed under the roof sheathing then r-38 fiberglass batts in order to reach current code of r-49 with Kraft faced seal to structure .. then smart vapor retarder before drywall . Some areas inside the house arent readily accessible to execute the insulation to underside of decking. I understand his approach but 1,700 sq ft of this style installation plus demo of multiple areas of fine wood work and bringing in multiple installers for multiple bids..loss of exposed beams and just the astronomical cost to do the extensive job( I’m on a budget and don’t think I can afford this method) I’m searching still for another awnser. One recommendation from a contractor the other day was to use t&g then insulate from outside with rigid foam panel insulation . I contacted my local code office they stated 2×6 t&g will suffice or 3/4 cdx using h clips for the 4’ span between rafters .Also they stated no r value met Is necessary just” get in” what I can since it’s existing structure and built before r -values were regulated in Maryland. So my question is that does anyone think the ladder idea of t&g and the rigid foam outside will be ok opposed to what the engineer wants? And for the sandwich would t&g or 3/4 cdx directly to beams- grace water and ice (or some other smart vapor barrier) – then 4 “ of polyiso then 5/8 cdx then roofing g materials . At edges of the sandwich use spray foam to seal for air barrier. Then inside the house between rafters at top plate cut 2” polyiso to fit and spray foam to seal edges. Any input or suggestions is needed direly.