Has anyone used radiant barrier sheathing for a cold roof?
We are adding a cold roof to prevent ice dams on a old house in Wilson, Wyoming. The air gap will be 2.5″ or 3.5″ using 2x3s or 2x4s on edge 16″ O.C. on top of the existing sheathing.
Would we benefit from a radiant barrier using foil faced new sheathing above the air gap?
In theory, the foil would reflect radiant heat back to the existing roof in the winter and reduce the emission of radiant heat into the house in the summer. We have second story rooms that get very hot because they have low ceilings under a shed dormer with no attic.
Sheathing such as LP Techshield is manufactured with vapor vents to allow moisture to escape.
Any suggestions and/or references would be greatly appreciated.
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