Can you use polyiso insulation on the exterior of a wall behind cedar siding on the west coast?

Iain Matheson
Updated: Sept. 9, 2020

At what point/temp & to what extent does polyiso board loose its thermal properties?  Does it go below R4.5 per inch?  Is it usless at -15C ?  or equal to XPS  ?

Responses (2)

Sarah Nicole 3 years ago

Piggybacking on this thread, would you, Mike, have any suggestions for how to minimize rockwool particles from becoming loose / airborne from van movement? What are your thoughts on wool or thinsulate instead?