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yam2006_gw

Question about Hardie siding and foam board

yam2006
17 years ago

I'm getting some estimates for Hardie siding installation. My house currently has 25 year old foam board beneath hardboard siding.

One of the contractors advised that I remove the foam board entirely, and replace it with osb to match the original wall thickness for doors and windows. He says that Hardie does not install as well over foam board, and that the foam board has very little R-value anyway. This seems like a mistake to me, but I'm not a pro. Please advise? I want to have as good of insulation as possible, but I don't want any problems with the Hardie siding installation.

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