So I have roughly r14 on my exterior walls through exterior insulation. My plan was to use rockwool in the wall cavities. I&#;ve always felt it&#;s a superior product for insulating but I&#;m wondering if at the added cost it&#;s really worth it if I&#;m already using exterior insulation and a really good wrb. The piece is about 40% more in my area. It has a very modest gain in r value but I do like some of the other properties. Also add to the fact next to no one in my area wants to do it so that leaves me too which pushes my schedule back further.
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Most of my quotes have been around 10k for fiberglass and 16k for rockwool.
The question is for wall cavity insulation is rockwool justifiable at a 50% or more markup. Especially with the added benefit of all the exterior insulation.
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I&#;m having a hard time justifying the increase in cost any thoughts here are appreciated.
Thanks, Tom
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