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removing outdated comment about the question's hold
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BMitch
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Now that the hold has been removed, I'll post my original comment as the answer I wanted to post initially 3 days ago but could not due to the hold:

Last time I checked, polyisocyanurate has the best insulation value per inch (R-6.5) of all the conventional building insulation products, and it is available in 1/2" sheets.

Now that the hold has been removed, I'll post my original comment as the answer I wanted to post initially 3 days ago but could not due to the hold:

Last time I checked, polyisocyanurate has the best insulation value per inch (R-6.5) of all the conventional building insulation products, and it is available in 1/2" sheets.

Last time I checked, polyisocyanurate has the best insulation value per inch (R-6.5) of all the conventional building insulation products, and it is available in 1/2" sheets.

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bcworkz
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Now that the hold has been removed, I'll post my original comment as the answer I wanted to post initially 3 days ago but could not due to the hold:

Last time I checked, polyisocyanurate has the best insulation value per inch (R-6.5) of all the conventional building insulation products, and it is available in 1/2" sheets.