The ‘R’ value of 5/8″ drywall is .56 as opposed to an ‘R’ value of .45 for 1/2″ drywall.
This is not a significant difference, when compared to the fiberglass insulation which should be installed in the wall initially, with an ‘R’ value of 11.0
Drywall’s thermal insulation properties are not spectacular – the main benefit is acoustic insulation, potential fire insulation and aethetic.
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