IECC to Mandate R-60 Roofs
It is stated at https://thehtrc.com/2020/insulation-requirements-2021-iecc that the new (2021) IECC code will call for at least R-60 worth of insulation for zone 5 roofs, with comparable changes for other zones and structural elements.
Can anyone in this forum comment on this claim?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part