DON’T COMPROMISE R-VALUES!
A leaky enclosure can decrease insulation effectiveness by a factor of 4.8 – making a 500 sf leaky building require the same amount of heating as a 2,400 sf airtight building.
Source: Study by the Fraunhofer Institute for Building Physics, in Stuttgart.
MANAGE VAPOR DIFFUSION
Water intrusion from just a small air leak can be up to 90 times greater than the water that would normally diffuse through gypsum board into the enclosure.
Source: Building Science Corporation paper RR-0412: Insulations, Sheathings and Vapor Retarders.