We need to know the MVG. The saying in the industry is to insulate it tight and ventilate right. This make for a healthy home environment. We cannot do that until we perform MVG calculation as we will not know what ventilate right equals to in this home. When we talk about MVR it is often referenced to ASHRAE 6.22 the industry accepted standard this guide is the 1989 version which is still used for Energy Upgrade California
