Many people often ask us “If I could only do one blower door test – which would you prefer before or after the drywall goes on?” I always say;
“Take Manny and Anderson’s awesome build as an example. The pre-drywall test, which came in at a wonderful 1.4 Air Changes per Hour (ACH) caught a number of crucial air leaks and because the drywall was off, we were able to not only identify but to do something about the air leaks!”
But I digress, check out this vid: