The moisture and temperature limitations of some air barriers can each be problematic enough on their own. But the combination of the two, can wreak havoc a construction schedule.
Percentage of days with either 0.1" of precipitation or temperatures below 40°F in the past year.
We looked at data from across the country to see how many days out of the year have either 0.1" of precipitation or has a temperature that reaches 40°F or lower (see below on why that temperature limit is important). Here is what it looks like from throughout the Rocky Mountain region.
Many air barriers like this acrylic emulsion air barrier state that the product should not be applied when temperatures are below 40°F.
Percentage of days with temperatures below 40° in the past year
Traditional air barrier chemistry, like acrylic emulsion technology, is made to keep water out when fully cured. But any introduction of moisture into the process before the air barrier is fully cured can cause lots of problems. Here is a common statement from acrylic emulsion air barrier literature stating that not only can they not be installed in wet conditions but cannot be installed if there is a chance of rain in the forecast. If it does happen to rain within the 16-hour window listed on the technical data sheet below, the air barrier can literally wash right off the wall.
PROSOCO's FastFlash system is a complete, monolithic building envelope system that can be applied in damp conditions and it is immediately waterproof so it can withstand rain right after application.
Percentage of days with at least 0.1" of precipitation in the past year
Watch out for air barriers that can only be applied on a dry substrates. In reality, if an air barrier can only be applied in dry weather conditions to completely dry substrates, you may have to wait several days or even several weeks to make sure everything the substrates are dry, current conditions are dry and the forecast is dry as well.
PROSOCO's Fast Flash system is a complete, monolithic building envelope system that can be applied in damp conditions and it is immediately waterproof so it can withstand rain right after application.
All the data we analyzed shows that the combination of temperature and moisture limitations of many air barriers can add up to big problems.