The top three causes of building failure are water, moisture, and humidity. Not only does the water itself cause damage but so too does the mold that takes root in moist, warm, dark, and under-ventilated places. The perfect example of this type of space is an unsealed, unconditioned crawlspace. Take a look at what E3 INNOVATE found this past September. Moisture levels in this crawlspace were out of control and resulted in complete destruction!  Poor air sealing and a humid summer had everything to do with this situation.