How to Prevent Mold and Mildew Growth on Your Roof and Attic

Adhesive tape and plastic sheets are great for preventing mold spores from spreading throughout the house. To clean up any accumulated water, use a wet vacuum, which will absorb the spores without releasing them into the air. Proper roof ventilation is essential for keeping the attic dry and free of mold. Most homes have a passive system that circulates air through the attic, with ventilation grilles in ceiling panels or eaves allowing outside air to enter.

This air is then heated in the attic and exits through the vents of the cans or ridges due to the heat increase. This process creates a well-ventilated space and prevents moisture and heat from being trapped. A shingle protector is a strip of metal made of 99% zinc. When installed on the roof, it releases invisible zinc oxide which trickles down the roof.

Zinc oxide is a fungistatic compound that kills and prevents the growth of mosses, algae and fungi. However, mold will grow back if the underlying moisture issues are not addressed. To do this, you need to increase roof ventilation and air-seal the roof of the upper floor. This combination limits the entry of warm, humid air and also helps eliminate humid air that leaks.

In some modern homes, insulation levels are so high that heat doesn't reach the roof covering. In this case, additional ventilation won't really help - we need some radiant heat to escape to the attic and warm up the coating a little. For more information on how to prevent mold and mildew growth on your roof and attic, including scheduling regular roof inspections and maintenance, contact Chouinard Bros.