The Washer - Pressure Washing And More

The black discoloration that is covering part or all of your shingle roof is not dirt but is actually algae. Algae covered roofs are very common here in Tennesse and are found on many homes with shingles over 5 years old. Algae thrives in Tennessee's humid climate and actually feeds on the limestone filler now being used in roof shingles. Algae can go for long periods of time without water and it is unaffected by heat or downpours and it goes dormant in winter.