28/09/2026
Noticed dark streaks running down your roof? You are not alone, and it is not dirt. 🏠
Those streaks are usually roof algae, and New Hampshire's humidity and shady, tree covered lots make it very common. The good news: early on it is mostly cosmetic. The bad news: if you leave it for years, it can wear down your shingles faster.
Whatever you do, please do not pressure wash it. It strips the protective granules off your shingles and can push water underneath them.
In our new guide, we cover:
✅ What the streaks actually are
✅ Whether they damage your roof
✅ How to remove them the safe way
✅ How to keep them from coming back
Read it here: https://nicktraceyroofing.com/black-streaks-on-your-roof-in-nh-what-they-are-and-how-to-remove-them/
Not sure if your roof just needs a cleaning or something more? We offer free, no obligation inspections across NH and MA. Call us at 603-921-1706.