Why Is My Roof Streaky? Here’s What You Need to Know

If you’ve noticed black streaks, moss, or patches of discoloration on your roof, you’re not alone. These stains are common and may seem like a minor issue at first, but they can lead to bigger problems if ignored.

The most common cause of roof streaking is algae, specifically, a type called Gloeocapsa magma. It spreads through airborne spores and tends to thrive in warm, humid environments. Once it lands on your roof, it starts to grow, especially on shaded areas where moisture hangs around. Over time, you might also see moss or lichen, which can cause even more damage by holding moisture against the surface of your shingles.

These growths aren’t just cosmetic. Algae and moss can wear down your roofing materials, shorten the life of your shingles, and in some cases, lead to leaks or water damage. That’s why regular roof cleaning is important.

So, what’s the best way to clean your roof? It’s not a job for a pressure washer. In fact, using high-pressure water can damage your shingles and lead to costly repairs. Professional roof cleaners use a method called soft washing, which combines low-pressure water with specially formulated cleaning solutions that safely remove algae, moss, and dirt without harming your roof or surrounding landscaping.

A proper roof cleaning usually takes just a few hours and can dramatically improve the look and health of your roof. It also gives a roofing professional the chance to inspect for other potential issues like cracked flashing, loose shingles, or clogged gutters that could cause problems later.

It’s also important to pay attention to any warning signs that there might be a deeper issue. If you notice a musty smell in your attic, signs of water damage on your ceiling, or poor ventilation, there may be moisture getting inside. That could mean your roof needs more than just a cleaning. It might be time to check insulation, repair parts of the roofing structure, or even have the roof replaced. 

Having your roof inspected and cleaned at least once a year, especially in the spring or early summer, is a smart habit. It helps catch small issues before they become bigger problems, protects your home, and keeps your roof looking its best.

And remember, roof work can be dangerous. Between the height, the angle, and the risk of damaging your shingles, it’s not something you want to tackle on your own. Always call a licensed professional who has the right tools, training, and safety equipment to get the job done right.

Your roof is a big part of what keeps your home safe and dry. A little regular care goes a long way in keeping it that way.

Bob O’Donnell is the owner of O’Donnell Bros. Inc., a Bristol-based home improvement company established in 1975. Email your questions for Bob to info@odonnellbros.com with the subject line “Ask the Pro.” All questions may be considered for publication. To contact Bob for your remodeling needs, call O’Donnell Bros. Inc. at (860) 589-5155 or visit http://www.odonnellbros.com. Advice is for guidance only.

A Roof and Gutter Inspection Checklist for Spring

After a long New England winter, your roof and gutters deserve a little TLC. Spring is the perfect time to inspect for any damage left behind by winter and prep your home for the warmer season ahead. Here’s a simple 10-step checklist to help you spring into action because a quick, proactive check now can save you serious money and headaches down the road. 

1. Safety First. Start smart. Use a sturdy ladder on flat ground, wear shoes with good traction, and don’t go it alone. If your roof is steep or high, consider a safety harness or call in a pro.

2. Ground-Level Walkaround. Before climbing anything, take a walk around your home. Look up and scan for missing or damaged shingles, sagging rooflines, or any debris buildup from winter storms. A pair of binoculars is a handy tool here.

3. Inspect the Roof Surface. If it’s safe, climb up for a closer look. Winter’s freeze-thaw cycles can loosen shingles, damage flashing, and open up trouble spots. Focus on high-risk areas like valleys, chimneys, and skylights.

4. Flashing & Seal Check. Snow and ice can crack flashing and wear down seals around vents and roof joints. Look for gaps or rust, and re-seal any areas that no longer look watertight.

5. Clean Out the Gutters. Winter storms can clog your gutters with leaves, pine needles, and shingle grit. Clear out all debris and make sure water flows freely through the downspouts—otherwise, you’re risking water damage and foundation issues.

6. Confirm Gutter Slope. Gutters should slope slightly toward the downspouts. If water pools or overflows, grab a level and check. Adjust the hangers as needed to restore proper drainage.

7. Check Fascia & Soffits. Cold, wet weather is hard on wood. Look for signs of rot, peeling paint, or pest activity on the fascia boards and soffits—these areas often show the first signs of hidden water damage.

8. Peek Into the Attic. Head inside and inspect the underside of your roof. Water stains, mold, or musty smells could mean you’ve got a leak. Also check that your attic vents are clear to allow air to circulate and moisture to escape.

9. Take Photos. Snap pictures of anything that looks questionable. These will come in handy if you need to call a contractor—or if an insurance claim is necessary.

10. Schedule a Pro Inspection. Even if everything looks good, a professional inspection once a year is a smart move. Pros know where to look for hidden issues and can help extend the life of your roof with early fixes.

Spring is the season for fresh starts and smart maintenance. Your roof worked hard all winter. Give it the attention it deserves this spring so it can keep doing its job all year long. A little maintenance now means fewer surprises later.

Bob O’Donnell is the owner of O’Donnell Bros. Inc., a Bristol-based home improvement company established in 1975. Email your questions for Bob to info@odonnellbros.com with the subject line “Ask the Pro.” All questions may be considered for publication. To contact Bob for your remodeling needs, call O’Donnell Bros. Inc. at (860) 589-5155 or visit http://www.odonnellbros.com. Advice is for guidance only.

Late Winter Tasks for Homeowners

As Connecticut homeowners brace for the final stretch of winter, it’s a good time to focus on a few important tasks before spring arrives. With the unpredictability of late winter weather, these tasks will help ensure your home is prepared for both the lingering cold and the transition into warmer months. Here are some key tasks to consider in late winter:

1. Inspect Your Roof and Gutters

Winter storms, snow, and ice can cause damage to your roof. Before the snow melts completely, it’s important to inspect your roof for any missing or damaged shingles, especially if you experienced heavy snow or ice buildup. Be sure to check your attic for any signs of leaks. It's also a good time to clear out your gutters. Ice and snow can cause gutters to clog with debris, which can lead to water damage when the snow begins to melt.

2. Check Windows and Doors for Drafts

Late winter is a good time to check your home for drafts. Cold air can slip through gaps around windows and doors, which can increase heating costs and decrease comfort. Walk around your home and feel for drafts. If you find any, consider adding weatherstripping or caulking to seal the gaps. This small effort can make a big difference in maintaining an even temperature and reducing energy use.

3. Prepare Your Heating System for the Final Stretch

In late winter, your heating system has been working hard for several months. To ensure it continues to operate efficiently, change the filters in your furnace or heating system. Dust and debris can clog filters, forcing the system to work harder. Check your heating vents and baseboards for any blockages to make sure warm air flows freely throughout your home. If you haven’t had a professional checkup yet, consider scheduling one before the coldest months are behind you.

4. Check for Ice Dams

Ice dams are a common issue in Connecticut during late winter, and they can cause significant damage to your roof and attic. They occur when snow on the roof melts, but the water refreezes at the eaves, creating a barrier that traps water on the roof. This water can seep into your home and cause leaks. If you notice ice buildup along the eaves of your roof, take action by using a roof rake to clear snow or contact a professional to safely remove the ice dams.

5. Prepare for the End of Snow Removal Season

Even though the snow might be thinning out, it’s important to stay prepared for any late-season snowstorms. Make sure your snow removal tools are in good condition. If you use a snowblower, check the fuel levels and ensure that it's ready for use. Stock up on ice melt or sand to help with slipping hazards as temperatures fluctuate.

6. Take Care of Winter Wear and Gear

With the end of winter on the horizon, it’s a good time to inspect and organize your winter gear. Clean snow shovels, salt spreaders, and other tools that you’ll be putting away until next year. Ensure that your winter clothing, like jackets, boots, and gloves, are in good condition for the final stretch of cold weather.

7. Inspect Your Pipes for Potential Freezing

While Connecticut winters are generally mild compared to other parts of the country, freezing pipes can still become a concern, especially during extreme cold snaps. Check any exposed pipes, particularly in areas like basements, attics, and garages. If you notice any cracks or weak spots, consider wrapping the pipes in insulation to protect them from freezing. If you’ve already had issues with frozen pipes, it may be a good idea to check for any damage to the plumbing that could cause leaks as the weather warms.

8. Clean Your Fireplace and Chimney

If you use a fireplace for heat or ambiance during the winter months, make sure to clean the chimney before the season is over. Creosote buildup in the chimney can be a fire hazard, so consider scheduling a professional cleaning if you haven’t done so recently. This is especially important before you begin to use the fireplace less frequently in the spring.

By focusing on these late winter tasks, homeowners can stay ahead of potential issues and ensure their home remains comfortable and efficient as the seasons transition. While spring may feel a little way off, a bit of late winter prep can make the changeover smoother when the time comes.

Bob O’Donnell is the owner of O’Donnell Bros. Inc., a Bristol-based home improvement company established in 1975. Email your questions to info@odonnellbros.com with the subject line “Ask the Pro.” All questions may be considered for publication. To contact Bob for your remodeling needs, call O’Donnell Bros. Inc. at (860) 589-5155 or visit http://www.odonnellbros.com. Advice is for guidance only.