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.

Tis the Season for Mulch

Mulch is one of the most effective and straightforward ways to improve the health and appearance of your yard or garden. It helps with moisture retention, weed control, and soil temperature regulation, while also giving garden beds a more finished look.

There are several practical reasons to use mulch. First, it helps retain soil moisture by reducing evaporation, which means less frequent watering. It also suppresses weed growth by blocking sunlight from reaching weed seeds. In addition, mulch helps regulate soil temperatures, keeping soil cooler in the summer and warmer in the winter, and can prevent soil erosion during heavy rains.

For organic mulch, there’s the added benefit of soil improvement. As it breaks down, it adds nutrients and organic matter to the soil, supporting healthier plants over time.

Organic mulch includes materials such as:

• Shredded bark or wood chips

• Straw or hay (used more often in vegetable gardens)

• Pine needles

• Leaves

• Compost

These materials break down over time and improve soil structure, but they need to be replenished periodically, usually once a year.

Inorganic mulch includes:

• Rubber mulch

• Gravel or stone

• Landscape fabric

These materials don’t break down and won’t improve the soil, but they’re longer-lasting and may be better for certain uses like pathways, around foundations, or in areas where soil enrichment isn’t needed.

The right mulch depends on your goals. For plant health and soil improvement, organic options are typically better. For durability and low maintenance, inorganic mulch may be more appropriate.

How to Apply Mulch

Applying mulch correctly is key to getting its full benefits. Here are the basic steps:

1. Clear the Area – Remove weeds and grass from the area you want to mulch. You may also want to edge the area for a cleaner border.
   

2. Prepare the Soil – Rake the soil to level it, and if you’re using compost or other amendments, mix them in before mulching.
   

3. Apply Mulch – Spread a layer of mulch 2 to 4 inches deep. Less than 2 inches may not suppress weeds effectively; more than 4 inches can prevent water from reaching the soil.
   

4. Keep It Away from Stems and Trunks – Leave a few inches of space around plant stems and tree trunks. Mulch piled directly against them can trap moisture and lead to rot or pest issues.
   

5. Maintain – Check your mulch periodically. Organic mulch will decompose over time and may need to be replenished once a year. Inorganic mulch usually needs less frequent maintenance.

Mulch is a simple and affordable way to care for your yard. By choosing the right type and applying it properly, you can improve soil health, reduce maintenance, and keep your landscape looking tidy year-round.

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.

Six Tips for Finding a Good Contractor

Every week I get calls from homeowners who have been left unsatisfied after a contractor failed to show up, left a job undone, or didn’t properly communicate costs. The process of finding a good remodeler and getting the result you want can be daunting, especially with so many options. So where do you start? As we kick off home remodeling season, here are six essential tips to help you find a trustworthy professional for your renovation plans.

1. Ask for Referrals from People You Trust

When it comes to hiring someone to work on your home, treat it like finding a great doctor or accountant. Ask friends, family, neighbors, and coworkers who they’ve used and loved. You can also check with your local building inspector or the owner of your nearby hardware or lumber store—they’ll know who consistently does quality work. And don’t forget local Facebook groups—they’re often gold mines of honest recommendations.

2. Follow Your Gut Instinct

Meeting a contractor is a lot like a first date. Do they show up on time? Do they listen to your needs and explain things clearly? Are they trying to educate you—or just sell you? A contractor who treats you like a partner (not a pitch) is someone you can build with—literally. Flashy talk and deep discounts mean nothing if your gut says no. Listen to that voice in your head. It’s usually right.

3. Ditch the “Ballpark Figure” Request

Asking for a rough estimate might sound like a smart way to get started, but it’s not going to help you in the long run. Costs vary wildly based on site conditions, material choices, and the specifics of your vision. Save time and confusion by coming prepared with a clear list of what you want. That way, contractors can give you an accurate estimate—and you can compare apples to apples.

4. Ask for a Step-by-Step Plan

You deserve to know how the job is going to unfold—from demolition to final cleanup. A good contractor will walk you through the process, provide a clear timeline, and explain what to expect at every stage. This isn’t just about convenience; it’s about building confidence and avoiding surprises. The more you understand the process, the smoother it will go.

5. Verify Licenses, Insurance, and Credentials

A professional contractor should be licensed, insured, and willing to show you proof of both. Don’t take their word for it—ask to see copies and check expiration dates. You can also verify licenses through your state’s licensing board. Bonus points if they belong to a local or national trade association—that often means they’re committed to continuing education and ethical business practices.

6. Get Everything in Writing—No Exceptions

A handshake isn’t enough. Insist on a detailed written contract that spells out the scope of work, payment schedule, timeline, and materials to be used. This document protects both of you if questions come up later. If a contractor is hesitant to put it in writing, that’s your cue to walk away. A pro knows the power of paperwork.

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 (860) 589-5155 or visit www.odonnellbros.com. Advice is for guidance only.