Tackling Mold on Your Roof

Mold is a type of fungi that thrives in damp and humid conditions, making your roof a potential spot for growth. While roof mold might not be as noticeable as the mold you see inside your home, it can lead to some serious issues if ignored. Here are a few things to keep in mind about the risks associated with mold on your roof:

Structural Integrity: Mold can weaken your roof’s structure. It can damage shingles, deteriorate wood, and affect the overall stability of your roofing system.

Health Concerns: Mold spores can become airborne and make their way into your home, potentially causing respiratory problems, allergies, and skin irritations.

Energy Efficiency: Mold can compromise your insulation, leading to higher energy bills and a less comfortable indoor environment.

Curb Appeal: A moldy roof isn’t just a concern for your home’s health; it can also impact its appearance and market value.

To keep your home and family safe from the risks of mold, it’s important to take proactive steps. Here are some friendly tips for prevention and remediation:

1. Schedule Regular Roof Inspections: Aim for annual inspections to catch mold early. Professionals can spot potential issues before they become serious.

2. Ensure Proper Ventilation: Good airflow in your attic and roof helps keep moisture levels in check, reducing the risk of mold. Consider adding roof vents or attic fans if needed.

3. Clean Your Gutters and Downspouts: Clogged gutters can lead to water pooling on your roof. Regular cleaning can help prevent this and reduce mold growth.

4. Repair Any Leaks Promptly: Address signs of water infiltration as soon as you notice them. A leaking roof is a prime spot for mold to thrive.

5. Act Quickly on Mold Removal: If you discover mold, it’s important to take action. Hiring professionals experienced in mold removal is the safest way to ensure thorough and effective treatment.

6. Install Zinc or Copper Strips: Consider placing these metal strips at the top of your roof. Rainwater reacts with them to release ions that can help prevent mold and algae growth.

7. Trim Overhanging Trees: Keeping tree branches away from your roof allows for better sunlight and airflow, which can deter mold growth.

8. Choose Mold-Resistant Roofing Materials: When it’s time for a roof replacement, consider materials designed to resist mold growth.

Mold on your roof is a concern that deserves attention. By taking preventive measures and addressing issues promptly, you can protect your home and your loved ones. Regular inspections, proper ventilation, and maintenance are key to keeping your roof healthy. If you find mold, don’t hesitate to seek professional help to ensure your roof stays mold-free. A well-maintained roof not only safeguards your home but also enhances its beauty and value.

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.

Leaks Around the Chimney? Blame it on the Squirrels

I received a question from a reader that I wanted to share with you. She asked: 

Dear Bob, I've had some leaking around my chimney. I thought this didn’t seem very strange considering all the snow we’ve had, but when we went to take a look at it, we noticed lots of small holes around the flashing. What would be the cause of this? - Dot B.

Dot, this is a great question and I have received so many calls about it recently so you’re not alone. Believe it or not, the culprit of the small holes around your chimney flashing is squirrels. Flashing is often made of lead, which is a soft metal that squirrels feast on because it supposedly has a sweet taste. More practically, it also helps our rodent friends gnaw down and control their fast-growing teeth. Then, of course, there is the warmth that is escaping from your attic which makes for a pretty cozy place to spend these cold winter days.

Of course, we all know that lead is poisonous, so squirrels chomping down on your flashing is very likely going to kill them in addition to opening up your roof to potential leaks. Flashing bridges the gap between the chimney and your roof, creating a watertight barrier. If it’s damaged, water can easily get into the attic and eventually down into the home. So I’d suggest dealing with the problem right away before it becomes more costly and complicated.

One simple DIY method is to cover the flashing with the taste that squirrels hate the most - capsaicin, the active ingredient in cayenne pepper. You can mix pepper sauce or powder with water and spray it on the affected areas which will deter them in the short term. Of course, a cheap and easy solution like this also has its drawbacks, and in this case, you’ll be pulling out the ladder again every time it rains or snows. 

You can also try deterring the squirrels from your roof by cutting back the branches and trees that make it easily accessible to them. Also, if food is more readily available, they are going to follow the path of least resistance. So fill up those wildlife feeders and keep them at a distance from your house.

If the pests persist, I recommend getting a professional to cover your current flashing with heavy duty copper which is neither attractive nor penetrable. Investing in one of these simple solutions will save both your home and your furry friends from an untimely demise.

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 www.odonnellbros.com. Advice is for guidance only.

There’s a roof fungus among us

Has a pattern of strange, streaky stains appeared on your roof this spring? As I drive around town, I see many houses decorated with a display of unsightly roof residue, which frequently pops up during this wetter time of the year. But what is it, why has it emerged and what can you do to get rid of it? They are all good questions, so let’s get you some answers.

Stains on the roof are generally algae or mold, which tend to crop up as humidity rises and warmer temperatures start to emerge. Now don’t be too alarmed, small black stains and mold aren’t necessarily going to ruin your roof, but they do affect the curb appeal of your home and the problem could end up being damaging if not dealt with for a long period of time.  

An interesting fact is that copper is toxic to algae, and many newer roof shingles contain copper granules, which act as a barrier against any mold growth. Homes with older roofs won’t benefit from this technology, but it explains why you won’t see algae where metal flashing has been installed. If you’re susceptible to algae and in the market for a new roof, be sure to inquire about this type of shingle.

So now that we know what it is, how do we get rid of it? The easiest way to rid your roof of mold is a good old-fashioned bleach and water mixture, which can be applied using a pump sprayer and rinsed with the garden hose. One tip is to give any plants below the roof a good drink of water beforehand so they don’t absorb the bleach mixture. Diluted bleach is a powerful compound that will clean the roof without any adverse effects, so long as you give it a good rinse afterward. There are other products on the market that will do the job, just pop into your local hardware store to find out what’s best for you based on your home’s symptoms.

Once the roof has been cleaned, you might want to do something to prevent the mold from coming back again. As I mentioned, copper, and zinc-coated sheet metal for that matter, are toxic to algae, so installing a strip of flashing will help stop that nasty fungus in its tracks. Choose a strip that’s at least six inches wide, and have it installed at the roof peak to ensure that the metal molecules wash down with the rain and protect the roof from mold build up.  

If you’re not comfortable on a ladder, call a professional to help you complete this task. A clean roof isn’t worth a trip to the hospital, and a local area home improvement specialist will be able to complete the job in less than a day.