What's Under Your Roof Matters

When you’re getting estimates for a new roof, most of the conversation naturally revolves around the things you can see, including the shingles, color, style and, of course, the final price.

There is another part of your roof that deserves just as much attention, even though you will probably never see it once the job is finished: the plywood underneath.

The plywood, also called roof decking or sheathing, is essentially the foundation of your roofing system. The underlayment and shingles are installed over it, so the decking needs to be solid, dry and structurally sound enough to properly support the new roof. The tricky part is that we often do not know exactly what condition that plywood is in until the old roof comes off.

A roof can look relatively normal from the outside while hiding deteriorated plywood underneath. Years of small leaks, condensation, poor ventilation, or moisture intrusion can leave sections of the decking soft, rotten, moldy or otherwise compromised. Once the old shingles and underlayment are removed, the roofing crew finally gets a good look at what has been happening underneath.

Does that mean every roof replacement needs all-new plywood? Not necessarily. If the existing decking is dry, solid, properly installed, and in good condition, there may be no reason to replace it. However, if portions have deteriorated, replacing those sections is an important part of doing the roof correctly.

This is also one of the areas where homeowners can get caught off guard by cost. Plywood is expensive, and depending on how much needs to be replaced, it can add a noticeable amount to the final bill. When you are already making a major investment in a new roof, it is understandable to wonder whether the old plywood can simply stay in place.

Putting brand-new roofing materials over deteriorated decking is a little like installing beautiful new hardwood floors over a damaged subfloor. You may save money that day, but you have not solved the underlying problem.

Weak or damaged decking may not hold roofing fasteners as securely as sound material. It can also contribute to uneven or sagging areas and leave the roofing system more vulnerable to problems in the future. Most importantly, you are installing a product designed to last for decades over a foundation that may already be deteriorating.

There is also the issue of the manufacturer’s warranty. Roofing manufacturers generally require shingles to be installed according to their specifications and over an appropriate, sound roof deck. Installing shingles over compromised or improperly prepared decking can potentially affect warranty coverage. The exact requirements vary by manufacturer and product, which is another reason the condition of the decking should be addressed during installation rather than ignored.

I always encourage homeowners to look beyond the big number at the bottom of a roofing estimate and review what is actually included. Ask your contractor what the estimate says about plywood or roof decking, whether any replacement is included and what the additional cost will be if deteriorated sections are discovered after the old roof is removed.

This is especially important when comparing estimates from different contractors. One contractor may appear considerably less expensive than another, but the two estimates may not include the same scope of work. If one accounts for replacing damaged decking and another barely mentions it, the lower price may not tell the whole story.

Nobody likes unexpected costs during a home improvement project, and contractors do not particularly enjoy delivering that news either. However, when we uncover rotten or deteriorated plywood, replacing what needs to be replaced is usually money better spent than covering up the problem and hoping for the best.

A new roof is a significant investment in your home, and ideally, you should be able to install it and not worry about it again for a very long time. When the old shingles come off, homeowners should understand what is underneath, review the condition of the decking with their contractor and know how any necessary replacement will affect the project.

Saving money is always worthwhile, but cutting a corner that could compromise the life of your new roof rarely is.

Bob O’Donnell is the owner of O’Donnell Bros. Inc., a Bristol-based home improvement company established in 1975. Have a question? Email info@odonnellbros.com with the subject line “Ask the Pro.” For your remodeling needs, call O’Donnell Bros. Inc. at (860) 589-5155 or visit www.odonnellbros.com. Advice is for general guidance only.

When you’re getting estimates for a new roof, most of the conversation naturally revolves around the things you can see, including the shingles, color, style and, of course, the final price.

There is another part of your roof that deserves just as much attention, even though you will probably never see it once the job is finished: the plywood underneath.

The plywood, also called roof decking or sheathing, is essentially the foundation of your roofing system. The underlayment and shingles are installed over it, so the decking needs to be solid, dry and structurally sound enough to properly support the new roof. The tricky part is that we often do not know exactly what condition that plywood is in until the old roof comes off.

A roof can look relatively normal from the outside while hiding deteriorated plywood underneath. Years of small leaks, condensation, poor ventilation, or moisture intrusion can leave sections of the decking soft, rotten, moldy or otherwise compromised. Once the old shingles and underlayment are removed, the roofing crew finally gets a good look at what has been happening underneath.

Does that mean every roof replacement needs all-new plywood? Not necessarily. If the existing decking is dry, solid, properly installed, and in good condition, there may be no reason to replace it. However, if portions have deteriorated, replacing those sections is an important part of doing the roof correctly.

This is also one of the areas where homeowners can get caught off guard by cost. Plywood is expensive, and depending on how much needs to be replaced, it can add a noticeable amount to the final bill. When you are already making a major investment in a new roof, it is understandable to wonder whether the old plywood can simply stay in place.

Putting brand-new roofing materials over deteriorated decking is a little like installing beautiful new hardwood floors over a damaged subfloor. You may save money that day, but you have not solved the underlying problem.

Weak or damaged decking may not hold roofing fasteners as securely as sound material. It can also contribute to uneven or sagging areas and leave the roofing system more vulnerable to problems in the future. Most importantly, you are installing a product designed to last for decades over a foundation that may already be deteriorating.

There is also the issue of the manufacturer’s warranty. Roofing manufacturers generally require shingles to be installed according to their specifications and over an appropriate, sound roof deck. Installing shingles over compromised or improperly prepared decking can potentially affect warranty coverage. The exact requirements vary by manufacturer and product, which is another reason the condition of the decking should be addressed during installation rather than ignored.

I always encourage homeowners to look beyond the big number at the bottom of a roofing estimate and review what is actually included. Ask your contractor what the estimate says about plywood or roof decking, whether any replacement is included and what the additional cost will be if deteriorated sections are discovered after the old roof is removed.

This is especially important when comparing estimates from different contractors. One contractor may appear considerably less expensive than another, but the two estimates may not include the same scope of work. If one accounts for replacing damaged decking and another barely mentions it, the lower price may not tell the whole story.

Nobody likes unexpected costs during a home improvement project, and contractors do not particularly enjoy delivering that news either. However, when we uncover rotten or deteriorated plywood, replacing what needs to be replaced is usually money better spent than covering up the problem and hoping for the best.

A new roof is a significant investment in your home, and ideally, you should be able to install it and not worry about it again for a very long time. When the old shingles come off, homeowners should understand what is underneath, review the condition of the decking with their contractor and know how any necessary replacement will affect the project.

Saving money is always worthwhile, but cutting a corner that could compromise the life of your new roof rarely is.

Bob O’Donnell is the owner of O’Donnell Bros. Inc., a Bristol-based home improvement company established in 1975. Have a question? Email info@odonnellbros.com with the subject line “Ask the Pro.” For your remodeling needs, call O’Donnell Bros. Inc. at (860) 589-5155 or visit www.odonnellbros.com. Advice is for general guidance only.

Is Fall Mold Creeping Onto Your Roof

As the crisp autumn air settles in and the leaves start to fall, most homeowners are focused on pumpkin decor and raking their yards. But there’s something sneaky that may be settling in overhead: roof mold. Yes, fall is prime time for mold to make itself at home on your shingles, and ignoring it could lead to bigger (and more expensive) problems down the road.

Let’s break down what roof mold is, why it thrives in the fall, and what you can do to kick it to the curb before it spreads.

Why Fall Is Mold’s Favorite Season

Mold is a fungus that loves moisture, shade, and organic debris - all of which come together perfectly during autumn in New England. Here’s why:

• Falling Leaves: Leaves that land on your roof can trap moisture and block sunlight, creating damp, shaded pockets where mold thrives.

• Cooler Temperatures: As temperatures drop, homeowners may not notice excess moisture buildup because it’s not evaporating as quickly.

• Shorter Days: Less sunlight means less natural drying power for your roof.

• Clogged Gutters: Leaf-filled gutters lead to poor drainage and water pooling on the roof. Mold eats this up, literally.

What Mold Does to Your Roof (It’s Not Just Ugly)

Roof mold might seem like just a cosmetic issue, until it isn’t. Here’s what can happen if mold takes hold:

• Shingle Damage: Mold can deteriorate asphalt shingles and shorten your roof’s lifespan. It eats away at the granules that protect your roof from UV rays and weather damage.

• Wood Rot: If moisture seeps beneath the shingles, it can lead to rotting of the underlying wood structures, threatening your roof’s structural integrity.

• Insulation Issues: Mold creeping into your attic or insulation can ruin energy efficiency, sending your heating bills through the roof - pun intended.

• Health Concerns: Mold spores can make their way into your home’s air, potentially triggering allergies, asthma, or other respiratory issues for your family.

How to Stop Fall Mold Before It Starts

The good news? Roof mold isn’t inevitable. With a little proactive maintenance, you can keep your roof mold-free all season long. Here’s how:

1. Clean Your Roof (and Gutters)
   Leaves, twigs, and debris are mold’s favorite housewarming gifts. Clear your roof and gutters regularly, especially after a big wind or rainstorm.

2. Check Your Attic Ventilation
   Poor airflow in the attic can trap moisture and encourage mold growth from the inside out. Make sure vents are clear and consider installing an attic fan if airflow is limited.

3. Trim Back Overhanging Branches
   Shade is great for picnics, not for roofs. Cutting back branches allows more sunlight to hit your roof and dry up any lingering moisture.

4. Inspect for Leaks and Damaged Shingles

   Take a walk around your home and look for signs of water damage, cracked shingles, or dark streaks. If you spot anything suspicious, call in a pro.

5. Consider Copper or Zinc Strips
   These metal strips, installed near the peak of your roof, naturally kill mold and algae as rainwater washes down over them. It’s a smart investment for long-term mold prevention.

6. Book a Professional Roof Inspection
   Fall is an ideal time to have a professional take a look. They can spot early signs of mold or damage you might miss from the ground.

When in Doubt, Call It Out

If you already see mold growing on your roof, don’t panic, but don’t ignore it either. DIY solutions may help with small patches, but for widespread or stubborn growth, it’s best to bring in the experts. Professional mold removal will ensure it’s safely and thoroughly taken care of, without damaging your roof in the process.

A clean, mold-free roof isn’t just about curb appeal. It’s about protecting your investment, your home’s structural integrity, and your family’s health. So this fall, while you’re sipping cider and enjoying the foliage, take a few minutes to look up. Your roof might be trying to tell you something.

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.

Tackling Humidity Hazards at Home

With a solid mix of heat, humidity, and rain so far this summer season, now is the perfect time to talk about what high moisture can do to your home. 

Let’s start with a bit of background on mold, which is the biggest threat to homes that hold a lot of humidity. Mold is made up of thousands of microscopic spores that travel through the air until they land on a surface. They love to live in places that hold water, which is why you often see mold growing on trees, roofs, and other places that stay warm and damp. Indoor mold generally develops after being carried in from the outdoors or because of a leak that hasn’t been remedied. Homes that tend to hold a lot of humidity are more susceptible to mold infestation, something that no homeowner wants to deal with. 

Many people can get sick from mold and mildew, especially children and the elderly. It grows and spreads incredibly quickly and cannot be contained without removing its food source, which is water. Once it settles inside a home, mold can cause illness, asthma, and a host of other respiratory issues that can affect a person’s health for life.

So how can you get rid of mold in your living space, or prevent it from making a home in yours? Here are my top tips.

1. Run a dehumidifier in your basement constantly. I have an air-tight finished basement and I still run a dehumidifier 24/7. The goal here is to keep your air humidity at or below 50%. When it’s raining or super humid, don’t be surprised if you have to dump the water collection bucket twice a day. 

2. Always use the extractor fan while showering or cooking. With so much water in the air from the weather, the last thing you want to do is add more moisture inside your home. Be sure that your fans vent outside, not in the attic. Otherwise, you’re just redirecting the moisture to another part of the house. 

3. An air conditioner is not a dehumidifier. Yes it will remove some humidity but an air conditioner’s main function is to cool the air, rather than remove the water. If you find yourself running your A/C unit to control your humidity, you’re going to end up with an expensive energy bill and not too much to show for it.

4. Store unused clothing and linens in airtight plastic. People often put winter clothes and bedding up in the attic, which can be a breeding ground for mold if the area is not ventilated properly. Keeping the attic vented is key, good airflow can slow or even prevent mold growth.

5. Check the drainage around your home. Gutters should be clean and in working order and your landscaping should slope away from the foundation so you don’t have standing water at the base of your house. Make sure your downspouts extend at least four feet out and away from that foundation.

In short, a house with high humidity is nothing to ignore. If you suspect that your home might be susceptible to mold, it’s worth purchasing an inexpensive humidity gauge to find out. Remember, a mold problem can be a serious health risk to your family if not dealt with properly. 

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.