As winter approaches, it’s time to get your roof ready for the colder months. Your roof is your home’s main shield against the elements, and regular upkeep can help prevent expensive repairs and improve energy efficiency. In this guide, we’ll walk you through the steps to winterize your roof so it’s prepared for whatever the season brings.
Assess Your Roof’s Current Condition
Before diving into specific winterization tasks, evaluate your roof’s overall condition. This assessment will help you identify potential problem areas and prioritize necessary repairs.
Check for Missing or Damaged Shingles
Inspect your roof for any missing or damaged shingles. Even a few missing shingles can cause leaks and water damage in your home. Look for shingles that are cracked, curled, or completely absent.
Replace any missing shingles as soon as possible. You may be able to repair individual shingles if they only have minor damage. If you notice widespread damage or are unsure about making repairs yourself, consult a professional roofing company.
Pro Tip: Norm Abram, TOH master carpenter, recommends starting your roof inspection from the ground: “You don’t even have to climb up on the roof to take a look. Get a pair of binoculars, and you can scan nearly every square inch from the ground or on a short ladder.” On an asphalt roof, look for cracked, cupped, curling, or broken shingles. Since roof leaks often originate at the flashing, give those areas a close look to check for open seams, rust, or cracked roofing cement.
Inspect for Signs of Sagging
A sagging roof requires immediate attention. Walk around your property and look at your roof from different angles. Areas that appear to be dipping or sagging could indicate underlying structural problems or water damage to the roof decking.
Sagging areas can worsen over winter due to the added weight of snow and ice. If you observe any signs of sagging, have a professional roofer assess the situation and make necessary repairs before winter sets in.
Pro Tip: Tom Silva, This Old House general contractor, advises that a sagging ridge “may be an indication of bigger problems that need addressing. Get a reputable, licensed contractor or structural engineer to determine what’s causing the sag and propose how to correct it or stabilize it.”
Look for Granule Loss on Asphalt Shingles
If you have an asphalt roof, check for excessive granule loss on your shingles. These granules protect your roof from the sun’s UV rays and help shed water. To inspect for granule loss, look for areas where the shingles appear smoother or have a different color than surrounding areas.
Some granule loss is normal, especially on newer roofs, but if you notice significant bare patches or your gutters are filled with granules, it may be time to consider a roof replacement. Shingles with extensive granule loss are more vulnerable to winter damage and may not effectively protect your home.
Pro Tip: Tom Silva, TOH general contractor, advises looking for roof trouble from a safe vantage point: “Don’t use a ladder, though. Binoculars are easier and a lot safer, and you can spot most problems from the ground.” Look for “smooth, dark areas, which indicate that the protective granules have worn off.”
What Granules Actually Do: As Norm Abram has explained, “Roofing grit is used as a UV block to protect the underlying material in asphalt and other shingles. If the grit has come off, that means that portions of your roof are unprotected and deteriorating.” In other words, granule loss isn’t just cosmetic — it signals active breakdown of the shingle’s waterproofing layer.
Clean and Maintain Your Roof’s Gutters
Clean your gutters thoroughly before winter arrives. Clogged gutters can cause ice dams and lead to water backing up under your shingles, potentially damaging your roof and home’s interior. Remove leaves, twigs, and other debris that has accumulated over time. Practice ladder safety and wear durable gloves to remove debris by hand. You can also use a leaf blower or a garden hose to flush out the gutters. Check that downspouts are clear and water flows freely through them.
To reduce how often you have to clean your gutters and minimize the risk of clogs, install gutter guards. Guards help prevent leaves and debris from clogging up your gutters while still allowing water to flow through.
There are many types of gutter guards available, including mesh screens, reverse-curve guards, and foam inserts. Choose a system that works best for your home and climate. While gutter guards require an initial investment, they can save you time and effort in the long run.
For the most effective cleaning, TOH’s gutter maintenance guide recommends starting at the downspout so standing water has a way out. Use a standoff to rest your ladder on the roof rather than the gutter itself—this prevents dents and scratches and increases ladder stability. Stay on the ladder rather than working from the roof, where falls are more likely. Scoop debris into a bucket hooked to a ladder rung so it doesn’t splash onto the lawn or siding, then flush the entire run with a hose and scrub with a stiff-bristle brush to remove remaining dirt.
Pro Tip: Tom Silva, TOH general contractor, recommends upgrading your downspouts to prevent clogs: “One good way to prevent clogs is to fit your gutters with big downspouts, either 4-inch round or 3-by-4-inch rectangular. Bigger downspouts also allow a gutter to handle more runoff without overflowing.”
Improve Attic Ventilation and Insulation for Winter
Attic ventilation and insulation help maintain a healthy roof and reduce energy costs. These elements work together to regulate temperature and moisture levels in your attic space.
Ensure Proper Air Circulation
Good attic ventilation helps prevent moisture buildup and maintains a consistent temperature in your attic space. This is particularly important in winter, as it helps prevent ice dams from forming on your roof.
Check that your attic has sufficient intake and exhaust vents. Intake vents are usually located in the soffits or eaves, while exhaust vents are near the roof peak. Make sure these vents aren’t blocked by insulation or debris. If you’re unsure about your attic’s ventilation, consult a roofing professional to assess and improve the airflow.
Pro Tip: Tom Silva advises: “You want a roof to be as cold as possible to prevent ice dams.” At his brother’s house in Billerica, Massachusetts, he installed a pair of 12-inch fans to push hot air out in summer, but one can also pull cold air inside during winter when there’s an insulating layer of snow on the roof — keeping the roof surface cold and preventing snowmelt from refreezing at the eaves.
Tom Silva once demonstrated just how important cold roof ventilation is when he stopped an active ice dam leak with nothing more than a box fan. “I got a call from some frantic home owners, and went to their house to see water dripping down the plaster walls of their bedroom,” he recalls. Going up to the attic, he pointed an ordinary box fan as close to the leak as possible. “That cooled the back of the roof in that spot, and everything froze. The leak stopped within minutes.” It’s a dramatic reminder that proper attic ventilation and insulation aren’t just about energy savings — they’re your roof’s first line of defense against winter damage.
Pro Tip: Don’t overlook household moisture sources that vent into the attic. Tom Silva always installs exhaust fans above showers and stovetops, but stresses: “The fans have to be vented outside the house, not into the attic. Otherwise you’re dumping moisture on the underside of the roof.” Similarly, make sure your clothes dryer vents directly outside — and not less than two feet beneath a soffit vent, since that warm, wet air can rise and accumulate underneath the roof sheathing.
Add Insulation To Prevent Ice Dams
Proper insulation helps maintain a consistent temperature in your attic, which can prevent ice dams from forming. Ice dams form when heat escapes through the roof and melts snow, which then refreezes at the eaves.
Inspect your attic insulation and add more if necessary. How much insulation you need depends on your climate zone, but you generally want an insulation thickness of at least 10–14 inches. Pay attention to areas around chimneys, vents, and other penetrations to ensure they’re sealed and insulated well.
Address Potential Leak Sources in Your Roof
Identifying and fixing potential leak sources before winter arrives can save you from costly water damage.
Inspect Flashing Around Chimneys and Vents
Flashing is the metal material used to seal joints and stop water from entering your home. Check the flashing around chimneys, vents, skylights, and any other roof penetrations. Look for signs of damage, such as rust, cracks, or gaps. If you notice any issues with the flashing, repair or replace it promptly. This may involve resealing joints with roofing cement or replacing damaged flashing entirely.
Check for Water Stains in the Attic
Inspect your attic for signs of water stains or dampness. These can indicate existing leaks that need to be addressed before winter. Look for discolored areas on the roof decking, insulation, or attic floor. If you find water stains, try to trace the source of the leak. The entry point may be several feet away from where the water stain appears.
Remove Hazards From Around Your Roof
Low-hanging branches pose a risk to your roof during winter storms. Heavy snow or ice can lead to branches breaking and falling onto your roof. Trim any branches that hang over or near your roof. Aim to keep a clearance of at least 10 feet between tree limbs and your roof.
Remove any debris that has accumulated on or near your roof, including leaves, twigs, and other organic matter that can retain moisture and promote the growth of moss or algae. Use a leaf blower or soft-bristled broom to gently clear debris from your roof. Be careful not to damage the shingles in the process. Also, clear any debris from around your home’s foundation.
Tackle Roof-Damaging Microorganisms
Inspect your roof for signs of moss, algae, or lichen growth. These organisms can retain moisture and lead to premature deterioration of your roofing materials. Carefully remove any growth using a soft-bristled brush or a specialized roof-cleaning solution. Avoid using pressure washers, which can damage roof shingles. For extensive growth or if you’re uncomfortable working on your roof, hire a professional roof cleaning service.
After removing any existing growth, apply a preventative treatment to discourage future moss and algae growth. There are various products available, including zinc strips that can be installed near the roof peak.
Pro Tip: Tom Silva, TOH general contractor, recommends a simple cleaning mix: “Use a pump sprayer to wet down the roof with a mix of one part bleach to two parts water.” He advises scrubbing gently with a soft window-washing brush mounted on a telescoping extension pole so you can work safely from a ladder rather than climbing on the roof. “Don’t use a pressure washer, which could damage the shingles,” he warns. Be sure to rinse foundation plantings with fresh water before and after to protect them from bleach runoff.
Prepare Your Roof for Extreme Winter Weather
Taking additional precautions can help protect your roof in areas prone to heavy snowfall or severe winter storms.
Install Snow Guards
Snow guards are devices installed on roofs to prevent large sheets of snow and ice from sliding off all at once. They’re a good choice for metal roofs or steeply pitched roofs where snow accumulation can pose a danger to people and property below.
Consider installing snow guards if you live in an area that receives significant snowfall. These can be especially beneficial for protecting entryways, walkways, and landscaping from falling snow and ice.
Use a Roof Rake for Heavy Snowfall
In regions that experience heavy snowfall, a roof rake can be a valuable tool for maintaining your roof during winter. A roof rake allows you to remove excess snow from your roof from the safety of the ground. If you decide to use a roof rake, leave a thin layer of snow on the roof to avoid scraping the shingles. Watch out for any potential hazards, such as power lines or icy surfaces.
