Summer Garage Door Care: Heat, Humidity & Pest Prevention for London Homes

Why Summer Deserves Its Own Maintenance Routine

By the time London thaws out in May, most homeowners have already given their garage door a quick once-over after a long Ontario winter. That is a good start, but it is not the end of the seasonal work. Summer brings a different set of stresses to a residential garage door, and the components that handled freezing nights now have to handle prolonged heat, higher humidity, longer hours of direct sunlight on the exterior, and a busy season for the wasps, mice, and spiders that love the sheltered spaces around your tracks and opener.

This guide walks through what summer actually does to a garage door system in our climate, what you should check on a warm Saturday morning, and which problems are worth a service call before they grow into something more expensive. London sits in a humid continental climate zone, with July highs averaging around 25.5°C and relative humidity that often runs near 75 percent in the afternoon. That combination - moderate but persistent heat plus moisture - is exactly the environment that causes lubricants to thin, weather seals to harden, and metal hardware to expand just enough to make a perfectly fine winter door start binding in August.

What Summer Actually Does to Your Garage Door

A garage door is essentially a large piece of exterior building envelope made of metal and rubber components held under spring tension. Each material in that system reacts differently to summer conditions, and the door itself sits in one of the hottest microclimates on the property: a south- or west-facing wall with no shade, often above a heat-absorbing asphalt driveway. Understanding what is happening to each part is what tells you what to check.

Metal expands and contracts daily

Steel torsion springs, rollers, hinges, and tracks all expand slightly when warm and contract when cool. The change is small in absolute terms but it happens every single day through summer, and the cumulative effect is real: rollers can ride a touch higher in their tracks, hinges may bind on their pins, and a door that closed perfectly at 8 a.m. on a 12°C morning may stop a few millimetres short on the same day at 4 p.m. when the sun has heated everything up. Older steel springs in particular experience this thermal cycling on top of the mechanical cycling from regular use, which is one of the reasons summer is a common time for an aging spring to finally fail. Our guide to torsion and extension springs explains what to look for as a spring approaches end of life.

Lubricants thin out and migrate

The white lithium grease or silicone-based lubricant that worked beautifully through January gets thinner as temperatures rise. Heat causes lubricants to break down or evaporate over time, and a coat that was applied six months ago may no longer be doing its job. The result is increased friction across the entire door system: rollers squeal, hinges chirp, the opener motor works harder, and the springs and cables wear faster. A mid-summer re-lubrication is one of the highest-value 15-minute maintenance tasks you can do. Our complete garage door lubrication guide covers exactly what products to use and where to apply them.

UV and heat degrade the exterior finish

The sunny side of a garage door takes a real beating from UV radiation. UV breaks down the chemical bonds in paint, causing fading, chalking, and over time exposing the underlying steel to moisture. According to Clopay's guidance on preventing sun damage, this fading is most pronounced on doors that face direct afternoon sun, and the damage accelerates noticeably on doors painted dark colours that absorb more solar energy than light ones. Wood doors are even more vulnerable: UV breaks down lignin, the natural compound that holds wood fibres together, leading to surface greying and eventually deeper structural cracks if the protective finish is not maintained.

Rubber weather seals harden and crack

The vinyl or rubber bottom seal and the perimeter weather stripping along the sides and top of the door work hardest in winter, but summer is when they degrade fastest. UV exposure and heat cause rubber to lose its plasticizers, become brittle, and eventually crack. A seal that was pliable in May can be visibly hardened by August. Once a seal cracks, it stops doing its job: water gets under the door in summer storms, conditioned air leaks out year-round, and small pests find an easier way in. Our dedicated garage door seal guide covers the different seal types and replacement timing in detail.

Humidity affects wood doors and electronics

London's summer humidity does two things worth flagging. On wood and composite doors, repeated cycles of moisture absorption and drying cause the panels to expand, contract, and eventually warp or split if the finish is compromised. On the opener side, electronics in the motor head are sealed but not immune; condensation can form when a hot, humid day is followed by a cooler night, and over many seasons this contributes to circuit board corrosion in older units.

Your Summer Garage Door Maintenance Checklist

Plan for one focused maintenance session in late May or early June, and a quick mid-summer check in late July or early August when the heat is at its peak. Each session takes 30 to 45 minutes if nothing is wrong, and longer only if you find a problem worth fixing on the spot.

1. Visual inspection from inside the garage

Open the door fully, then close it. Watch and listen as it travels. A healthy door moves smoothly and quietly with no jerks, no grinding, and no points where the rollers visibly bind. Then, with the door closed, look closely at: the springs (any visible gaps in the coils, rust, or stretched-looking sections); the cables (any frayed strands or kinks); the rollers (cracks in nylon rollers, flat spots, or worn bearings on steel rollers); the tracks (debris, dents, or sections where the screws holding the track to the wall have loosened). DASMA's homeowner maintenance guide recommends running these visual checks regularly, with a professional inspection at least once a year.

2. Lubricate the moving parts

Apply a fresh coat of garage door lubricant to the rollers (where the stem enters the bracket), the hinges (at each pivot point), the springs (a light spray along the coils), and any visible bearings. Wipe the tracks clean with a dry cloth - do not lubricate the inside of the tracks, since the rollers should roll, not slide. Use a silicone or lithium-based garage door spray, never WD-40, which is a penetrating oil rather than a lubricant and will actually attract grit over time. Clopay also explicitly cautions against using WD-40 anywhere on a garage door system.

3. Test the safety reverse

Place a 2x4 piece of lumber flat on the floor in the door's path and close the door with the remote or wall button. The door must reverse when it contacts the board. This is the auto-reverse function required by UL 325, the safety standard that governs garage door openers sold in North America, and it should be tested at least seasonally. If your door does not reverse on contact with the 2x4, the close force is set too high and needs to be adjusted, or there is a deeper problem that warrants a service call. Our garage door child safety guide covers why this test matters and how to interpret the results.

4. Check and clean the photo-eye sensors

The photo-eye sensors on each side of the door opening accumulate cobwebs, dust, and pollen during the busy summer months. A blocked or misaligned sensor is the single most common reason a door will not close. Wipe each sensor lens with a dry cloth, confirm both sensors show a steady (not blinking) indicator light, and check that the brackets have not been bumped out of alignment by a vehicle, lawn tool, or basketball.

5. Wash the door and inspect the finish

Use a garden hose, mild dish soap, and a soft sponge to wash the exterior of the door. Avoid pressure washers - high pressure can drive water past the seals, dent thin steel skins on lower-end doors, and strip wax coatings. While the door is clean, walk along it and check for: paint fading or chalking on the south- or west-facing surfaces; rust spots, especially along the bottom edge and around hardware; small dents that have started to oxidize; and any areas where the finish has been compromised. A coat of automotive paste wax once a year (Clopay recommends a spray-on car wax) helps protect the finish and makes washing easier next time.

6. Inspect the weather seals

Run your hand along the bottom seal and the perimeter weather stripping. The rubber should be pliable, not crunchy or brittle. Look for cracks, tears, gaps where the seal has pulled away from the door, and worn spots where the bottom seal contacts the floor. If the seal has hardened or you can see daylight along the bottom of a closed door, it is time for a replacement. A worn bottom seal is also one of the easiest entry points for the pests we cover next.

7. Check the door balance

This is the most important quick test you can run on a garage door. With the door closed, pull the red emergency disconnect cord to release the opener. Lift the door manually to about waist height and let go. A balanced door will stay roughly in place, or drift only slightly. An unbalanced door will either fall fast or shoot upward - both indicate the springs are no longer providing the correct counterweight. An out-of-balance door forces the opener to compensate, accelerating motor wear and shortening opener life. Re-engage the opener afterward by pulling the cord toward the door (not down) and lifting the door manually until the trolley clicks back in.

Heat, Lubricants, and the Quiet Door Problem

One of the most common mid-summer service calls we get at AA Advantage Doors is the door that has gradually become noisier through July. The pattern is almost always the same: a spring lubrication done in March wore off, the warm temperatures thinned what was left, and now the rollers and hinges are running close to dry. The door still works, but every cycle is louder and the opener is visibly straining at the top of the lift.

Two things are happening here. First, friction in the door system has gone up because there is no longer a lubricant film separating moving metal surfaces. Second, the springs - which do most of the work of lifting the door - have to fight that extra friction on every cycle, which adds wear to components that are designed for a finite number of cycles in their service life. A summer re-lubrication addresses both issues at once. If lubrication does not quiet the door, the next most likely culprits are worn rollers (covered in our roller replacement guide) or aging springs.

Pest Prevention: Wasps, Mice, and Spiders

The garage is one of the most pest-vulnerable spaces in a Canadian home in summer. It is sheltered, often dimly lit, contains stored items that make excellent nesting material, and connects to the outdoors through a moving door that is opened many times per day. Three pests show up reliably in London garages from May through September: wasps in the upper corners and around the opener rail, mice through gaps under the bottom seal, and spiders in tracks and around photo-eye sensors. All three are addressable with simple preventive habits.

Wasps and the importance of early-season inspection

Yellowjackets and paper wasps love the smooth, sheltered horizontal surfaces of the opener rail, the upper corners of the garage, and the back of the motor housing. Health Canada's wasp control page recommends inspecting your home and surroundings in early summer, looking for queen wasps starting to build small paper nests. A nest the size of a golf ball in May is far easier to handle than the same nest in August when it may contain hundreds of workers. Walk through the garage with the door closed and a flashlight at least once a week through June, paying particular attention to the corners where the opener rail meets the wall and the underside of any storage shelving. If you find a small early-season nest, it can often be removed at dusk when wasps are least active. Anything larger than a tennis ball is worth handing to a pest control professional.

Mice and gaps under the door

Mice can squeeze through openings as small as a dime - which is exactly the size of a small tear or wear spot in a hardened bottom seal. Health Canada's guide to rats and mice identifies worn thresholds and gaps under doors as a primary entry point and recommends metal weather stripping under doors as a first line of defence. For a residential garage door, this means: confirming the bottom seal is intact along its full length; checking that the seal contacts the garage floor evenly when the door is closed (an uneven floor or a slightly out-of-level door can leave a small gap at one corner); and decluttering the garage so there are no cosy nesting sites in stored cardboard boxes, old insulation, or piles of fabric. Health Canada explicitly recommends removing nesting clutter "around your house and garage" as part of basic prevention.

Spiders, dust, and the photo-eye sensors

Spiders are not a major garage door problem in themselves, but their webs are. A web stretched across the photo-eye beam is enough to cause the door to refuse to close - and unlike a vehicle blocking the sensor, a fine spider web is easy to miss on a quick visual check. Through the busy spider months of late summer and early fall, make a habit of wiping each photo-eye lens with a dry cloth every few weeks, and shine a flashlight along the path between the two sensors to confirm nothing is in the beam. A small handheld duster run along the tracks and the underside of the opener once a month does more than people expect to keep these systems running cleanly.

When to Call a Professional vs. Handle It Yourself

The table below summarizes the most common summer maintenance items and which ones London homeowners can comfortably tackle themselves.

An Insulated Door Pays Dividends in Summer Too

Most conversations about insulated garage doors in Ontario centre on winter heating, but the summer benefit is real and easy to overlook. According to Clopay, an insulated door can keep a garage 10 to 20 degrees Fahrenheit (roughly 5 to 11 degrees Celsius) cooler in summer than a non-insulated equivalent. For an attached garage that shares a wall with the house, that difference matters: it reduces the heat load on whatever is on the other side of that wall (often a kitchen, mudroom, or bedroom), and it makes the garage itself a much more comfortable workspace on a 30-degree July afternoon. If you have an older single-skin steel door and your garage feels like an oven by mid-afternoon, a well-insulated replacement is one of the more effective summer comfort upgrades you can make. Our deep dive on how much an insulated door can save you walks through the cost-benefit analysis for London homes specifically.

Quick Reference: Summer Care in One Page

• Re-lubricate rollers, hinges, and springs in late May or early June - and again in late July if the door is getting noisy
• Wash the door exterior at least once over the summer; wax once a year
• Wipe photo-eye sensor lenses every few weeks; clear cobwebs from tracks
• Test the auto-reverse function with a 2x4 board on the floor at least seasonally
• Inspect bottom seal and perimeter weather stripping for cracks and brittleness
• Run the manual balance test to confirm the springs are still doing their job
• Walk the garage in early summer and weekly through June looking for small wasp nests starting to form
• Confirm the bottom of the door makes even contact with the floor across its full width to keep mice out
• Never use WD-40 on any garage door component - use a silicone or lithium garage door spray
• Skip the pressure washer; use a garden hose and mild soap
• Spring tension, cable, and bottom-roller work always belong to a professional