Why Is There a Gap Under My Garage Door in Summerlin? 7 Causes and How It’s Fixed

How to Read the Gap in Two Minutes

You don’t need tools for this. You only need to look at the gap from inside with the lights off, and pay attention to its shape and when it shows up. Many Summerlin homeowners first notice the gap as a line of light in the evening, as a drift of dust or desert leaves inside the door after a windy day, or because the garage is hotter than it used to be. All of those point to the same thing. The trick is working out which of the seven causes is making the gap.

Two more clues help. First, look at the door from the driveway. If the bottom edge isn’t parallel with the top of the opening, the door is hanging crooked, and that points to cause 4 or 5. If the door looks level but the gap is still a wedge, the slab is probably sloped. Second, think about timing. A gap that appeared the day after a loud bang in the garage is almost always a spring. A gap that grew slowly over several summers is almost always the seal.

Take a photo of the gap with the lights off. It helps a technician understand the problem before arriving, and it gives you something to compare against after the repair.

When a Gap Is Urgent and When It Can Wait

Most gaps under Summerlin doors are a nuisance, not a hazard. They let in dust, desert leaves, crickets, scorpions, and summer heat, and they make an air-conditioned home work harder if the garage shares walls with living space. But a few gaps are the first visible sign that something under high tension has failed.

Garage door springs carry most of the door’s weight. A typical two-car steel door can weigh well over a hundred pounds, and the springs store enough energy to cause serious injury if they’re released the wrong way. The U.S. Consumer Product Safety Commission’s guidance on automatic residential garage door operators and the DASMA garage door safety tips both make the same point: test the safety reverse regularly, and leave spring and cable work to trained technicians.

When a door hangs crooked, one cable is carrying more of the load than it should, and the rollers on the low side are pushed against the track at an angle. Each time the opener runs, that strain gets worse. Doors in that condition can twist out of the track, bend a section, or drop on the low side if the other cable lets go. Stopping early usually keeps a cable repair from turning into a door repair.

If the door is stuck open and you need to secure the house, call us. We’re open 24 hours, and we can talk you through what’s safe to do while you wait.

Cause 1: A Hardened or Shrunken Bottom Seal

How to spot it. You’ll see patches of light rather than a single strip, usually worst at the two ends of the door and over any low spots in the concrete. Press the seal with your thumb. A healthy seal gives and springs back. A worn one feels hard, may be cracked or chalky, and often has pulled back an inch or two from the corners. After a windy spring day you may find a fan-shaped drift of dust or leaves just inside the door.

Why Summerlin seals wear out. Vinyl seals stay flexible because of additives in the material, and heat and UV light slowly break those down. Summerlin summers regularly pass 100°F, and doors that face west or south bake in the afternoon sun, with the driveway radiating heat from below. Then the nights cool off, more on this side of the valley than in the middle of town. That daily cycle of heating and cooling keeps flexing the seal, and over a few summers it goes from soft to stiff. Seals also shrink lengthwise as they age, which is why the corners usually go first.

How it’s fixed. Most steel doors in Summerlin use a slide-in seal held in an aluminum retainer on the bottom of the door. A technician slides the old seal out, cleans the channel, checks the retainer for dents and corrosion, and feeds in a new seal of the matching profile and width. The seal is left slightly long and secured at each end so it can’t creep. Wood and some custom doors, which are common in parts of The Ridges and Red Rock Country Club, use nail-on or screw-on seals instead. Because the new seal is fuller, the door now meets the floor a little sooner, so the opener’s close limit often needs a small change, and the safety reverse is tested afterward.

What to watch for. Slide-in seals come in different shapes (bulb, T-style, J-style, and others) and they only work in the retainer they were designed for. A bent or corroded retainer won’t hold a new seal straight, so it may need replacing too. And don’t remove the bottom brackets at the corners to get the retainer off. The lift cables attach there, and they’re under spring tension.

We cover seal choices, lifespans, and replacement in detail in Garage Door Bottom Seal Replacement in Summerlin: When Should You Replace the Weatherstrip?. Our valley-wide guide is Garage Door Bottom Seal Replacement in Las Vegas.

Cause 2: The Opener’s Close Limit Is Set Too High

How to spot it. The gap is the same height all the way across, and the seal is still soft. Pull the emergency release (with the door fully closed) and lower the door by hand the last inch, if it will go. If the door drops down and seals properly, the opener was stopping it short. Re-engage the trolley afterward following your opener’s manual.

Why it happens. Limits drift. A new seal, a seasonal change in how the door moves, a power surge during a summer storm, or someone pressing the wrong buttons can all change where the opener stops. Older openers with mechanical limit screws drift more than newer ones that set their limits electronically. Some homeowners also raise the limit on purpose after the opener starts reversing at the floor, which fixes one problem and creates another.

How it’s fixed. The limit is lowered until the door just compresses the seal along the floor without the opener straining or reversing. On newer openers, that’s done with programming buttons on the motor unit. On older ones, it’s an adjustment screw. The force setting should stay where the manufacturer set it. After any change, the safety reverse is tested by closing the door on a 2×4 laid flat on the floor, and the photo-eyes are tested by breaking the beam while the door closes. Those tests come from the UL 325 standard that governs residential openers; see UL’s overview of UL 325 safety issues.

What to watch for. If the door won’t seal until you turn the force up, something else is wrong, usually binding in the tracks or a spring that’s out of balance. Turning up the force hides the problem and weakens the opener’s ability to reverse on an obstruction. If your opener is reversing at the floor, see Garage Door Won’t Close in Summerlin? 10 Causes. For opener service, see our garage door opener repair page.

Cause 3: Sloped Driveways and Settled Slabs

How to spot it. The door itself looks level from outside, the seal is soft, and the cables look even, but light still shows at one end or in one area. Lay a long level or a straight board across the floor under the door. If one end is noticeably lower, or there’s a dip near the middle, the floor is the cause.

Why it’s common in Summerlin. Summerlin was built in villages across rising ground at the western edge of the valley. Lots were graded to step down the slopes, and many driveways fall steeply to the street. Garage slabs are usually poured with a slight pitch toward the door so water runs out, and the area right at the threshold is often where the garage slab meets the driveway apron. Those joints can settle a little over the years, especially where soils were filled during grading or where irrigation keeps the ground damp. Older homes in the first villages, from the early 1990s, have had the most time to settle.

How it’s fixed. For small differences, a bottom seal with a taller or more flexible profile can follow the floor. For larger or uneven differences, a rubber threshold strip glued to the slab under the door gives the seal something level to close against and also helps stop water running in. Threshold seals need to be placed so they don’t trip anyone or catch the bottom of the door. A badly settled or cracked slab is a concrete job, not a door job. A door technician shouldn’t try to “fix” a sloped floor by adjusting one cable shorter, because that leaves the door out of balance.

What to watch for. If the floor gap is new, check whether the door has changed rather than the floor. A cable problem can make a door that used to seal suddenly look like it’s sitting on a sloped floor.

Cause 4: A Slipped, Stretched, or Frayed Lift Cable

How to spot it. The gap gets wider toward one side. From the driveway, the bottom of the door isn’t parallel with the top of the opening. With the door closed, look at the cable on each side. One may be loose or bunched while the other is tight, or you may see broken strands near the bottom bracket. The door may also shudder or move unevenly.

Why it happens. Cables wear where they wrap the drum and where they attach at the bottom brackets. Rust and grit speed that up, and fine dust is never in short supply on the west side of the valley. A door that hits an obstruction or comes partly off track can unwind a cable from its drum. A weak or broken spring can let a cable go slack and jump its groove.

How it’s fixed. The door is secured, the spring tension is let off safely, the cable is reseated or replaced (usually both cables are replaced together so they wear evenly), the drums are checked for damage, and the springs are re-tensioned so the door hangs level and balanced. Then the door is run, the gap is rechecked, and the safety reverse is tested. On our price guide, cable work falls under standard repairs at $150 to $350.

What to watch for. Don’t keep running a door that’s hanging crooked. A slack cable can tangle, and a frayed one can snap and let the door drop on that side. See Frayed Garage Door Cable in Summerlin: Can You Keep Using the Door?, Garage Door Cable Came Off the Drum in Summerlin, and our garage door cable repair page.

Cause 5: A Broken or Weak Spring and an Unbalanced Door

How to spot it. Look at the springs on the shaft above the door, with the door closed. A broken torsion spring usually shows a clear gap of an inch or more between coils. Many homeowners heard a loud bang from the garage shortly before the gap appeared. The door may feel very heavy if you lift it by hand with the opener released, or the opener may lift it only a few inches and stop. Don’t keep trying. Running an opener against a broken spring strains the motor and gears and can unspool the cables.

Why it happens. Every spring is rated for a certain number of open-and-close cycles. Standard springs are commonly rated around 10,000 cycles; high-cycle springs last longer. A busy household that uses the garage as its front door can reach that in well under ten years. Rust on the coils adds friction, and the large daily temperature swing on Summerlin’s side of the valley adds stress. A spring that’s getting weak doesn’t always break cleanly. It may just stop lifting its share, and the door slowly goes out of balance.

How it’s fixed. On a two-spring door, we normally replace both springs together, because the other spring is the same age and usually close to failure. The springs are sized to the door’s weight and height, wound to the right number of turns, and the door is balanced so it stays put when it’s lifted halfway by hand. The cables are checked and reseated, and then the gap, the travel, and the safety reverse are checked. Spring replacement is $250 to $450 on our posted price guide. For more detail, see garage door spring replacement.

What to watch for. If a spring has broken and the door is closed, leave it closed. If it’s stuck open, don’t try to pull it down, and keep people away from under it. Read Garage Door Opens a Few Inches Then Stops in Summerlin for the symptoms that usually come with a broken spring.

Cause 6: Tracks and Brackets Out of Line

How to spot it. The door rubs or scrapes on one side, the rollers look tilted, or the door stops partway down and the opener reverses. A track may be visibly bent where a car, a bike, or a storage shelf hit it. Look at the bolts holding the track brackets to the wall. If they’re loose, the track can lean away from or into the door.

Why it happens. Doors vibrate every time they run, and brackets slowly loosen. Garages in Summerlin often double as gyms, workshops, and storage for golf carts and bikes, and tracks take knocks. Wind loading matters too. A wide door that catches strong gusts flexes, and over time that flexing can work fasteners loose.

How it’s fixed. A technician checks that the tracks are plumb and set the right distance from the door, tightens or replaces loose fasteners, straightens or replaces bent track sections, and replaces damaged rollers. The door is then run by hand and by opener to make sure it travels smoothly and closes evenly. Track work falls in our standard repair range of $150 to $350; if the door has come out of the track, off-track repair is $150 to $350. See garage door track adjustment.

What to watch for. Don’t hammer a track back into place while the door is under load, and don’t loosen the lowest track brackets, which on some doors sit close to the cable attachment. A door that is partly out of its track can fall. See Why Is My Garage Door Crooked in Summerlin?

Cause 7: A Bent Bottom Section or Seal Retainer

How to spot it. The gap is usually in the middle of the door or in one stretch, and you can see the bottom edge curve up when you sight along it. Look for a dent where a bumper or trash bin hit it, or a bottom section that bows in the heat. Long doors with thin steel skins are more likely to bow.

Why it happens. Vehicles and bins hit the bottom of the door more than any other part. On wide doors, strong sun on one face and a cooler garage on the other can make thin panels bow slightly. A retainer that has corroded, often where irrigation water splashes the bottom of the door, can lose its shape.

How it’s fixed. A bent retainer is usually replaced, and the new seal goes in at the same time. A dented or bowed bottom section can sometimes be straightened and reinforced with a strut; badly damaged sections are replaced. Matching an exact panel can be hard on older or discontinued doors, which matters in Summerlin neighborhoods with strict design rules. See bent garage door panel repair.

What to watch for. The bottom brackets that hold the cables are fastened to the bottom section. Replacing that section is a technician job.

Gaps That Appear in the Morning, and Gaps at the Sides

Summerlin’s daily temperature swing is one of the reasons homeowners notice “on and off” gaps here. Rubber and vinyl are softer when warm. A seal that’s starting to wear may still fill the floor on a hot afternoon, then shrink and stiffen overnight and leave a strip of light at dawn. Long doors also change shape a little through the day as the sun moves across them. If your gap comes and goes with the temperature, it’s an early sign that the seal is near the end of its life.

The opener’s limit can play a part too. If it’s set so the door only just reaches the floor, the small daily changes in the door and seal decide whether it touches or not. Setting the limit so the seal compresses lightly, then testing the safety reverse, usually stops the on-and-off gap.

Side and top gaps. The sides and top of the door are sealed by the perimeter weatherstrip: vinyl stop molding nailed to the door frame with a soft flap that rests against the face of the door. Sun cracks and curls that flap, and it pulls away. Replacing it fixes the gap and keeps wind-blown dust out. If the gap at one side is much wider than the other, though, the door may have shifted in its tracks or be hanging crooked, which takes us back to causes 4 to 6.

• Even light down both sides: worn perimeter weatherstrip.
• Light down one side only, door level: weatherstrip loose or damaged on that side.
• Light down one side, door looks crooked: check cables, springs, and tracks.
• Light across the top: worn header weatherstrip, or the door closing too low against the header.

What We See Across Summerlin’s Villages

Summerlin has been built in stages since the early 1990s, so homes range from about thirty years old to brand new. The patterns below are general trends we see on service calls, not rules, and any home can have any of the seven causes.

Heavier custom doors deserve a note. A wood or wood-clad door can weigh several times as much as a basic steel door, so its springs and cables carry far more load. A small cable or spring problem on a heavy door can leave a noticeable wedge gap fast, and it’s even more important not to adjust anything yourself. For an overview of service in the area, see our Summerlin garage door repair page.

What Each Fix Costs in Summerlin

These are the posted ranges from our Las Vegas garage door repair cost guide. They apply in Summerlin the same as anywhere else in the valley. The final price depends on the parts your door needs and its condition.

One visit often covers more than one cause. A new seal usually needs a small limit adjustment, and a cable repair includes balancing the springs. If the technician finds a second problem, such as a spring near the end of its life, you’ll hear about it and decide whether to do it now or later.

For a planned check before summer, a tune-up at $89 to $129 includes lubrication, a balance check, tightened hardware, a safety test, and a look at the seal. See How Much Does a Garage Door Tune-Up Cost in Summerlin?

Why Summerlin’s Climate Makes Gaps Matter More

Heat and sun. Summers in the Las Vegas Valley are long and hot, and the sun is strong. West- and south-facing doors take the worst of it. A garage with a gap under the door also loses more cool air to the outside, and in homes where the garage shares a wall with living space, that adds to the air-conditioning load.

Temperature swings. Summerlin’s higher ground on the west side of the valley tends to cool off more at night than central Las Vegas. That bigger daily swing flexes seals, and it’s why many homeowners here first notice the gap early in the morning.

Wind and dust. Spring and early summer bring strong winds, and Summerlin’s open desert edges and construction areas mean there’s plenty of dust and plant debris to blow under a door. Dust that gets in settles on rollers, tracks, and the opener’s photo-eyes. Dust is a big enough topic that we wrote a whole guide on it: Can Las Vegas Dust and Desert Conditions Affect Garage Door Tracks, Rollers and Openers?

Storms and runoff. Summer thunderstorms can drop heavy rain quickly. On sloped lots, water runs down driveways toward the garage, and a gap under the door is an open invitation. A good seal, and on some homes a threshold seal, keeps most of it out.

Pests. Bark scorpions live throughout the valley and can fit through very narrow openings, as can crickets and small rodents. A seal that touches the floor across the whole door closes one of the easiest ways in. It won’t make a garage pest-proof, but it helps a lot.

The National Weather Service in Las Vegas posts the heat, wind, and flash flood warnings worth watching. On high-wind days, keep the door fully closed rather than partly open.

HOA and Design Review Notes for Summerlin

Summerlin neighborhoods are governed by community and village associations with their own design guidelines. Most repairs that fix a gap are hidden from view: a new bottom seal, a limit adjustment, a new cable, a balanced spring, realigned tracks. Those are maintenance. Where design rules come in is when the visible part of the door changes. If cause 7 means a bottom section has to be replaced, ask whether a matching panel is available and whether the association needs to sign off. If the door is old and discontinued, a matching panel may not exist, and that can tip the decision toward a new door.

If you rent, your lease decides who pays for garage door repairs. Report the gap to your landlord or property manager with a photo, especially if the door looks crooked.

Safe Checks You Can Do Yourself

• Look at the gap. Lights off, sunny day, door closed. Note the shape and take a photo.
• Feel the seal. Soft and springy is good. Hard, cracked, flattened, or short at the corners means it’s worn.
• Check the door from outside. Is the bottom edge parallel with the top of the opening?
• Look at the springs and cables. From a safe distance, with the door closed, look for a gap in a spring coil or a slack, frayed, or loose cable. Don’t touch them.
• Clean the photo-eyes. Wipe the small lenses near the floor on each side with a soft cloth and check that the indicator lights are steady.
• Test the safety reverse. Lay a 2×4 flat on the floor in the door’s path and close the door. It should reverse after touching the board. Then wave a box through the photo-eye beam while the door closes; it should stop and reverse.
• Read the opener manual before changing any limit settings, and never turn up the force to make the door seal.

If the safety reverse fails, stop using the opener until it’s repaired.

What Happens When We Come Out for a Gap

1. Look at the gap and the door. Shape, size, and whether the door hangs level.
2. Check the seal and retainer. Profile, condition, corrosion, and length.
3. Release the opener and check balance. A balanced door stays put halfway up. One that drops or rises points to a spring.
4. Inspect cables and drums. Fraying, slack, and how each cable sits on its drum.
5. Check tracks and brackets. Plumb, spacing, fasteners, and rollers.
6. Check the floor. Slope and low spots under the door line.
7. Check the opener. Close limit, force, photo-eyes, and safety reverse.
8. Explain and price the fix. Then make the repair, recheck the gap, and test the safety reverse before we leave.

Common Mistakes With a Gap Under the Door

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• Garage Door Won’t Close in Summerlin? 10 Causes
• Why Is My Garage Door Crooked in Summerlin?
• Loose Garage Door Cable in Summerlin
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About Open Sesame Garage Door Repair Las Vegas

Open Sesame Garage Door Repair Las Vegas repairs residential garage doors in Summerlin and across the Las Vegas Valley from 7865 Bluewater Dr, Las Vegas, NV 89128. We hold Nevada contractor licence #0083315 and are open 24 hours. You can check any contractor’s licence on the Nevada State Contractors Board website. This guide draws on the gap causes our technicians find on Summerlin doors, the posted prices on our cost guide, and safety guidance from the CPSC, DASMA, and the UL 325 standard.

Call (702) 888-0842, or view Open Sesame Garage Door Repair Las Vegas on Google Maps.

Frequently Asked Questions About a Gap Under a Garage Door in Summerlin

Find Open Sesame Garage Door Repair Las Vegas

View Open Sesame Garage Door Repair Las Vegas on Google Maps · Serving Summerlin and the west Las Vegas Valley from 7865 Bluewater Dr, Las Vegas, NV 89128