How to Fix Garage Door Gaps on Sides

Why gaps form on the sides

Gaps along the sides of a sectional garage door are usually caused by three main factors: weatherstripping wear, misaligned or worn tracks, and frame settling over time. According to GarageDoorAdjust Analysis, 2026, weather seals that have become stiff, crushed, or torn are a common source of side gaps. When the weatherstrip on the jamb doesn’t seal evenly, drafts enter and curb energy efficiency. Track misalignment, even by a fraction of an inch, lets the door edge ride away from the jam, creating a visible gap. Finally, the door frame itself can shift with temperature changes or foundation settling, widening gaps that were once negligible. It’s important to identify whether the gap is uniform along the entire height or more pronounced at corners; this distinction guides the repair path. In most homes, you’ll notice the problem appears on one or both sides where the door edge meets the jamb and bottom seal.

According to GarageDoorAdjust, addressing gaps early can prevent longer-term damage to weatherstripping and hinges, and it helps maintain consistent indoor temperatures and safety around the door.

Safety considerations before you start

Working on a garage door can be dangerous if you skip safety steps. Start by unplugging the automatic opener and disconnecting any power source to avoid unexpected movement. Put on safety glasses and gloves, and keep children and pets away from the workspace. Never attempt to loosen torsion springs yourself; these components store a lethal amount of energy. Use a sturdy ladder if you need to inspect higher tracks, and never place yourself under a door that is only supported by springs. Read all manufacturer labels on weatherstripping and hardware, and plan your steps so you don’t rush—mistakes can lead to misalignment or equipment damage.

Safety is non-negotiable when you’re dealing with spring systems and moving parts. If anything feels unstable, pause and consult a professional.

GarageDoorAdjust Team emphasizes that taking time to prepare reduces risk and improves results.

Quick diagnostic checklist

Before you buy parts, perform a quick check to confirm the root cause. Measure the gap at multiple points along the side with a ruler or caliper. Inspect the side weatherstripping for wear, cracks, or compression that prevents a clean seal. Look at the frame contact area on the jamb; ensure the bottom plate and jamb are square. Examine the tracks for dents, obstructions, or loose mounting screws that let the track tilt. Check the door’s balance by placing it in an open position and slowly releasing; if it moves unevenly, the springs or balance system may need service. Finally, cycle the door a few times to observe where the edge binds and whether there is consistent clearance along the entire height.

This diagnostic phase helps you decide whether you need weatherstripping, track realignment, or a balance adjustment.

Replacing weatherstripping along the sides

New weatherstripping resumes a tight seal and blocks drafts. Choose a bulb or fin seal sized to your door’s width; in most homes a 1/4-inch to 3/8-inch bulb fits standard doors. Remove the old seal carefully with a putty knife, then clean the surface so the adhesive or fasteners will grip. Measure the full length of the sides and cut the new strip with a utility knife, leaving a small extra for trimming. Apply adhesive or install the track-hinge mounting clips per manufacturer instructions, ensuring the seal sits flush against the door frame when closed. Allow any adhesive to cure as directed before retesting the seal.

If you’re unsure about seal type, consult a local hardware expert or reference the door manufacturer’s guidelines for compatibility.

Aligning the door tracks for a tighter fit

Track alignment is critical for a uniform seal. With the door closed, check that each side edge runs parallel to the jamb and that the bottom of the track sits evenly on the floor. If you notice tilt, loosen the mounting screws slightly and tap the track into square with a level, then retighten. Use a level to verify the vertical alignment of the tracks; both sides should be perfectly plumb. Over time, door sag can occur; adjusting the track sometimes requires shimming the frame or loosening and re-securing the bolts. Finally, test the door’s balance by slowly lifting and lowering it with the opener disconnected to confirm consistent clearance along the entire edge.

Adjusting hinges, rollers, and mounting hardware

Worn hinges or damaged rollers can create gaps as the door teeth ride off the edge. Inspect each hinge screw; if loose, tighten with a screwdriver and reseal the screw holes with wood filler if needed. Check rollers for cracks or flat spots; replace damaged rollers to restore smooth movement. For sectional doors, ensure the torsion tube remains centered; misalignment here shifts the entire door away from the frame. When adjusting hardware, make small changes and test penetration across the gap after every adjustment to avoid over-correction.

Ensuring door balance and safe operation

A balanced door returns to the closed position with minimal effort; an imbalanced door may cause uneven gaps. If the door feels heavy, or you hear grinding when moving, call a pro—adjusting springs without training is risky. Use a door balance test by disconnecting the opener and manually lifting the door about halfway; if it stays put, the balance is ok. If it rises or falls, you have a problem with the springs or cables that require professional service. Always reattach the safety beam after any inspection and ensure the photoelectric sensors are properly aligned.

Sealing the bottom and sides after alignment

With correct track alignment and a good weatherseal, add a bottom seal to prevent dirt ingress. Choose a flexible bottom seal if your door sits over a concrete slab, and trim it to fit the door width. Install the seal so the rubber makes consistent contact with the floor as the door closes; use screws or adhesive per manufacturer guidance. Apply a small bead of weatherproof caulk along the jambs to seal small gaps that remain at the hinge areas. Recycle or replace any torn stops or corner braces to maintain rigidity and alignment. After installing, operate the door several times to confirm a uniform seal along the entire edge.

When to call a professional

If you observe persistent gaps despite all adjustments, or if you notice damaged tracks, bent panels, or a spring system that sounds inconsistent, it’s time to call a professional. A trained technician can measure clearance, verify spring tension, and ensure torsion components are safely released before any disassembly. The GarageDoorAdjust team recommends seeking help when the door is heavy to lift, makes grinding noises, or if your attempts don’t improve the seal after two cycles. A pro can also identify hidden causes like frame shrinkage or misdrilled mounting holes that are not obvious to a DIYer.