Sliding glass doors that grind, stick or will not lock

Quick answer

A dragging slider usually needs a clean track and new rollers. Try the adjustment screws first; worn rollers, damaged tracks and heavy panels are a two-person repair.

Mid-century houses on Monterey Park's hills were designed around the view. Many from the 1950s and 1960s have a wall of glass at the back, with an aluminum or steel-framed sliding glass door opening onto a deck, patio or yard that steps down the slope.

Those doors get used every day, carry a lot of weight, and sit in direct sun and wind. Sooner or later, most of them start to drag.

This guide covers why sliders get hard to move, what you can clean and adjust yourself, and what our repair visit involves.

Symptoms we hear about

• You need two hands, or a shoulder, to open the door
• A grinding or scraping sound as it slides
• The door jumps or wobbles in the track
• The latch will not line up with its catch, so the door cannot lock
• Daylight or drafts around the closed door
• The screen door falls off its track or will not roll

Why sliders drag

Worn rollers. Under the bottom of the moving panel are two roller assemblies. Over years of use, the wheels flatten, crack or lose their bearings, and the door ends up sliding on metal instead of rolling.

A damaged track. The raised rail the rollers ride on can get dented, corroded or worn down. A rough or bent track chews up new rollers quickly.

Dirt and debris. Hillside lots mean wind-blown dust, leaves and grit, and the bottom track of a slider collects all of it.

Settling. On a hillside, a house can shift slightly over the decades. If the opening goes out of square, the door rubs at the top or misses the latch even when the rollers are fine.

Heavy glass. Replacement dual-pane glass is heavier than the original single pane, which wears rollers faster.

What you can do yourself

If the latch does not catch, the strike on the jamb often has slotted screws that let it move up or down.

When to call us

• Cleaning and adjusting did not help
• The rollers are visibly broken or seized
• The track is bent, broken or worn through
• The door has come off its track
• The latch or handle is broken
• The glass is cracked, or the panel is too heavy for one person

Lifting a sliding glass panel out of its frame is a two-person job. Large panels are heavy and awkward, and dropping one is dangerous.

Picking replacement rollers

Roller assemblies are not universal, even when two look alike. Before ordering, we measure the housing length, the wheel diameter, and whether the wheel is steel, nylon or a sealed ball-bearing type. Steel wheels last longest on a stainless track cap.

Nylon wheels are quieter but wear faster under heavy dual-pane glass. If you want to shop for parts yourself, pull one assembly out first and take it with you, or photograph it next to a ruler.

What our slider repair involves

We lift the moving panel out of the frame, usually by raising the rollers fully and tipping the bottom out. With the door on padded supports, we remove the old rollers and match replacements to the door's make and profile. Roller assemblies vary a lot by manufacturer, and older mid-century doors sometimes need a compatible universal assembly.

We inspect the track. Minor dents can be straightened, and a worn rail can be covered with a stainless steel track cap that gives the new rollers a smooth surface. Then we reinstall the panel, adjust it so it rolls easily and sits evenly against the jamb, and align the latch and strike.

If the handle or lock is broken, we replace it with a compatible set. We also check the weatherstripping along the edges, which on older doors is often flattened or missing; see our weatherstripping page. And if the screen door is part of the problem, we can repair or replace it at the same visit; see screen and security doors.

About older steel sliders

Some mid-century homes have original steel-framed sliders. They are slim, elegant and worth keeping, but parts can be hard to find. We can often clean, adjust and rebuild what is there, and source compatible rollers where the originals are gone.

Settled openings

If a door rubs at the top corner, or the gap between the door and the jamb is uneven top to bottom, the opening may have gone out of square. Small differences can be taken up with roller adjustment. Larger ones may point to settlement worth having evaluated, especially if you also see new cracks in drywall or stucco nearby.

Keeping it rolling

Vacuum the track every few weeks, especially in the dry, windy months. Keep a doormat outside rather than inside the track. Open the door with the handle, not by pushing on the glass.

And deal with a slider when it first starts to grind, since worn rollers damage the track if you keep forcing the door.

Text a short video of your slider opening and closing to (626) 684-3505, and we will tell you what we think it needs. More on our door repair page.

After a slider repair up in the hills, we usually head down to NBC Seafood on Atlantic Boulevard for a dim sum lunch.

Want us to handle it?

Call or text (626) 684-3505, Mon–Sat, 8:30 AM–7 PM. Send a photo and we will give you an upfront quote.

Call or text (626) 684-3505