What Brand Is My Sliding Glass Door, and What Rollers Does It Take?

Two questions come up before almost every roller job: what brand is this door, and what roller does it take? You can answer both with a flashlight and a tape measure, and you never need to lift the panel. Here is where to look, and the two photos that let us bring the right parts the first time.

Where the brand name hides

1. A label on the frame or the panel edge

Open the door and look at the exposed edge of the sliding panel and the inside face of the frame near the top corners. Vinyl doors from the 1990s on usually carry a sticker with the maker, a series name and often a date. Milgard labels its panels this way, and so does Anlin. On 1960s to 1980s aluminum doors the sticker is long gone, though some makers stamped a name into the sill or head channel.

2. The handle

Many makers put their name on the handle set: molded into the pull, printed on the thumb latch or on the face of the lock. Milgard and Andersen hardware often carries the name. A handle with no name is usually a hardware-store replacement and tells you nothing about the door.

3. The glass corner

Every pane in a patio door is tempered safety glass, and tempered glass carries a small etched mark in one corner. The etch names the glass fabricator and the safety standards it meets. Sometimes the door maker’s name is etched beside it; Milgard does this on many doors. An unfamiliar glass company name is the fabricator, not the door brand.

4. A certification sticker on newer doors

Newer doors were sold with an NFRC energy label, the large paper sticker with U-factor and solar heat gain numbers, and that one usually came off at install. A small permanent certification sticker often stays on the frame edge and names the manufacturer.

Vinyl, aluminum, wood or fiberglass

The frame material narrows the brand list more than anything else.

Vinyl. White, tan or painted outside. The corners are welded, so there is a thin diagonal seam across each corner. It feels slightly warm and sounds hollow when tapped. Milgard, JELD-WEN, Anlin and the Pella 250 and 350 Series are vinyl.

Aluminum. Thin frame, cold to the touch, and it rings when tapped. The corners are screwed or mitered, not welded. Old tract doors are mill silver or bronze anodized. Fleetwood doors are aluminum too, but heavier, with thicker glass, a smoother finish and stainless hardware.

Wood. Visible grain or a thick painted stile inside, and a heavy panel. Andersen Perma-Shield and Frenchwood gliding doors have a wood core with a vinyl or fiberglass skin, so you see wood inside and a smooth skin outside. Pella Lifestyle and Architect are wood lines.

Fiberglass. Looks like painted vinyl but does not flex when pressed, and the corners are joined, not welded, so there is no diagonal seam.

Reading the roller from the bottom corner

Open the door halfway and shine a flashlight into the bottom corner of the sliding panel, where a steel roller housing sits in a pocket at each end of the bottom rail. Three things about it tell us which replacement fits.

Where the adjustment screw is. On most doors it sits on the face of the bottom rail near the corner, often under a small plastic plug. On others it is in the end of the panel. The replacement housing must use the same adjustment style.

Tandem or single. Look through the cutout in the bottom of the rail. Two small wheels in a row is a tandem roller; one wheel, usually larger, is a single. Vinyl doors from the 1990s on are nearly all tandem. 1960s to 1980s aluminum doors are often single.

Wheel size and edge. The common diameters are 1-1/8, 1-1/4 and 1-1/2 inches. A 1-1/4 inch tandem with concave steel ball-bearing wheels is the usual find on Milgard and most vinyl doors; 1-1/2 inch wheels turn up on heavy aluminum doors such as Fleetwood and old Arcadia; 1-1/8 inch on lighter vinyl and some aluminum. Parts makers also sort housings by the tab on the back, so the housing photo matters as much as the wheel.

How to measure without removing the panel

None of this involves lifting or pulling on the panel.

1. With the door closed, measure the gap between the bottom of the sliding panel and the sill at each end.
2. Open the door halfway and measure the thickness of the panel at the bottom rail.
3. Measure from the adjustment screw to the end of the panel.
4. Hold the tape across the cutout in the bottom rail and read its length. A tandem cutout is noticeably longer than a single.
5. Run a finger along the rail the wheel rides on. A rounded ridge means a concave wheel; a flat rail means a flat wheel. Shavings or a scalloped rail mean the track needs a cap along with the rollers, as our roller warning signs guide explains.

Those numbers get us to one or two candidate rollers before we arrive. The exact match is confirmed once the panel is out, which is part of every roller replacement.

What San Diego doors usually turn out to be

The era of the house and its distance from the ocean usually predict the door.

In Clairemont the original 1960s and 1970s aluminum slider is still in a lot of homes, rollers and rail the same age. In Carmel Valley the answer is almost always a white vinyl Milgard tandem. Within a few blocks of the water in La Jolla, salt air has usually pitted whatever steel is under the door, which is why the stainless versus standard rollers guide matters there more than the brand. Every brand and type we work on is on the doors page.

The two photos that let a technician identify it

Photo one: the bottom corner of the open sliding panel. Take it from low down with the flashlight on, so the adjustment screw or its plug, the cutout and the wheel are all in frame. Lay a tape measure along the bottom rail if you can.

Photo two: the brand clue. The label, the handle or the glass etch, whichever you found. If you found none, shoot the whole door from inside with the track and a frame corner visible.

If the door grinds or drags, a third photo of the rail where the wheel runs tells us whether to bring a stainless track cap as well. Our hard to slide page shows what a worn rail looks like.

Next step

Send the two photos with a quote request and we will tell you the brand, the roller the door most likely takes, and the per-door price for roller replacement before we come out.