Ask three suppliers for the dimension of sliding door you should put on a patio, and you will get three different answers. Not because anyone is misinformed, but because the word "dimensions" is quietly doing five jobs at once. A patio sliding door has a face width, a face height, an overall unit size, a rough opening, a clear opening you can actually walk through, and a depth that disappears into the wall — and only the first two ever show up in a brochure.
This guide separates those measurements on purpose. The face sizes below are drawn from widely published residential catalog ranges and are shown only as market context, not as ALPES product data. The depth and threshold numbers are where a real system specification begins, and where most buying decisions quietly go wrong.
Across North American and Australian residential catalogs, the recurring patio sliding door face sizes cluster around a small set of values. These are third-party published ranges and will differ by manufacturer — they are a planning reference, not a specification:
| Panel layout | Common face widths | Common face heights |
|---|---|---|
| Two-panel (one fixed, one slides) | 60, 72, 96 in (1524, 1829, 2438 mm) | 80, 82, 96 in (2032, 2083, 2438 mm) |
| Three-panel | 108, 144 in (2743, 3658 mm) | 80, 82, 96 in (2032, 2083, 2438 mm) |
| Four-panel / multi-slide | 144, 192 in (3658, 4877 mm) and wider | 80 to 96 in (2032 to 2438 mm) |
A 60x80 sliding door is the size most homeowners meet first: it is the smallest two-panel unit that fits a standard rough opening and is the entry point for almost every patio replacement project. Everything larger is a wider wall and more panels.
The number printed on the box is the overall unit size — frame and all. The rough opening is the framed gap in the wall that receives it, and it is always a little larger. Published guidance typically adds roughly 1.5 to 2 inches to the width and about 1 to 1.5 inches to the height, to leave room for shimming, plumb adjustment, and insulation. One source quotes a nominal 60-inch unit needing a 61.5 to 62-inch opening; others simply say "a bit larger." The spread itself is the lesson: there is no single universal convention, so the opening is always confirmed from the specific manufacturer's drawing, never guessed from the nominal number.
Order from the nominal number alone and the door either will not ｄｒｏｐ in, or will ｄｒｏｐ in with no shim margin — which is exactly how drafts, leaks, and sticky rollers begin.
This is the number catalogs almost never print, and it is the one that decides whether your sofa and your body fit. A sliding door never opens the full width of the unit: the panels overlap at an interlock, and only the moving panel(s) clear the opening.
| Layout | Share of unit width that opens | What it means for the patio |
|---|---|---|
| Two-panel (one fixed) | About one half | Half the width is glass you can never walk through |
| Three-panel, OXO (center fixed) | About one third | One sliding panel clears; the middle is fixed |
| Multi-track stacking | About two thirds | More panels slide aside; widest clear opening |
Two rules follow. First, buying a wider unit does not buy a proportionally wider clear opening — the overlap is a fixed cost of the sliding mechanism. Second, if the patio must pass furniture or meet an accessibility path, the clear opening — not the unit width — is the number to design around.
For an alum sliding door the frame depth is where the catalog stops and the wall begins. Every sliding system occupies a specific depth from the exterior face to the interior face, set by its track count and profile. That depth must fit inside the wall assembly — the stud bay, any jamb extension, and the surrounding insulation — or the door sits proud, recessed, or simply will not close.
The real ALPES thermal-break sliding systems publish these frame-wall widths, and they are the most useful planning numbers on this page:
| ALPES system | Frame-wall width (depth into wall) | What it tells the builder |
|---|---|---|
| SL112 / 167 heavy-duty | Single or two-track 112 mm; three-track 167 mm | Shallow enough for a standard wall with a jamb extension |
| SL126 / 182 | Two-track 126 mm; three-track 182 mm | Three-track needs a deeper pocket; plan the stud bay early |
| SL155 four-track | Four-track 155 mm | Four running panels; the deepest of the range, check the wall first |
A caution worth repeating: a 2x4 wall with its standard jamb depth measures about 115.9 mm, and the SL112 two-track frame is 112 mm — the two are within a few tenths of a millimeter. That near-coincidence is pure chance (the wall number is built from stud, sheathing, and drywall; the frame number is a product depth) and it is the single most common reason a "standard" door ends up proud of the drywall. Send the wall build-up — layer by layer, outside to inside — not just a single depth figure.
The bottom track is a real dimension that decides both accessibility and water management, and it must be chosen before the slab is poured, not after. The ALPES range spans:
The trade is direct: a lower track is easier to cross and kinder to accessibility, a higher track resists water better. Changing it after the slab is set means reworking the floor — so it belongs on the drawing, not on the punch list.
"Panoramic" is a marketing word until you measure the interlock — the overlap where two panels meet and lock. A wider interlock is stronger but eats into the visible glass; a slimmer one opens the view but does less structural work. ALPES publishes slim-view options such as a 75 mm narrow edge and a 38 mm extreme-slim frame on the SL126 / 182 (75) system, and a 44.5 mm sash width on the SL155. When comparing "standard" doors, ask for the interlock width, not just the unit width — it is the number that tells you how much wall of glass you actually get.
The insulated glass unit has its own thickness, expressed as the cavity between panes — ALPES units run 24A and 27A cavities with inert-gas fills. That thickness is a depth, not a face size, and it drives the glazing rebate, not the brochure width. Heavier glass (triple or larger cavities) shifts the maximum panel width downward, because the roller and frame system must carry more weight. So "standard dimensions" for the glass and "standard dimensions" for the panel are two different specs that must be read together, never separately.
The table below maps each measurement to what it decides and who confirms it. The first five are yours to provide; the last two are confirmed by the supplier against your project:
| Dimension | Decides | Confirmed by |
|---|---|---|
| Unit width and height | Catalog face size | You, from the wall |
| Rough opening | Whether it drops in | Supplier drawing, not the nominal |
| Clear opening | Furniture and access | You, from panel layout |
| Frame depth into wall | Fits the assembly | Supplier system, you send wall build-up |
| Threshold height | Access vs water | You, before the slab |
| Interlock / sightline | Visible glass area | Supplier system |
| IGU cavity / glass weight | Max panel width | Supplier, against your glass spec |
Capture these before asking for a quote. Leave one blank and the supplier will assume — and assumptions are where patio doors go wrong:
No. "Standard" is a cluster of catalog numbers that differ by region and manufacturer. The recurring residential sizes are listed above as context; the only number that matters for your project is the one on the supplier's rough-opening drawing.
Because sliding panels overlap at the interlock and only the moving panel(s) clear the opening. Two-panel doors open about half; three-panel OXO about a third; multi-track stacking about two thirds.
Not automatically. Frame depth is a system property set by track count and profile, and it must match the wall. The SL155 four-track at 155 mm is deep because it carries four running panels; it is not "better" than the 112 mm two-track, only built for a different opening.
You can, but it shifts the water job onto the drainage path and the slab detailing. On driven-rain or pool-side sites, a higher track or a high-ｄｒｏｐ track with a water barrier is the safer default — decide it before the slab.
It changes the glass depth and, through weight, the maximum panel width — not the face width. Read the IGU cavity and the panel width as one spec, not two.
Frame depth into the wall. Face sizes are easy; the depth is what decides whether the door sits flush or proud, and it is the first thing to confirm against your actual wall build-up.
Standard sliding door dimensions for a patio are not one measurement. They are a face size, a rough opening, a clear opening, a frame depth, and a threshold height — and only the first two are printed. Send the wall build-up and the clear-opening requirement with the width, and the "standard" door stops being a guess.
