Key takeaways
- Level the bottom track to within ±1 mm over its full length; a lift-and-slide panel that is out of level will drift, rub its seals and overload the rollers.
- Support the sill continuously, or with load-bearing packers at no more than 300 mm centres, because a single sash can weigh up to 600 kg.
- Install a sloped sill pan with end dams under every lift-and-slide door, and never seal its outer edge or the frame's drainage outlets.
- Fix jambs and head about 150 mm from each corner and at the centres specified by the system manual, typically no more than 600–700 mm, with a packer behind every fixing.
- A correctly installed and adjusted lift-and-slide sash should move with a hand force of under about 30 N once lifted.
Installing a lift-and-slide door correctly comes down to four controls: a square and structurally sound opening, a fully supported sill levelled to ±1 mm over its full length, a drained sill pan beneath it, and careful adjustment of rollers and locks after glazing. Get the sill wrong and nothing else can be adjusted back into tolerance.
This sequence is based on how we train distributor installation teams in Foshan for ARCVIEW's S90 and S120 lift-and-slide systems, where sashes reach 3.2 × 3.6 m and up to 600 kg. Always follow the manufacturer's manual and the project's structural and waterproofing details where they differ.
1. Check the opening before the crate is opened
Measure the opening at three heights and three widths, both diagonals, and the floor level across the full width. Compare with the shop drawing. Typical targets are an installation joint of 10–15 mm at jambs, diagonals within 3 mm of each other, and a head detail that allows for the deflection of the lintel or slab above — on long spans this can be 10–20 mm and must be confirmed by the structural engineer, because a deflecting head that bears on the frame will jam the sashes.
| Item | Typical target | How to check |
|---|---|---|
| Bottom track level | ±1 mm over full length | Rotating laser or water level at every 500 mm |
| Jamb plumb | ≤ 1 mm per metre of height | Digital level or plumb laser |
| Frame diagonals | Difference ≤ 2 mm after fixing | Tape across internal frame corners |
| Opening diagonals | Difference ≤ 3 mm | Tape before installation |
| Installation joint | 10–15 mm at jambs and head | Measure each side |
| Head deflection allowance | Per structural engineer, often 10–20 mm on long spans | Check lintel design and drawings |
| Sill support spacing | Continuous, or packers ≤ 300 mm centres | Visual check before grouting or sealing |
2. Choose recessed or surface-mounted track
A recessed track sits in a pocket in the slab so the threshold is flush with the finished floor; a surface track sits on the finished or structural floor with a low upstand. The decision must be made before the slab is poured.
| Factor | Recessed (flush) track | Surface-mounted track |
|---|---|---|
| Threshold | Flush or near-flush; step-free access possible | Upstand typically 20–50 mm |
| Water resistance | Lower; relies on external drainage channel and floor falls | Higher; upstand helps the sill resist water |
| Slab work | Rebate formed when slab is poured, with tolerance ±2 mm | Minimal; works on retrofit |
| Drainage | Linear drain outside, connected to stormwater | Weep outlets to sill pan or outer sill |
| Best for | Sheltered terraces under deep overhangs | Exposed elevations, high wind and rain |
3. Sill pan, drainage and sill support
Before the frame goes in, install a sill pan or sill membrane that runs the full width, turns up at the back (inside) edge and forms end dams that rise up the jambs by at least 100 mm. It should fall to the outside so any water that passes the frame drains out. The frame's drainage outlets must discharge onto the pan or the outer sill, never into the wall. Our waterproofing guide covers membranes and joint seals in detail.
Then build the load path. Lift-and-slide sills carry the full panel weight at the rollers, so support them continuously on a load-bearing insulated sill profile, a non-shrink grout bed, or structural packers at no more than 300 mm centres — and always directly under the interlock and the end of each track. Soft packers or foam alone will compress and the track will sag within months.
4. Fix and level the frame
- Set the sill on its supports and level it with a laser to ±1 mm over the full length. Check every 500 mm, not just the ends.
- Stand the jambs and head, check diagonals, and pack behind every fixing point so screws do not bow the frame.
- Fix about 150 mm from each corner and at the spacing in the manual, typically no more than 600–700 mm, using fixings sized for the substrate and wind load.
- Use slotted or sliding head fixings where the structure above will deflect.
- Re-check level, plumb and diagonals after fixing; a frame that was square before screwing may not be square after.
5. Handle and glaze heavy sashes
ARCVIEW glazes sashes in the factory, so on site the task is lifting rather than glazing. Plan it: a 3 × 3 m sash with laminated double glazing can exceed 300 kg. Use a glass manipulator or vacuum lifter rated well above the panel weight, glass trolleys and at least four trained people for manual moves. Keep sashes vertical on A-frames until installation. If units are site-glazed, follow the setting-block positions on the shop drawing; blocks transfer the glass weight into the frame and incorrect blocking causes sash drop.
6. Adjust rollers, lift gear and locks
Lift each sash onto its track with the handle in the open position, then adjust the rollers so the sash is parallel to the jambs and the interlock gap is even top to bottom. Adjust keeps so the handle lifts and lowers smoothly and the gaskets compress evenly when lowered. A correctly installed sash should move with under about 30 N of push force once lifted. Fit end stops and soft-close dampers, and check that the sash cannot be lifted out of the track when locked.
7. Test and hand over
- Track level, frame diagonals and jamb plumb recorded on the handover sheet.
- Operating force measured and every lock, handle and damper cycled at least 10 times.
- Drainage outlets clear; water poured into the track drains out within a few minutes.
- Field water test on a sample of doors if specified (for example AAMA 502 in North America).
- Protective film removed within the period stated in the manual, typically within weeks of installation, to avoid adhesive residue.
- Owner given the maintenance guide: keep tracks clean, lubricate as specified, and do not drill into the sill.
| Mistake | Consequence | Prevention |
|---|---|---|
| Track out of level by more than 1–2 mm | Sash drifts open or closed, seal wear, roller overload | Laser-level at 500 mm intervals before fixing |
| Soft or widely spaced sill packers | Track sags under 300–600 kg panels | Continuous support or packers ≤ 300 mm |
| Sealing over drainage outlets | Water backs up into the building | Mark outlets; inspect before final sealant |
| No head deflection gap | Sash jams when the slab above deflects | Slotted fixings; gap per engineer |
| Over-tightened jamb screws without packers | Bowed jambs, locks misalign | Packer behind every fixing |
| Lifting sashes by hand without equipment | Injury, glass edge damage | Vacuum lifter and lift plan |
For projects over 1,000 m², ARCVIEW sends an installation supervisor to site for the first openings. If you are still choosing between systems, read lift-and-slide vs bi-fold doors.
Frequently asked questions
- How level does a lift and slide door track need to be?
- The bottom track should be level to within about ±1 mm over its full length, checked with a laser or water level at roughly 500 mm intervals. Heavier panels are less forgiving: a track that falls by 2–3 mm can make a 400 kg sash drift, wear its seals unevenly and overload the rollers. Always follow the tolerance in the system manufacturer's installation manual.
- Should a lift and slide door have a recessed or surface track?
- Use a recessed track when step-free access matters and the door is sheltered, for example under a deep terrace roof, and plan an external drain with floors falling away from the door. Use a surface track with an upstand on exposed elevations facing driving rain or high wind, because the upstand gives better water resistance. The choice must be made before the slab is poured.
- How is the sill of a heavy sliding door supported?
- The sill must carry the full sash weight, up to 600 kg per panel on large systems, so it needs continuous support on a load-bearing insulated profile or grout bed, or structural packers at no more than about 300 mm centres. Add support directly under the interlock and track ends. Compressible foam or soft shims are not adequate and will cause the track to sag.
- How many people are needed to install a lift and slide door?
- Plan for at least four trained installers for large sashes, plus a vacuum lifter or glass manipulator rated well above the panel weight. A 3 × 3 m sash with laminated double glazing can exceed 300 kg, which is beyond safe manual handling. Lifting plans, A-frames and trolleys should be ready before the crates arrive on site.
- Why does my lift and slide door not close properly?
- Most closing problems trace back to installation: a track that is not level, a frame that bowed during fixing, a head that bears on the frame as the structure deflects, or rollers and keeps that were not adjusted after glazing. Check track level and frame diagonals first, then adjust rollers until the interlock gap is even, and reset the keeps.
Sources & standards
- 01Window and door installation guidance and research — ift Rosenheim
- 02RAL quality assurance for window and door installation — RAL Gütezeichen
- 03AAMA 502 field testing and installation publications — Fenestration and Glazing Industry Alliance (FGIA)
- 04ASTM E2112 standard practice for installation of exterior windows, doors and skylights — ASTM International
