Aluminium Scissors Loft Ladder
A scissor-action loft ladder whose flat treads and interlocking side links fold into a hatch in the ceiling. Ceiling opening width and length, Room height, Stowed or unfolded
Details
Category: Loft Ladders › Loft Ladders And Access Doors
By Huu Khanh Nguyen · Updated November 5, 2026
Parameters
| Name | Default | Unit |
|---|---|---|
| Ceiling opening width | 600 | mm |
| Ceiling opening length | 1200 | mm |
| Room height | 2800 | mm |
| Unfolded | 1 | |
| Hatch width | openingWidth - 60 | mm |
| Hatch length | openingLength - 60 | mm |
| Hatch thickness | 36 | mm |
| Tread count | roomHeight <= 2500 ? 10 : roomHeight <= 2800 ? 11 : roomHeight <= 3000 ? 12 : 13 | |
| Tread pitch | 240 + 20 * (roomHeight - [2300, 2500, 2800, 3000][treadCount - 10]) / ([2500, 2800, 3000, 3300][treadCount - 10] - [2300, 2500, 2800, 3000][treadCount - 10]) | mm |
| Slope angle | Math.asin((roomHeight + hatchThickness) / (2 * 268 + (treadCount - 1) * treadPitch)) | |
| Hatch angle | slopeAngle * unfold | |
| Axis angle | 1.5707963267948966 * (1 - unfold) - slopeAngle * unfold | |
| Axis pitch | 36.2 + (treadPitch - 36.2) * unfold | mm |
| Axis length | 2 * firstOffset + (treadCount - 1) * axisPitch | mm |
| Oval pitch | axisLength / (2 * Math.ceil((treadCount + 1) / 2)) | mm |
| First tread offset | 10 + (268 - 10) * unfold | mm |
| Tread length | openingWidth <= 550 ? 240 : openingWidth <= 650 ? 300 : 380 | mm |
| Oval width | (innerWidth - treadLength) / 2 | mm |
| Ladder pivot | -innerLength / 2 + 100 | mm |