Timber Folding Loft Ladder
A sectional folding timber loft ladder that unfolds through a framed ceiling hatch with an insulated lid. 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 - 56 | mm |
| Hatch thickness | 36 | mm |
| Ladder run | 0.43 * roomHeight | mm |
| Ladder length | Math.sqrt((roomHeight + hatchThickness) ** 2 + ladderRun ** 2) | mm |
| Deploy angle | Math.atan2(roomHeight + hatchThickness, ladderRun) * unfold | |
| Section count | Math.ceil(ladderLength / (innerLength - 20)) | |
| Section length | ladderLength / sectionCount | mm |
| Treads per section | Math.round((sectionLength - 2 * 125) / 250) + 1 | |
| Tread pitch | (sectionLength - 2 * 125) / (treadsPerSection - 1) | mm |
| Ladder width | openingWidth >= 600 ? 340 : 300 | mm |
| Fold angle | 180 * (1 - unfold) | ° |