A glazing schedule may give the total area, but stillage planning needs the individual items. Their dimensions, thickness, weight and quantities determine the constraints that the rack has to accommodate.
Take an illustrative monolithic glass panel measuring 1.0 m by 1.8 m with 8 mm glass thickness. Using an approximate glass density of 2,500 kg per cubic metre gives a weight of 36 kg. A rack with a net payload of 1,000 kg is limited to 27 such panels by weight.
The available depth may impose another limit. With 700 mm of usable depth and 15 mm separation between panels, the depth calculation permits 31 panels. The lower limit is therefore 27, and 40 panels require two racks under this simplified, single-item-type approach.
| Input | Assumed value |
|---|---|
| Panel | 1,000 × 1,800 × 8 mm |
| Approximate glass weight | 36 kg per panel |
| Net payload | 1,000 kg |
| Depth and separation | 700 mm and 15 mm |
| Limiting capacity | 27 panels by weight |
| 40 panels | 2 stillages |
Indicative arithmetic only. Actual rack ratings, support and restraint require supplier confirmation; each item type is packed separately.
Windows and doors need their actual weights
A glass-only density calculation does not establish the weight of a framed window or a complete doorset. Use the supplier’s product weight and the actual packing thickness.
Also check the permitted dimensions, support arrangement and restraint requirements. The calculation is a logistics allowance, not approval of a loading arrangement.
Once the rack count is established on an agreed basis, hire duration and transport can be priced separately. This makes programme changes visible: extending hire by two weeks affects a different part of the estimate from increasing the number of units.
The schedule is the starting evidence. The rack supplier’s limits determine whether the assumed arrangement is usable.