Telescopic Prop Calculator | How Many Props? Height & Quantity
Telescopic prop (shore) calculator: enter slab length × width or area for approximate prop count, spare allowance and catalog height suggestion (3–6 m). Espada formwork shoring estimate.
How are telescopic props calculated?
Shoring quantity depends on slab area and grid density. Espada’s guidance rule: ceil(area_m² × 1.05), then add spare %. Working length is chosen from catalog closed–open ranges (3–6 m) for the clear height (TS EN 1065 class props).
Steps
- Enter slab area: length × width or direct m².
- Enter spare % (typically 5%).
- Enter floor height to see the suggested telescopic prop length.
- Optionally switch to another matching length.
- Open the quote sheet with “Request a quote for this product” (qty comes from the estimate).
Catalog length → adjustment range
Same closed–open ranges as Espada’s product measurement table. Lengths whose range covers the clear height are suggested; the shortest fitting length is preferred.
| Catalog length | Adjustment range | Note |
|---|---|---|
| 3 m | 1.7 m–3 m | Catalog |
| 3.5 m | 2 m–3.5 m | Catalog |
| 4 m | 2.2 m–4 m | Catalog |
| 4.5 m | 2.5 m–4.5 m | Catalog |
| 5 m | 3 m–5 m | Catalog |
| 5.5 m | 3 m–5.5 m | Catalog |
| 6 m | 3.2 m–6 m | Catalog |
| < 1.7 m or > 6 m | — | Custom size |
Formula
Count ≈ ceil(area_m² × 1.05). Order = count + ceil(count × spare%). 1.05 ≈ about 0.95 m² per prop (guidance density near a 1 m × 1 m grid).
Practical tips
- Edges, beam lines and openings need extra props on a real grid; drawing approval is required.
- Permissible load depends on extension (TS EN 1065); this is not a structural design table.
- Espada catalog lengths are 3–6 m; painted or galvanized finish is chosen on the product page.
- U or T heads depend on H20 / beam seating.
Application note
Results are guidance only. Statics, grid, head type and floor capacity are confirmed with the quote and site engineer. There is no fixed price list.
Total building budget
Prop quantity is part of the shell. For approximate building cost from gross area × official unit rates:
Frequently asked questions
How many telescopic props per m²?
Espada’s guidance rule is about 1.05 props/m² (ceil of area × 1.05). Real grids often sit between 1.0–1.5 m spacing.
How do I choose prop length?
Clear / net height must fall inside a catalog prop’s closed–open range (e.g. 3 m ≈ 1.7–3 m). The shortest length that covers the height is preferred; below 1.7 m or above 6 m needs a custom size.
How much spare should I add?
About 5% is typical for quantity. Raise it for heavy damage risk or multi-stage reuse.
Is a telescopic prop the same as a shore?
Yes — telescopic prop, telescopic shore and formwork prop name the same family. Espada lists 3–6 m painted / galvanized.
What is the load capacity in kN?
Allowable load depends on extension and TS EN 1065 class. This tool estimates count / length; use certified tables and project design for capacity.