TECHNICAL 01 · SPECIFICATION
Eleven inputs, and a frame quotation that can actually be built.
Most enquiries arrive as “8 m span, 1,000 m², price please”. That is enough to give a number and not enough to give a frame. These eleven inputs turn a price into a purchase order that the mill, the loader and the site crew can all work from.
The list is ordered by how much it changes the price. The first four usually move the quotation by more than 30 %; the last four decide whether the container arrives complete.
| # | Input | Why it matters | Typical form |
|---|---|---|---|
| 1 | Covered area and shape | Sets quantities and the loading plan | m², plus length × width |
| 2 | Span and bay | Sets arch and gutter sections | 8.0 m × 4.0 m |
| 3 | Eaves / gutter height | Sets post length and bracing | 4.5 m |
| 4 | Load case | Sets wall thickness and spacing | snow kg/m², wind m/s |
| 5 | Covering | Sets purlin spacing and clips | 150 μm film / 8 mm PC / 4 mm glass |
| 6 | Vent pattern | Sets vent hardware and purlin gaps | ridge + side roll-up |
| 7 | Crop support | Sets rails, wire and bench loads | high wire at 4 m |
| 8 | Coating | Sets process and price | Z275 pre-galv / hot-dip |
| 9 | Fittings scope | Sets the BOM | frame only, or frame + clips + doors |
| 10 | Packing and marking | Sets bundle plan | nested, cut to bay, marked A/B/C |
| 11 | Documents | Sets what clears customs | mill cert, PL, invoice, CO |
Numbers 1–4 are the price drivers. Numbers 9–11 are the delivery drivers. Both matter.
What we do when an input is missing
We state the assumption we would have made, mark it in the quotation, and quote with it. That way the number is usable immediately and the assumption is visible. We do not silently pick a snow load, because a snow load is a design decision.
The one input we will not fill in
The design load case. If you do not have a snow or wind figure, we will quote a reference case and say so in writing — but the structure you build must be signed off by an engineer who knows your site.
A worked example
- Area
- 1,000 m² (25 × 40 m)
- Span / bay
- 8.0 m / 4.0 m
- Eaves
- 4.5 m
- Load
- snow 15 kg/m², wind 100 km/h
- Cover
- 150 μm film, ridge + side vent
- Support
- high wire rails at 4.2 m
- Coating
- Z275, cut ends touched in
- Scope
- frame + clips + 2 door sets
- Packing
- nested, 4 m cut, marked
- Docs
- mill cert + PL + invoice
- Delivery
- FOB Tianjin
- Quotation
- 3–5 working days
- Drawing
- with the quotation
- Lead time
- 20–28 days
Read next
Pages that answer the question this page raises.
- 08.02Span, bay, eavesHow span, bay and eaves height affect greenhouse frame sections, weights and cost. Design →
- 08.03Snow loadGreenhouse snow load: ground snow load, shape and exposure coefficients, EN 1991-1-3 and E→
- 08.04Wind loadGreenhouse wind load: pressure and uplift, exposure, bracing, anchors and the open-side ca→
- RFQ builderBuild a greenhouse frame RFQ: select tube, profiles, gutters and system lines, add project→
NEXT STEP
Turn this into a quoted frame list
If this page answered the technical question, the next step is a number. Send the parameters and we will price the tube, profiles, gutters and fittings as one package.