SYSTEM 05.01 · HIGH TUNNEL CONFIGURATION
HT-420: 4.2 m high tunnel, 2.4 m at the bow.
Reference high tunnel for market gardens and season extension. Width 4.2 m, bow Ø33.5×1.8, roll-up sides, ground-screw anchors.
HT-420 is the simplest frame we quote, and the one where the details matter most. At 4.2 m wide there is no gutter and no post line: every load goes through the bow and its anchor. That is why we quote anchors as a line item rather than an accessory.
| Member | Section | Spacing | Note |
|---|---|---|---|
| Bow | Ø33.5×1.8 | 1.0–1.5 m | bent to radius |
| Longitudinal brace | Ø33.5×1.8 | mid-height | one per side minimum |
| Roll-up side | Ø33.5 + ratchet | per side | film + channel |
| Anchor | ground screw 600 mm | each leg | or concrete |
| End bow | Ø48.3×2.0 | each end | door frame |
Reference only. Wind exposure decides brace count and anchor length.
- Width
- 4.2 m
- Height
- 2.4 m
- Bow
- Ø33.5×1.8
- Bow spacing
- 1.0–1.5 m
- Sides
- roll-up
- Anchors
- ground screw
- Run
- per project
- Bows per 30 m
- 20–30
- Cover
- film or shade net
- Loading
- 40HQ
The cheapest upgrade
A second longitudinal brace and longer anchors cost a fraction of a new frame and add more storm capacity than a heavier bow. Ask for both in the first quotation.
Read next
Pages that answer the question this page raises.
- 05.05High tunnel & shade structureHigh tunnel and shade structure frames: 4.2 and 6 m bows, roll-up sides, galvanised tube, →
- 04.06.03Anchors & base platesAnchors & base plates for greenhouse frames — ground screws, concrete-in anchors, base pla→
- 08.04Wind loadGreenhouse wind load: pressure and uplift, exposure, bracing, anchors and the open-side ca→
PRICE THIS HIGH TUNNEL
Quote HT-420 bows, braces and anchors
Send the run length and wind figure. We quote the anchor and brace quantities the exposure needs, not the minimum.