Oct 30, 2026
IndexBox projected in June 2026 that global polycarbonate greenhouse sheet would grow at about 6.8% CAGR through 2035 — ahead of the sheet market overall. The logic is straightforward: climate variability raises the risk premium on open-field production, pushing investment toward protected and controlled-environment agriculture, while older film and glass covers reach replacement age.
Fast growth also means a crowded market full of sheets that look identical. The first step in selection is not asking for a price — it is fixing the four parameters below.
1. Light transmission
New transparent 8 mm twin-wall typically transmits around 80%. Ask whether that figure is for virgin resin with double-sided UV, or for sheet with regrind content. The difference is invisible for two years and obvious from the third.
2. U-value
Lower is better insulated. Commonly published ranges (check the datasheet for the exact figure):
• 8 mm twin-wall: about 3.0–3.5 W/(m²·K)
• 10 mm twin-wall: about 2.9–3.2 W/(m²·K)
• 16 mm triple/multiwall: about 2.2–2.6 W/(m²·K)
Lower is not automatically better. Each added layer costs five to ten percentage points of light transmission. High-light regions should prioritise transmission; cold regions should prioritise insulation. That single choice frames the rest.
3. Condensation and drip
With a large inside-outside differential, condensation on the inner walls of the flutes is normal. Water dripping onto foliage invites botrytis. Two fixes: specify an anti-drip (hydrophilic) coating, and install at a minimum 5° slope so condensate runs off. Slope is more reliable than coating — use both.
4. Snow and wind load
Calculate from local 50-year snow and wind loads, not from habit. Permissible span varies with thickness, structure and fixing method; always read the load-span table for the exact product. Over-spanning causes sag, ponding and eventual collapse — the most common failure mode in greenhouses.
|
Scenario |
Recommended spec |
Why |
|
Temperate, spring–autumn cropping |
8 mm twin-wall, clear |
Best balance of cost, insulation and transmission |
|
Winter below -5°C, year-round production |
10 mm twin-wall or 16 mm multiwall |
Lower U-value, less heating energy |
|
High light, hot summers |
8 mm twin-wall + diffused (opal) |
Scattered light reduces leaf scorch, evens distribution |
|
Propagation / tissue culture |
16 mm multiwall + anti-drip |
Stable temperature and humidity, no dripping |
|
Coastal, high wind load |
10 mm twin-wall, reduced post spacing |
Wind resistance first, conservative spans |
1. Thermal expansion allowance. PC expands at about 6.5 × 10⁻⁵/K. A 6 m panel moving through a 60°C range grows roughly 23 mm. Slotted holes at both ends; never fix screws rigid.
2. UV face outward. The co-extruded UV layer sits on one side (or both, if specified). Installed backwards, it offers no protection and the sheet yellows within two years.
3. Sealing and breathing. Use the correct closure profiles — breather tape on multiwall to stop dust and moisture entering the flutes — not ordinary tape as a long-term substitute.
Get these right and an 8 mm sheet will run beyond ten years outdoors. Get them wrong and you will replace it in three. Installation quality affects service life more than the grade difference between two sheets.
Our multiwall range covers 4–20 mm twin-wall and multiwall structures in clear, opal diffused, blue and bronze, with optional anti-drip and flame-retardant grades, plus U-profiles, edge trims, screws and sealing accessories. For greenhouse enquiries we start with three inputs: location, house type (tunnel or Venlo) and local snow load. With those, the specification usually lands in one pass.
Send your greenhouse dimensions and location and we will return a specification with span guidance and an accessory list.
How much more do 10 mm sheets cost than 8 mm, and is it worth it?
10 mm carries a higher price per square metre, but the case rests on insulation. Where heating is required, the energy saving typically covers the difference within two to three heating seasons. In frost-free regions, 8 mm is the better buy.
How long does a multiwall greenhouse cover last?
With correct installation — UV face out, expansion allowance, proper closures — virgin resin sheet with double-sided UV commonly runs beyond ten years outdoors. Actual life depends on UV intensity, chemical exposure (ammonia or sulphides nearby) and cleaning method.
Do diffused sheets reduce yield?
Generally the opposite. Scattered light reaches lower leaves through the canopy, reduces scorch and evens distribution. In high-light regions the yield gain from diffusion usually exceeds what extra transmission alone delivers.
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