Best Practices for the Installation and Maintenance of Greenhouse Films

Greenhouse film covers are essential components in modern horticulture, offering controlled environmental conditions that enhance crop quality and yield. However, their performance and longevity depend significantly on how they are installed, maintained and used. This guide provides best practices based on both general standards and recommendations to help growers maximize the life and effectiveness of their greenhouse film.

A. Selecting the Right Film

Plastika Kritis’ greenhouse films are manufactured using premium raw materials, advanced UV stabilizers and antioxidants, ensuring superior mechanical strength, enhanced resistance to degradation and environmental stress and an extended operational lifespan, resulting in reduced replacement frequency and improved cost-efficiency over time. 

Before installation, select a film that suits your greenhouse structure, climate, and crops:

Functional Additives: Consider films with anti-drip, UV-blocking, or light-diffusing properties based on crop needs.
Layer Configuration: For areas with harsh climates, double-inflated film layers may improve insulation and reduce energy costs.
Chemical Resistance: If you plan to use chemicals like sulphur fumigants, choose films specifically stabilized for such environments (e.g., HALS- or nickel-stabilized films). 

B. Pre-Installation Preparation

Proper site and frame preparation are crucial for a successful installation:

Frame Condition

Ensure metal tubes are clean, rust-free, and ideally hot-galvanized.
Remove sharp edges and replace rusted wires.
Clean and inspect all contact points to prevent damage to the film.
Film Storage

Store film in its original packaging in a shaded, cool location.
Keep it horizontal and away from direct sunlight to avoid degradation before use.
Inspection

Before installation, check for transport-related damage, especially on the edges.

C. Installation Guidelines

1. Weather Conditions

Install the film during mild, calm weather, ideally at temperatures 10°C - 22°C (50°F – 72°F).
2. Tensioning and Securing

Film must be tensioned tight enough to prevent flapping but not overstretched.
Over-tightening can reduce elasticity and lead to tearing in cold conditions.
Use ropes, slats, arches, and clips in good condition. Support elements should be spaced no more than 1,5 meters apart in windy areas.
3. Considerations

Avoid direct contact between the film and PVC components, which can release plasticizers that degrade the film.
In double-inflated greenhouses, maintain consistent air pressure between layers to retain optimal tension.  

D. Ongoing Maintenance

Proper care extends the film's effectiveness and protects your investment.

1. Protective Measures

Apply white acrylic, water-based paint (or protective tape) on areas where the film contacts metal to prevent localized overheating. Oil-based paints must be avoided.
Regularly inspect tensioning ropes or belts and re-tighten as needed.
2. Damage Control

Promptly repair any tears with special greenhouse adhesive tape, never use PVC tape.
Re-stretch the film if water pockets form or after high winds.
3. Special Care During the Summer

Use shading materials that do not contain harmful chemicals.
Ensure proper application to avoid damage to the film’s surface.
4. Proper ventilation 

Good airflow is essential
Reduce heat built up and prevents excess humidity
5. Cleaning and maintenance 

Wash films regularly with water to keep clean from dust, algae and chemical residues to prevent degradation
Clean films allow more light inside the greenhouse to maximize crop growth

E. Chemical Use Considerations

Chemicals can accelerate film degradation if used improperly.

Avoid pesticides and fumigants with sulphur or halogen derivatives near the film.
After chemical applications, ventilate the greenhouse thoroughly.
Never direct inflator turbines toward crops where chemicals are applied. Use external air between layers in double-film systems.
Choose resistant films if heavy fumigation is expected.
During soil disinfection, always use impermeable VIF/TIF films to prevent film contamination.
When the use of sulfur cannot be avoided Plastika Kritis’ solutions SulfurSafe® films with HALS (up to 5.000ppm resistance) or Nickel Quencher (unlimited resistance) stabilizers can withstand the intensive sulfur use without degradation; stable light and UV performance.

F. Special Film Features and Usage Tips

Anti-Dripping Films

Ensure the correct side of the film faces the ground.
Roof pitch should be at least 30° to enable the anti-drip function.
Consider reducing or repositioning support wires to prevent water droplets from falling directly on crops.
If mist develops under anti-drip films during early mornings or evenings, increase heating or ventilation.
In less ventilated structures, use films with anti-mist properties.
EVO AC® 8-layer greenhouse films offer anti-drip and anti-mist performance that does not degrade over time and offers best-in-class humidity management. It also helps optimize light transmission, reduce mist, and create ideal greenhouse conditions for superior results.

UV-Blocking Films

UV-Blocking films up to 380nm limit insect attraction and fungal sporulation offering reduced pest pressure and virus spread; better flower quality (e.g., avoids rose petal blackening).

Effectiveness varies with pests, diseases, and growing conditions.
Test UV-blocking films before large-scale use, especially when:Using bumblebees or beneficial insects
Growing crops dependent on color quality (e.g., eggplants, red salads)

G. Common Mistakes to Avoid

Installing during windy or extreme weather.
Ignoring structural defects or rusty components.
Skipping protective measures on metal contact points.
Using unsuitable chemicals or placing fans near fumigated areas.
Incorrectly orienting specialized films (e.g., anti-drip upside down).
Conclusion

Proper installation and maintenance of greenhouse film covers ensure durability, reduce replacement costs and enhance crop productivity. By following the detailed practices outlined above, ranging from site preparation and correct installation techniques to chemical precautions and ongoing care, you can significantly extend the life and effectiveness of your greenhouse films.

Author: plastikakritis.com