A poly greenhouse usually requires a far smaller investment because the supporting structure can be lighter and the poly film itself is less expensive than glass. The lightweight roof also allows faster construction and simpler maintenance, and modern multi‑layer films give high, well‑diffused light while offering better night‑time insulation than clear glass.

In very sunny regions the diffuse additives in the film scatter harsh light and prevent sun scald, while near infrared reflecting layers keep the daytime air several degrees cooler than it would be under glass. Because the roofs are lighter, larger vents can be fitted, so natural ventilation replaces much of the energy‑hungry fan cooling that is common in glasshouses.

The entire roof fabric can roll open or closed in less than a minute, so growers cool the crop by simply removing the roof instead of running chillers or pad‑and‑fan systems. Field trials in climates similar to, for example, the GCC show that this approach can cut annual cooling energy by roughly one half to two thirds, which on a one‑hectare house translates to savings of tens of thousands of kilowatt hours.

When the roof is fully open, the plants receive the same intensity of photosynthetically active radiation as they would outdoors, and even with the roof closed Rovero’s high transmission Netfilm allows approx. eighty five percent of that light to pass through. This means that on bright days growers can maximize light without sacrificing protection when conditions turn harsh.

At dawn the grower can crack the roof open so that warm, buoyant air escapes naturally while cool night air is still present inside. This gentle venting smooths the transition from night to day, preventing the ten to fifteen degree spike that is common in sealed glass structures and protecting delicate young plants from stress.

Each of the seven layers can carry a different additive, so the film combines very high light diffusion (91%), effective infrared retention at night, a reliable anti‑drip surface and a long‑term UV warranty. The result is a roof that keeps crops cooler on hot days, warmer on cool nights and drier during periods of condensation, all while maintaining more than ninety percent transmission of useful light.

The Roll‑Air costs much less to build and far less to run, because natural ventilation replaces most of the cooling equipment and its ongoing energy bills. In practice the money saved on both construction and monthly power bills means the investment is paid back in four to six years, whereas a fully equipped glasshouse can take more than a decade to recover its cost.

Intense sun and blowing sand cause direct losses through sun scald, wind damage and abrasion, and a significant share of marketable yield can be lost or downgraded. Growers also spend extra labour washing fruit, and irrigation demand is higher because the soil surface is fully exposed.

The roof and sidewalls protect against sand, wind and sudden rain while still allowing the grower to expose the plants whenever outdoor conditions are ideal. This protection improves grade A pack out rates, extends the marketing season and reduces labor and water input compared with open‑field production.

Moderate levels of UV‑A and UV‑B stimulate natural defense compounds, strengthen the leaf cuticle and improve color development, so plants grown with controlled exposure are generally more robust and visually appealing.

Short daily doses of UV‑B can raise anthocyanin and antioxidant levels, which deepens leaf colour, enhances flavour and extends shelf‑life after harvest.

Sufficient UV promotes compact growth and vibrant pigmentation, helping growers produce sturdy, richly colored plants, while excessive UV can bleach petals, so controlled exposure under a retractable roof gives the best of both worlds.

Rovero offers more than half a century of Dutch engineering experience, patented Roll‑Air technology, premium multi‑layer cladding and dedicated support officed through there distributors that provides rapid local service and spare parts.

Across the Gulf states there are well over a quarter of a million hectares of orchards, including extensive date‑palm, mango, citrus and grape plantings, most of which are still exposed to intense sun and wind and therefore represent a large potential market for protective covers.

A poly house reduces sunburn losses, lowers irrigation demand by roughly twenty percent and often brings the harvest forward by about a week, allowing growers to market cleaner, higher‑grade fruit at better prices.

Shade halls cost less per hectare than closed houses and still lower canopy temperature by four to six degrees, cut wind bruising in half and significantly reduce damage from birds, resulting in higher marketable yield at a moderate investment level.