Under-Roof Screen.

A pitched / sloped roof consists of several components: the structure , the insulation, the protection under the roof, the ventilation of the roof space , the roof covering, the water drainage system and apertures.

What is a screen underlay?

Although only recommended by regulations in many cases, the roofing screen strengthens the protection afforded by the roof. Indeed, the roof screen can:

• protect the structure against the ingress of snow
• prevent dust, pollen, sand from entering
• prevent small animals from entering the attic
• avoid the roof covering rising with the wind
• improve the ventilation of the roof

Types of screen underlay

There are four main types of screen underlay:

• Bitumen sheets. This is a very traditional method, but also heavier. It provides a good seal and good wind resistance.
• Synthetic micro-perforated film. This is lightweight and quick to install, but it is less permeable to water vapor, and should be well ventilated.
• Vapor Permeable Roof screens (VPR). A newer type of screen which is placed directly over the insulation, breathable and adaptable to all types of roofs.
• Reflective screen. It blocks the infrared rays and reflects them into the air gap formed in front of it, forming a thermal barrier which completes the insulation. In addition to having all the same properties as a traditional screen the reflective screen can be bituminous, which offers flexibility and long life, and breathable.

Ecological sub-roof screen

There is also now a variety of green underlay screens made from eco-friendly materials, not created from products of the petrochemical industry as in the case of many traditional roof screens.

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