Design

Verandas and glass roofs: protecting yourself from the sun

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DR

Beware of overheating ... This is the recurring problem of verandas and glass roofs. Whew, solutions exist ...

Nothing to do, it is from the top that the sun penetrates the most generously inside a glass roof or a veranda. And in summer, the heat quickly becomes unsustainable if the problem was not considered during the design. In some areas, it is even better to forget about the glass roof, even if it is an appreciable opening on the landscape, and to choose an opaque material offering better thermal insulation. The veranda then becomes a simple extension adopting the same roofing material (flat tiles or channel, slates, etc.) as the house. Or we opt for other traditional materials (copper or zinc for example that adapt to very low roof slopes (from 5%) Disadvantage, and size: this choice (inapplicable in essence to a glass roof !) removes from the veranda much of its appeal, namely brightness.

Worse, the rooms adjoining the veranda are also darkened, unless a sophisticated cover alternating glass spans and roof windows (Velux) to enjoy the light while weighting overheating.

REGULATE NATURALLY TEMPERATURE

The "provençal well" (or Canadian well) is an old ventilation device that allows you to enjoy the coolness or the warmth of the ground to cool or heat the renewal air.
The principle is simple. An underground conduit, buried about 2 m deep, brings the outside air into the house. This is cooled or preheated by passing through the soil (about 13 ° C), cooler (in summer) or warmer (in winter) than outside air. This system can lower or increase the indoor temperature by a few degrees.

On the Internet: www.construire-sain.com, www.maison-solaire.com, www.futura-sciences.com.

The solution: blackout blinds

On the roof (it is called zenithal occultation) as in front, the blinds can reduce the onslaught of the sun.

Exterior blinds are the most effective solution since they stop the UV before they reach the glazing. They avoid to transform verandas and glass roofs in tropical greenhouses. Most models can be motorized and some are equipped with an overflow creating a shadow area in front of the veranda, further improving performance. The tension of the fabric is automatically ensured by a spring mechanism incorporated in the load bar.

The blinds are made of acrylic fiber, microperforated canvas, but also in the form of adjustable aluminum blades, single or double wall with polyurethane foam for the most efficient. Disadvantage: Even when rolled up, the canvas models are subject to the elements and their life is affected (the most sophisticated models are wrapped and protected in a formwork). In addition, a well-programmed automatic control can significantly extend their life. Last defect: this style of blinds is only suitable for veranda roofs of simple shape (square or rectangular).

TO NOTE

A solution to be envisaged during the construction: to call on a specialist to size well (length and diameter of the pipe, depth, hygiene, etc.).

The interior blinds are, they, more adapted to the forms of less traditional veranda. The most efficient blinds have a reflective aluminized surface. The heat is returned and dispersed outside, and the freshness is preserved inside the veranda. Less exposed to bad weather, the materials are different and more varied: polyester fabric with mirror face, woven wood, aluminum slats ...

Façade blinds: like blinds with zenith blinds, they can be external or internal and are made of the same materials. Note also the existence of shutters integrating the gutter of the veranda and are therefore more discreet. Roller shutters help cool the room on sunny days and keep it warm during the winter, while protecting it from burglary attempts in case of prolonged absence

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