TERREAL’S ventilated terracotta walls offer aesthetic and technical advantages with their:
- large variety of formats, shades and types of joints (open or closed), depending on the fixing system,
- strong performance in terms of resistance to wind and impacts; sometimes increased by a local strengthening of the loadbearing structures,
- durability of a terracotta product, whose beauty will endure over time,
- reduced maintenance, since no attention is needed and the simplicity of how a piece is replaced in the event of breakage,
- almost unlimited thermal performance by increasing the thickness of the insulation, suitability for use in both new-build and renovation.
These systems require ventilation from the rear, provided by a 20 mm minimum air gap which runs the full height of the wall behind the cladding products; it serves to break capillarity and to provide drainage or the evaporation of residual humidity; and finally, it is a “thermal softener”, slowing down the major variations in external temperature benefiting from the inertia of the terracotta.
It therefore provides the structure and the external insulation with optimum durability.
The whole of the ventilated wall, finishing accessories included, must follow the general recommendations, some of them relating specifically to cases where ventilated walls are provided with external insulation:
- compliance with the requirement for the continuity of the air gap from bottom to top, with ventilation in the upper and lower parts of the building to be sized according to the rules published in the CSTB specifications.
- protection in the upper part by water run-off devices with overhangs to combat running water: only minor penetration of water through the cladding itself is tolerated, failing which damp will persist behind the cladding; water run-off overhang devices will avoid a concentration of stains on the wall.
- optimum waterproofing around opening along trim, in particular where it is fitted bare internally. In these cases also, it is preferable to anticipate the need to compensate for alignment faults
between the wall and the joinery, by the use of suitable devices in the steel trims.
The care taken in the protection of the edges of bays against water must be accompanied, where insulation is fitted, with a protection under the trim against thermal bridges, using continuous insulation under those surfaces that are subject to outside temperatures.