How to apply cold-bridge-free anchoring in exterior wall insulation

Unlike in our surrounding countries, the Netherlands completely misses the mark when it comes to anchoring, for example, awnings, air conditioning units and rainwater drains in an exterior wall insulation system with a decorative plaster or stone strip final finish. So says Roel Tromp of LJ Innovate. "To prevent plaster degradation, a cold-bridge-free anchoring is crucial."

Mounting awnings to an exterior wall insulation system, for example, requires attention, according to Roel. "Be aware that regular steel studs cause a thermal bridge in the facade," he says. "In practice, the stud will always sink another 1 or 2 mm and condenses, continuously feeding moisture to the back of the mortar fabric layer. It is a breeding ground for algae and mosses, and causes damage to the stucco. In the case of an awning, there are easily six suspension points where condensation can form, thus affecting the plaster on the back. So, with a bit of bad luck, the plasterer can plaster the entire facade again. A pity about the damage and waste created. Not to mention the extra money involved in the repair. Not to mention the reduction in insulation value. Often the plasterer is held liable for this, while the fault lies in the use of the wrong assembly materials."

LJ Innovate is part of LJ Solutions and supplies special ventilation and fastening products for traditionally plastered facades and exterior wall insulation. "We distinguish two types of fastening products: an anchor with a full polyester threaded end or an anchor incorporating a thermal bridge break," says Roel. "So the solution is axiomatically simple, but it needs attention. And that is often what is lacking. Our goal is to make the market aware of the fact that a lot of suffering can be prevented by thinking about thermal bridge-free installation in exterior wall insulation systems in the preliminary stages. It results in facades that not only retain their functionality, but also remain beautiful much longer."