In this residential complex consisting of nine multi-family dwellings, more and more water penetrated the Zinc roofs each year, due to the insufficient inclination of the outer parts of the roofs.
Building inspectors had suggested that in order to remedy the faulty construction, there was no choice but to demolish the roof and rebuild. As about one third of the roofs had been constructed with a gradient far below the required 7%, the result was rainwater backing up in the metal feather edges and thus penetrating the roof.
Remedying the damage while preserving the characteristic appearance of the roof was not a simple task. A compliant refurbishment would have resulted in the unnecessary reconstruction of the roof truss, and would also be subject to approval by the local authorities. Renovating by tearing off the metal and using roofing membranes without changing the gradient would ruin the unique look of the roof.
By using our waterproofing system which is certified for use with existing low gradient roofs, Wittich successfully managed to renovate the roof while preserving the appearance and avoiding costly and complicated demolition and reconstruction.
With our waterproofing system the roofs are now in accordance with the DIN EN 18531 standard and certified for the highest exposure as determined by ETAG, without any demolition and at a fraction of the cost.