Enstegstätad fasad

A rendered facade with no air gap, and a raised moisture risk

An enstegstätad fasad (single-stage sealed facade) has only one waterproofing layer against rain. That means if water does find its way in behind the render, it is now inside the wall itself. There is no draining, ventilated air gap behind the surface layer, so the moisture cannot run off or air out. It can only dry slowly through evaporation, and while it sits there it can lead to moisture and mould damage.

The key thing to know: this damage can show up even in houses that are only a few years old. The construction itself carries the risk, regardless of age. The method was common on rendered houses from the 1990s and 2000s, so that is where you should pay the closest attention.

It can also hit your wallet. With moisture damage, the whole facade sometimes has to be replaced, and the repair can run into six or in the worst case seven-figure sums. This is not minor upkeep but a major cost.

What you should do

If you are looking at a rendered house built in the 1990s or 2000s, find out how the facade is built and ask the seller directly whether it is enstegstätad. If it is, have a besiktningsman (building inspector) with moisture expertise take a closer look before you put in a bid. A moisture reading inside the wall tells you where things stand right now, and the answer affects both what the house is worth and what it could cost you down the line.