Open joints between insulation boards
Every open joint is a thermal bridge and often causes cracks in the render. Wider joints must be closed with insulation strips or joint foam – never with adhesive or mortar.
Facade insulation fitted: execution is still checkable now
Before rendering, joints, dowels and connections are still visible. Irregularities can later promote heat losses, moisture damage or render cracks.
The most common expensive defects in facade insulation
Wrong number or position of dowels
Too few fixings or dowels in the wrong place cause boards to bow. Deviations from the fixing plan weaken the insulation.
No staggered board bond at corners
Continuous joints (cross joints) and joints running out directly at window corners are the classic cause of diagonal cracks.
Missing connections at plinth, windows and roof
These transitions produce the biggest heat losses and the most frequent moisture damage.
What you should document and check now on the facade insulation
Each facade side as a whole
One overview photo per side. Best early in the morning or evening: in flat light, unevenness and open joints stand out clearly.
Joints and dowels in detail
Photograph open joints, sunken dowels and conspicuous spots with a close-up and scale.
All connections and corners
Photograph window reveals, plinth, roof edge and balconies individually. That is where the joints converge – and where most damage occurs.
Report irregularities before rendering starts
Report open joints or loose boards in writing on the same day, with photo and date. After the render is applied, the evidence is gone.
Before the first coat of render
Upload your photos. You will receive a structured evaluation of joints, fixings and connections for visible irregularities.