Prefabricated EPS window frames fail within 6 months because manufacturers use nominal dimensions, not thermal expansion rates. Custom frames cost 30–40% more upfront but eliminate the expansion joint cracking that demolishes most facade renovations by month three.
Most contractors space EPS facade joints by eye. This costs homeowners €800–2,200 in ornament replacement within 36 months. The difference between crack-free moldings and failure is a single millimeter per 60cm of span.
Moisture penetrates behind EPS ornaments through microscopic gaps, causing internal decay that exterior paint cannot reveal. Most contractors ignore the cavity behind moldings where humidity accumulates. Proper drainage and vapor management add 8–12 years to ornament lifespan.
Most contractors treat EPS moldings like drywall—they assume finishing coat equals protection. Field experience shows that moisture penetration destroys EPS from inside while exterior paint remains intact. A proper weather barrier under your finish coat costs €8–15 per linear meter but prevents €2,000+ in replacement ornaments.
The wrong finish coat on your EPS facade ornaments will age them in four years instead of fifteen. Field experience shows most contractors apply finishes that trap water vapor, triggering foam breakdown, color loss, and structural weakness before a decade passes.
Contractors focus on EPS thickness while installation depth—how far the foam sits from the substrate—quietly bleeds 30% more heat than thickness variations. A 5cm gap versus 2cm gap loses the equivalent of a thinner material layer. Field experience shows this is the forgotten variable in facade insulation.
X-shaped cracks radiating from EPS quoin corners after 18 months point to a single root cause: undersized corner angle thickness. Contractors specify 6mm EPS quoins to save €40–€80 per corner, then watch them split under thermal cycling. The fix requires understanding stress distribution, not aesthetic thickness.
The finish profile you select at installation predicts your maintenance budget more accurately than any other material decision. Contractors report that profile geometry directly controls water penetration, coating failure rates, and structural stress distribution across moldings.
Ornament collapse isn’t density failure—it’s depth miscalculation. A 3cm cornice fails where a 5cm survives the same load. Contractors skip this math entirely.
A single density choice determines whether your facade ornaments survive 12 years or fail by year 4. The difference between 15 kg/m³ and 25 kg/m³ EPS costs €300 per 100 linear meters—yet contractors rarely explain the consequence.