Kernrechtsfrage
Whether the cantonal court arbitrarily assessed the evidence on timely notice of defects under the applicable SIA 118 rules.
Extrahierter Entscheid
No arbitrary assessment was shown; the letter of 20 May 2006 did not clearly establish detailed and timely notice of all defects.
Extrahierte Begründung
The appellants offered only their own interpretation of the letter. The court could reasonably read the letter as a general reference to earlier crack observations, not as proof that all defects had been notified precisely and exhaustively within the contractual period.