Verify commission by architects
[*]Determine and document the delta compared to the execution
[*]If it is clear that the screed layer worked incorrectly, continue with 4., otherwise seek a conversation with the architects (wrong commission?)
[*]Set a very tight deadline for rectification in writing and inform about the consequences of non-compliance.
[*]Simultaneously seek a conversation with the guild
[*]If this deadline is met: OK, if not continue with 5.
[*]Commission (and pay) another company for grinding
[*]No further payment to the first screed layer contractor.
[*]Calculate the additional costs incurred for the first screed layer contractor
[LIST=1]
[*]Grinding by another company
[*]all caused delay costs on the construction site
[*]Offsetting the withheld amount
[*]If no payment, submit a payment order (also possible without a lawyer)
[*]Possibly there will be a discussion about the balancing of interests and a settlement, if not: involve a lawyer.