body: **B** has a contract with **C** that states:
  
  
  1. **B** will design a building for **C**; and
  2. **C** will indemnify **B** in respect of losses resulting from negligence in design.
  
  
  **B** proceeds to design the building.
  
  
  Roof tiles used, were not compliant with **B**'s design. **B** has warned this to C's client who insisted to use heavier tiles.
  Is it a breach of contract by **C** -not using the tiles as designed by **B** or **B**'s contract with **C** has been discharged by performing the design?
  
  
  
title: Contractual liabilities - breach - discharge of contract