B has a contract with C that states:
- B will design a building for C; and
- 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?