Established in October 11, 1914 in Malate, the Union Church of Manila was created to address the spiritual needs of the American population in the country, at the time.

After a series of establishments, the Union Church has found its final settlement in Makati, Manila. The rooftop of the church was consistently leaking, even after repetitive repairs.

CWS100 was chosen by the architect, in order to ensure that waterproofing re-application would never need to be repeated again, as it ensures single-coat, lifetime waterproofing, with no need for future maintenance.