By Katie Lloyd Thomas

Building Materials is unique in conceiving architectural specification as a starting point for architectural theory, arguing that how materials are prescribed - through a range of practices from the literal processes of procurement and manufacture to epistemological, contractual, social and economic frameworks - radically alters their potential in architecture. Drawing on the work of French philosopher Gilbert Simondon, as well as close readings of everyday specifications from the 18th to 21st centuries, the book reveals that materials do not pre-exist their shaping or use in the world, but come into being through the processes that constitute them. The book addresses three distinct methods of specification each through the lens of a different material – 'naming' through timber, 'process-based' through concrete, and 'performance specification' through glass – in turn revealing how the process of architectural specification (or 'Preliminary Operations' as Simondon puts it) allows for the development of specific relationships between material and function.