The handbook is intended to assist professionals working in the field of conservation of architectural heritage, historic structures and materials. Prepared principally for architects and engineers, it may also be relevant for conservator-restorers, archaeologists and others. It is structured as follows: Vol. 1: Introduction, Vol. 2: Porosity, Vol. 3: Salts, Vol. 4: Binders, Vol. 5: Colour specification and measurement