To spite a national trend toward renovation, restoration, and remodeling, construction products producers and their associations are not universally eager to publish recommendations for repairing or extending existing materials. There are two major reasons. First, there are several possible applications of most building materials; and there is an even larger number of different problems that can occur after products are installed in a building. Thus, it is difficult to produce recommendations that cover every eventuality. Second, it is not always in a building construction product producer's best interest to publish data that will help building owners repair their product. Producers, whose income derives from selling new products, do not necessarily applaud when their associations spend their money telling architects and building owners how to avoid buying their products. Finally, in the Building Renovation and Restoration Series we have a reference that recognizes that problems frequently occur with materials used in building projects. In this book and in the other books in this series, xv xvi Series Foreword Simmons goes beyond the promotional hyperbole found in most product literature and explains how to identify common problems. He then offers informed inside recommendations on how to deal with each of the problems. Each chapter covers certain materials, or family of materials, in a way that can be understood by building owners and managers, as well as construction and design professionals.