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...