PARSIPPANY, N.J.—GAF Materials Corp. has entered an agreement to acquire Icopal, a leading European manufacturer of roofing and other waterproofing products, from Investcorp Ltd. for about $1.1 billion. According to a GAF release, Icopal operates 36 production sites with 3,500 employees worldwide. It reported annual revenues of about $1.1 billion with operations and sales concentrated […]