Moisture Guard Guards against moisture penetration. The asphalt base in Koppers aluminum roof coatings provides excellent adhesion to the existing surface. The result is a reflective surface that guards the substrate against moisture penetration. Koppers has developed a comprehensive Roof Repair Handbook to enhance your Preventive Roof Maintenance Program. For copies of this manual and other information and services call 1-800-558-2706.  Return to Koppers Aluminum Roof Coatings