Three main categories are presented:

• Roofing Materials

• Roof Structure

• Interior Finish

These categories are discussed as they relate to structural deterioration and damage or to water leakage.

The roof constitutes the weather barrier for the attic and the remainder of the house, so it is important that it be durable.  Recurring problems with such established roofing materials as asphalt shingles and wood shingles and shakes reflect the need for improved procedures.  Tile and metal roofs, which are gaining in popularity, require extra care when they are designed, scheduled and installed.

Of course, good roofing structure is critical.  Without a solid structure, sagging, shifting and water leakage are likely.  Proper design and good workmanship provide a good base for the roofing materials, which in turn offer protection to the structural elements of the roof.

Problems with the interior ceiling finish, including sagging, wetting and the formation of mold, are also addressed.  These problems can usually be traced to structural deficiencies or to problems with the roofing materials.  Proper construction scheduling and control of the interior environment of the building during construction are also covered.

This section does not present all aspects of roof construction and some of the problems discussed here are more prevalent in certain parts of North America than in others, influenced either by regional construction techniques or local weather conditions.  However, this chapter provides most of the information you will need to identify the causes of problems so that you may avoid creating imperfections during construction.

Additional information on roofs and roofing

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