Improper Surface Grading/Drainage
Water penetration is by far the most frequently found problem.

Roof Damage
Leakage, caused by old or damaged shingles and improper installation.

Heating Systems
Broken or malfunctioning operation of controls, blocked chimneys and unsafe exhaust disposal.

Structurally Related Problems
Structural components such as foundation walls, floor joists, rafters, girder beams, window and door headers.

Plumbing
Existence of old and incompatible piping materials, as well as faulty fixtures and waste lines.

Exteriors
Water and air penetration, inadequate caulking and/or weatherstripping are the most common culprits.

Improper Electrical Wiring
Includes such situations as insufficient electrical service to the house, inadequate overload protection, and amateur, often dangerous wiring connections.

Poor Overall Maintenance
Demonstrated by such signs as cracked, peeling, or soiled surfaces, crumbling masonry, makeshift wiring or plumbing.