CONCRETE ROOF TILE INSPECTION
During an inspection of concrete tile, you should look for the following types of problems:
- installation, including:
- proper exposure; and
- broken, damaged and missing tiles;
- environmental problems, such as biological growth;
- manufacturing problems, such as spalling, voids and shrinkage cracks; and
- excessive weight.
The weight of concrete tiles may vary from 900 to 2,000 pounds per square, depending on the type and manufacturer. When inspecting homes with concrete tile roofs, look at other homes in the neighborhood. If they look similar to the home you’re inspecting but have lighter roof-covering materials, the roof you’re inspecting may also have originally been a lighter material. If you suspect that this is the case, look for compression cracking in drywall or plaster. You may also want to recommend evaluation by a structural engineer if you suspect that the roof framing may not be adequate to support the increased weight.
MISSING OR LOOSE TILES
Missing tiles are relatively easy to spot. Tiles may be lost due to breakage or fastener failure.
Loose tiles may be misaligned, displaced, or raised at one end. The most common areas of the roof to find missing or loose tiles are along the ridges, hips and rakes.
Tiles may be lost or loose due to poor fastener installation practices, such as:
- too few fasteners;
- fasteners that are too short;
- the wrong type of fasteners;
- poorly installed fasteners; and
- corrosion that accompanies aging.
If you find fastener problems in one area, check a number of representative areas across the roof to determine whether the problem is widespread. You may be able to lift tiles to see fasteners. You can try slightly pushing tiles upward toward the ridge. If they refuse to move, the fasteners are holding. Don’t force them.
It may be impossible to see the fasteners, depending on what system has been used.
END OF USEFUL LIFE