Why Inspect Your Roof?

CONCRETE ROOF  TILE INSPECTION

During an inspection of concrete tile, you should look for the following  types of problems:

  • installation, including:
    • fastening;
    • proper exposure; and
    • flashing.
  • broken, damaged and missing tiles;
  • environmental problems, such as biological growth;
  • manufacturing problems, such as spalling, voids and shrinkage cracks; and
  • excessive weight.

 

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.

 

FASTENER FAILURE

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

A concrete tile roof is at or near the end of its useful life when a  significant percentage of the tiles show damage or deterioration.

 

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