interNACHI - Inspecting Tile Roofs

Flat profile tiles have a rise of _____.

1/2-inch or less

Felt underlayment on tile roofs with a pitch between 3:12 and 4:12 should have a minimum _____-inch headlap.

2

Felt underlayment on tile roofs with a pitch of 4:12 or greater should have a minimum _____-inch headlap.

2

Tiles installed on roofs having a slope of less than _____&12 are considered decorative and should have a built-up roof or waterproof membrane installed beneath the tile.

2 and 1/2

The typical minimum headlap for tile is _____ inches.

3

Lightweight concrete tiles weigh from _____ to _____ pounds.

500, 800

Standard concrete tiles weigh from _____ to _____ pounds.

800, 1100

T/F: Clay tiles always depend on proper application of a glaze to prevent moisture absorption.

False

T/F: Concrete tiles should always be installed on battens.

False

T/F: Those inspecting roofs should always walk tile in order to provide an accurate evaluation.

False

_____ tiles have a coverlock and underlock.

Interlocking

How many tiles are in a roofing square?

It varies, depending on the size of the tile.

T/F: Failure in one part of the roof may not extend to other parts of the roof.

True

T/F: Skylight flashing should be consistent with headwall and sidewall flashing.

True

To prevent moisture intrusion behind the sidewall flashing, _____ -flashing should be installed at brick and stone walls.

counter

Shrinkage cracks in clay tile are caused by _____.

differential drying rates between the surface and core during manufacturing

Which of the following fastener materials should not be used to fasten tiles?

electro-galvanized

When inspecting tile adhered with mortar, inspectors should look for _____.

failed bonding

Battens are typically installed _____across a roof.

horizontally

Fiber cement tiles have experienced widespread premature failure due to _____.

incompatible constituent materials

Inspectors should evaluate roof decks by _____.

looking for signs of failure

Which of the following would not cause lower right corner damage?

overdriving fasteners

The method used to raise the butts of tiles in the starter course should allow for _____.

roof drainage

During clay tile firing, the process during which minerals in clay change and bond chemically to form a single, dense, non-porous tile is called _____.

vitrification

An underlock forms a _____.

water drainage channel

Which of the following is not a manufacturing defect?

weathering of glaze