Roofing Systems and Components Flashcards

When inspecting a chimney, a home inspector observes that the mortar crown is cracked and missing sections. What is the primary risk?

Answer: Water infiltration into the chimney structure causing accelerated deterioration

A cracked or missing chimney crown allows water to enter the chimney structure, leading to freeze-thaw damage, efflorescence, and accelerated brick and mortar deterioration.

What is the recommended nailing pattern for asphalt shingles to prevent wind uplift?

Answer: 4 nails per shingle placed in the nail zone above the adhesive strip

Standard practice requires 4 nails per shingle placed in the manufacturer's designated nail zone just above the adhesive strip for optimal wind resistance.

A roof inspector finds that counter flashing at a chimney is embedded in the mortar joints but is not sealed. What is the correct assessment?

Answer: Counter flashing embedded in mortar joints is the correct installation method and does not require additional sealant

Counter flashing correctly embedded (tuck-pointed) into chimney mortar joints provides a secure, water-resistant seal without relying on caulk alone.

Which roofing defect is described as a separation of the laminate layers in an architectural (dimensional) shingle?

Answer: Delamination

Delamination in architectural shingles refers to the separation of the top and bottom laminated layers, which compromises the shingle's integrity and weather resistance.

What condition should a home inspector report when observing exposed nail heads on the surface of asphalt shingles?

Answer: A deficiency requiring repair as exposed nails are a potential leak source

Exposed nail heads on shingle surfaces indicate improper nailing above the nail zone and are a reportable deficiency as they create a direct pathway for water infiltration.

An inspector observes a roof with two layers of asphalt shingles and significant wear on the top layer. What is the correct finding?

Answer: The roof has reached the maximum allowable layers in most jurisdictions and requires a full tear-off before re-roofing

Most building codes allow a maximum of two layers of asphalt shingles; adding a third layer typically requires a complete tear-off of existing material first.

What is the primary purpose of ice and water shield underlayment installed at roof eaves?

Answer: To prevent water infiltration caused by ice dams backing up under shingles

Ice and water shield is a self-adhering, waterproof membrane installed at eaves to prevent water from ice dams from wicking back under shingles and into the structure.