CCS Chimney Waterproofing & Sealing 3

Question 1

Which combination of signs inside a firebox most clearly indicates a chronic water intrusion problem?

Accepted Answer

White efflorescence deposits, rust staining, and spalled or deteriorated mortar joints

Answer

Heavy black soot and thick creosote buildup on the fireback

Answer

Light gray ash deposits and minor smoke staining on the lintel

Answer

Hairline cracks in the refractory brick from normal thermal cycling

Question 2

What is the correct function of a properly constructed chimney crown?

Accepted Answer

To shed water away from the flue and protect the masonry below from water entry

Answer

To support and anchor the chimney cap in high winds

Answer

To serve as a decorative architectural cap matching the home's style

Answer

To improve draft by directing airflow into the flue opening

Question 3

What minimum slope is required on a chimney crown to ensure proper water drainage?

Accepted Answer

1/4 inch per foot

Answer

1/2 inch per foot

Answer

1 inch per foot

Answer

2 inches per foot

Question 4

What is the preferred material for constructing a new, durable chimney crown?

Accepted Answer

Polymer-modified cement mortar with a low water-to-cement ratio

Answer

Standard Type S mortar mixed to normal consistency

Answer

Asphalt-based roofing compound troweled to a smooth finish

Answer

Fiberglass-reinforced polymer resin cast in a form

Question 5

Under which condition should a chimney waterproofing product NOT be applied?

Accepted Answer

When the masonry is wet or rain is forecast within 24 hours

Answer

On a warm day with temperatures above 50°F and low humidity

Answer

Immediately after completing masonry repairs on a dry day

Answer

When ambient temperature is between 60°F and 90°F

Question 6

What is the typical effective lifespan of a quality silane-siloxane masonry waterproofing treatment before reapplication is recommended?

Accepted Answer

5 to 10 years

Answer

1 to 2 years

Answer

3 to 4 years

Answer

15 to 20 years

Question 7

What does tuckpointing (repointing) accomplish as part of a chimney waterproofing program?

Accepted Answer

Removes deteriorated mortar to adequate depth and replaces it with fresh mortar, restoring water resistance

Answer

Applies a bead of silicone caulk along all exposed mortar joints

Answer

Fills large cracks with hydraulic cement under wet conditions

Answer

Applies penetrating waterproofer specifically to mortar joints only