CCS Chimney Cleaning & Maintenance 3 — Questions and Answers
Question 1: Which chemical product is commonly applied to third-degree glazed creosote to make it more removable by brushing?
- Muriatic acid solution
- Creosote removal spray or powder (e.g., Anti-Creo-Soot) (Correct answer)
- Trisodium phosphate (TSP)
- Lye-based drain cleaner
Correct answer: Creosote removal spray or powder (e.g., Anti-Creo-Soot)
Products like Anti-Creo-Soot (ACS) are applied to glazed creosote deposits to break down and condition them so they can be mechanically removed.
Question 2: What minimum clearance to combustibles does NFPA 211 typically require between a factory-built fireplace chimney and wood framing?
- 0 inches — no clearance needed for listed factory-built systems
- 1 inch
- 2 inches (Correct answer)
- 6 inches
Correct answer: 2 inches
NFPA 211 and manufacturer listings generally require a 2-inch clearance between factory-built chimney components and combustible framing materials.
Question 3: When performing a Level II chimney inspection, which area must be accessed that is NOT required for a Level I inspection?
- Firebox interior
- Accessible attic, crawl space, or basement areas (Correct answer)
- Exterior crown and cap
- Visible portions of the flue from the firebox
Correct answer: Accessible attic, crawl space, or basement areas
A Level II inspection requires accessing all readily accessible areas including attic, crawl space, and basement to evaluate the chimney structure.
Question 4: A homeowner reports white staining on the exterior of their masonry chimney. This is most likely caused by:
- Creosote seeping through the mortar joints
- Efflorescence from water carrying mineral salts through the masonry (Correct answer)
- Residue from chimney cleaning chemicals
- Lime wash applied by a previous owner
Correct answer: Efflorescence from water carrying mineral salts through the masonry
Efflorescence is white salt deposits left on masonry surfaces when water migrates through and evaporates, indicating moisture infiltration.
Question 5: What is the correct purpose of a chimney cap with spark arrestor screen?
- To increase flue draft by narrowing the opening
- To prevent rain entry and stop sparks from landing on the roof or nearby combustibles (Correct answer)
- To reduce the volume of smoke produced by the fireplace
- To filter carbon monoxide from exiting combustion gases
Correct answer: To prevent rain entry and stop sparks from landing on the roof or nearby combustibles
A chimney cap keeps rain and debris out of the flue and the spark arrestor mesh prevents hot embers from escaping and igniting nearby materials.
Question 6: During cleaning, a sweep finds extensive spalling of the clay tile flue liner with large pieces missing. The appropriate recommendation is:
- Apply high-heat mortar to patch the gaps and continue use
- Reline the flue or have a Level III inspection before further use (Correct answer)
- Clean and seal with chimney sealant only
- Install a rain cap to prevent further damage
Correct answer: Reline the flue or have a Level III inspection before further use
Extensive spalling compromises the structural integrity and safety of the liner, requiring relining or a Level III inspection before the appliance is used again.
Question 7: Which CSIA standard describes the three levels of chimney inspection?
- NFPA 54
- NFPA 211 (Correct answer)
- UL 127
- IRC Section R1003
Correct answer: NFPA 211
NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances, defines the three levels of chimney inspection.
CCS Chimney Cleaning & Maintenance 3
Which chemical product is commonly applied to third-degree glazed creosote to make it more removable by brushing?