Carpenter Red Seal Exam Prep · Question
During a pre-renovation building assessment, you notice a white, powdery substance on a concrete foundation wall in the basement, accompanied by efflorescence. What does this most likely indicate?
Efflorescence is a crystalline deposit of salts that occurs when water moves through concrete or masonry, dissolving soluble salts and depositing them on the su
Start free practice for Carpenter Red Seal Exam Prep
300 questions · no signup required · 40 free questions per day
Question: During a pre-renovation building assessment, you notice a white, powdery substance on a concrete foundation wall in the basement, accompanied by efflorescence. What does this most likely indicate?
Answer options:
- Mould growth due to high humidity.
- Alkali-aggregate reaction in the concrete. ✅ Water infiltration and mineral salt deposits.
- Termite infestation requiring immediate treatment.
Correct answer: Water infiltration and mineral salt deposits.
Explanation: Efflorescence is a crystalline deposit of salts that occurs when water moves through concrete or masonry, dissolving soluble salts and depositing them on the surface as the water evaporates. This indicates a water infiltration issue.
Start free practice for Carpenter Red Seal Exam Prep
300 questions · no signup required · 40 free questions per day
More about Carpenter Red Seal Exam Prep
Related Questions
- When interpreting a foundation plan, a dashed line with 'P. WALL' typically represents which of the following?
- A site plan shows contour lines with an interval of 0.5 m. If two adjacent contour lines are labelled 124.0 m
- According to the National Building Code of Canada (NBC) 2020, what is the primary consideration for the requir
- Two offset stakes are driven at 2.0 m from the proposed edge of a concrete slab. The first stake is marked 'Cu
- What is the primary purpose of string lines and batter boards when laying out a foundation?
- According to typical blueprint conventions, a heavily dashed line (longer dashes) often represents an item tha
More for Carpenter Red Seal Exam Prep candidates
Practice tests
Question explanations
- When interpreting a foundation plan, a dashed line with 'P. WALL' typically represents which of the following?
- A site plan shows contour lines with an interval of 0.5 m. If two adjacent contour lines are labelled 124.0 m
- According to the National Building Code of Canada (NBC) 2020, what is the primary consideration for the requir
- Two offset stakes are driven at 2.0 m from the proposed edge of a concrete slab. The first stake is marked 'Cu
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Carpenter Red Seal Exam Prep Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.