Other Skilled Trades Glazing 2 — Questions and Answers
Question 1: What is an Insulated Glass Unit (IGU)?
- A single pane with a low-E coating
- Two or more glass panes with a sealed air or gas space between them (Correct answer)
- Tempered glass with wire reinforcement
- A laminated safety glass assembly
Correct answer: Two or more glass panes with a sealed air or gas space between them
An IGU consists of two or more glass panes separated by a sealed air or inert gas space that provides thermal and acoustic insulation.
Question 2: Why is argon gas used in double-pane window units?
- To absorb moisture between the panes
- To improve thermal insulation because it conducts heat less than air (Correct answer)
- To block UV light transmission
- To reduce sound transmission
Correct answer: To improve thermal insulation because it conducts heat less than air
Argon gas fills the space between panes to improve thermal insulation because it conducts heat less efficiently than regular air.
Question 3: What causes a failed seal in an IGU?
- Improper cleaning of the glass surfaces
- Normal aging of the sealant over decades
- Moisture infiltration between the panes (Correct answer)
- Excessive argon gas pressure inside
Correct answer: Moisture infiltration between the panes
A failed IGU seal allows moisture to infiltrate the sealed air space between the panes, causing persistent fogging or condensation that cannot be cleaned.
Question 4: What is Low-E glass?
- Glass designed for low energy consumption in manufacturing
- Glass with a microscopic metallic coating that reflects radiant heat (Correct answer)
- Frosted privacy glass for bathrooms
- Single-pane glass with a thin film applied
Correct answer: Glass with a microscopic metallic coating that reflects radiant heat
Low-E glass has a microscopic metallic coating that reflects infrared heat while allowing visible light to pass through, improving thermal performance.
Question 5: What is the purpose of glazing tape?
- To secure the glass unit during transport
- To provide a compressible seal and cushion between glass and frame (Correct answer)
- To mark measurement layouts on glass
- To hold glass in place while structural adhesive cures
Correct answer: To provide a compressible seal and cushion between glass and frame
Glazing tape provides a compressible seal and cushion between the glass edge and the frame, creating a weathertight barrier and preventing glass-to-metal contact.
Question 6: What is spandrel glass used for in curtain wall systems?
- Structural transparent panels between floors
- Opaque panels concealing floor slabs and structural components (Correct answer)
- Frosted glass for bathroom privacy panels
- Safety glass for stairway railings
Correct answer: Opaque panels concealing floor slabs and structural components
Spandrel glass is opaque and used in curtain wall systems to conceal floor slabs, columns, and mechanical systems between vision glass areas.
Other Skilled Trades Glazing 2
What is an Insulated Glass Unit (IGU)?