Glaziers’ putty – composition, use, and handling in building works What is correctly stated about traditional putty used around window glass panes?
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AIt is made from finely powdered chalk (whiting) and linseed oil
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BIt is used for fixing and sealing glass panes in frames
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CIt can be softened by suitable solutions during maintenance
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DAll of the above
Answer
Correct Answer: All of the above
Explanation
Introduction:Putty, especially traditional glaziers’ putty, remains a practical material for bedding and sealing glass panes. Understanding its composition and handling ensures durable, weather-tight glazing in doors, windows, and skylights.
Given Data / Assumptions:
- Composition refers to classic putty, not modern polymer mastics.
- “Softened” means reconditioning for removal or rework, not daily service.
Concept / Approach:
Classic putty is a plastic sealant produced by mixing whiting (finely ground chalk/calcium carbonate) with linseed oil to a doughy consistency. It cures by slow oxidation of the oil, forming a firm yet slightly flexible seal around glass edges.
Step-by-Step Solution:
1) Composition: whiting + boiled/raw linseed oil → malleable compound.2) Use: roll into fillets, press around the rebate to bed glass, tool to a neat arris for weathering.3) Maintenance: aged putty can be softened/loosened using appropriate solvents or alkaline solutions to aid removal; care is required to avoid damaging timber or glass.Verification / Alternative check:
Traditional building practice and conservation handbooks consistently specify chalk + linseed oil recipes, with rework methods using controlled softening or mechanical removal where needed.
Why Other Options Are Wrong:
Each of the first three statements is correct in the traditional context. Therefore, the combined statement “All of the above” is the right choice.
Common Pitfalls:
Confusing modern acrylic/silicone mastics with classic putty; applying paint too soon before oxidation cure; or neglecting proper bevel for water shed, which shortens service life.
Final Answer:
All of the above