Why are PVC (uPVC) doors and windows commonly preferred in residential and commercial projects? (Assess durability against rust, rot, termites, and water exposure.)
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ARust proof
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BRot proof
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CTermite proof
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DWater proof
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EAll of these
Answer
Correct Answer: All of these
Explanation
Introduction / Context:PVC/uPVC frames have become a mainstream choice for fenestration owing to their durability in humid, coastal, and termite-prone regions. The question examines the range of environmental resistances that justify this preference in practice.
Given Data / Assumptions:
- uPVC is a non-metallic polymer that does not rust.
- It is not a nutrient source for fungi, so it does not rot like timber.
- It is not susceptible to termite attack.
- Properly fabricated uPVC systems have excellent resistance to rainwater penetration.
Concept / Approach:Material selection for doors/windows must consider corrosion, biological attack, and moisture. uPVC offers all-round resistance with low maintenance. Therefore, the most inclusive choice that accurately represents its advantages is 'All of these'.
Step-by-Step Solution:
1) Check corrosion: no iron → rust proof.2) Check biological degradation: polymer matrix → rot proof; not a food source for termites.3) Check water ingress: multi-chamber profiles, gaskets, and proper sealing → water-proof performance in service.4) Conclude the comprehensive benefit set is captured by 'All of these'.Verification / Alternative check:Product literature and standards emphasize durability, low maintenance, and weather resistance of uPVC systems across climates.
Why Other Options Are Wrong:
- Any single property alone understates the multi-factor durability benefit of uPVC.
Common Pitfalls:Confusing water-proof frames with overall window system leakage (usually due to detailing/installation, not frame material); equating rust resistance with total immunity to hardware corrosion (hardware selection still matters).
Final Answer:All of these