The Cavity Wall is generally provided for
- APreventing Dampness
- BHeat Insulation
- CSound Insulation
- DAll of the aboveCorrect
Solution
Concept
Purpose of cavity wall in building construction
Formula
NONE
Step-by-step solution
1. A cavity wall consists of two parallel masonry walls separated by a continuous air space or cavity. 2. The air cavity acts as a barrier against dampness transmission from the outer leaf to the inner leaf. 3. The trapped air layer also acts as an insulator against heat and sound transmission. Answer: D
Explanation
A cavity wall consists of two parallel masonry leaves separated by a continuous air space. This inner air gap acts as a barrier against moisture penetration, thermally insulates the building interior, and reduces sound transmission from outside. Consequently, cavity walls serve all three purposes effectively.
Why the other options are wrong
A) Cavity walls also provide heat and sound insulation, making option D complete. B) Cavity walls also prevent dampness and provide sound insulation. C) Cavity walls also prevent dampness and provide heat insulation.
Shortcut
Cavity wall provides dampness, heat, and sound insulation (All of the above).
Common mistake
Selecting Option A (Preventing Dampness) only, ignoring that cavity walls also provide thermal and acoustic insulation.
Correct answer: D) All of the above