Designed or treated to resist or prevent the passage of moisture or damp into a building or structure.
Compound word from 'damp' and 'proof' (meaning resistant or protected against), becoming a standard architectural and construction term in the 20th century.
British builders obsess over 'dampproof' everything because of their rainy climate—it's like the entire architectural industry was invented to fight the one enemy: water creeping into walls!
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