1. the process of making something resistant to water penetration
2. material used to make something waterproof

1. present participle of waterproof; making something resistant to water

Examples

• The waterproofing on the basement walls prevented flooding during heavy rains.
• We need to apply waterproofing to the deck before winter.
• The contractor is waterproofing the foundation today.
• Good waterproofing is essential for outdoor gear.
• The waterproofing spray protected my hiking boots.
• They’re waterproofing the roof with a special membrane.
• The old waterproofing had cracked and needed replacement.