Dictionary

Waterproof or water-resistant describes objects relatively unaffected by water or resisting the ingress of water under specified conditions. Such items may be used in wet environments or under water to specified depths. Waterproofing describes making an object waterproof or water-resistant (such as a camera or watch).

"Water resistant" and "waterproof" often refer to penetration of liquid water. Permeation of water vapor is reported as a water vapor transmission rate. Also, water from condensation is usually separate from "water resistant".

The hulls of boats and ships were once waterproofed by applying tar or pitch. Modern items may be waterproofed by applying water-repellent coatings or by sealing seams with gaskets or O-rings.

In construction, a building or structure is waterproofed with the use of membranes to protect contents underneath or within as well as protecting structural integrity. The waterproofing of the building envelope in construction specifications is under '07 - Thermal and Moisture' protection and includes roofing material as well as waterproofing materials.

Waterproofing is used in reference to building structures (basements, decks, flat roofs, wet areas, etc.)