Translation guide
The process or state of making something resistant to water. In Japanese, this is expressed through nouns, verbs, and compound terms depending on whether you are talking about treating a material, describing a product feature, or referring to the waterproof quality itself.
Referring to the action of applying a treatment or process to make an object or material resistant to water.
The most common and general term for waterproofing as a process or treatment. Literally 'waterproof processing'. Used for fabrics, electronics, construction, etc.
このジャケットは防水加工が施されています。
This jacket has been treated with waterproofing.
Similar to 防水加工, but often used in more technical or industrial contexts. 'Waterproof treatment'.
コンクリートに防水処理を施す。
Apply waterproofing treatment to the concrete.
Specifically refers to waterproofing work in construction, such as for roofs, basements, or bathrooms. 'Waterproofing construction/works'.
屋上の防水工事を行います。
We will carry out waterproofing work on the rooftop.
Describing the state of being waterproof, often as a feature of a product.
The basic noun meaning 'waterproof' or 'waterproofing'. Often used in compound words or as a label on products.
この時計は防水です。
This watch is waterproof.
Specifically refers to 'waterproofness' or 'water resistance' as a property. Often used in technical specifications.
この素材は高い防水性を持っています。
This material has high waterproofing properties.
Referring to the substance or layer applied to make something waterproof.
General term for waterproofing material or agent. Used in construction and DIY contexts.
防水材を塗る。
Apply waterproofing material.
Often refers to a chemical waterproofing agent, such as for fabrics or leather. 'Waterproofing agent'.
布地用の防水剤をスプレーする。
Spray waterproofing agent for fabric.
防水 (bōsui) means completely waterproof, while 耐水 (taisui) means water-resistant. For everyday items like watches or phones, 防水 is the standard term, but technical specifications may distinguish between the two. 耐水 is less common in consumer products.
防水 can be attached to many nouns to indicate waterproof versions: 防水カメラ (waterproof camera), 防水バッグ (waterproof bag), 防水スプレー (waterproof spray). This is a productive pattern.
Waterproof sheet or membrane, used in construction or as a protective cover.
防水シートを敷く。
Lay down a waterproofing sheet.