underlayment
/ˈʌndərˌleɪmənt/
noun
- A layer of material installed beneath a finished floor or roof to provide support, moisture protection, or sound insulation.
- This foam underlayment helps reduce noise between floors in an apartment building.
- The contractor installed a plywood underlayment before laying the hardwood floor.
- A waterproof underlayment is essential under tile in a bathroom to prevent leaks.
Synonyms