Underlayment

Underlayment may mean:

Underlay, a material placed underneath floor carpet, other flooring materials, or mattress bedding.
Underlayment, a water resistant or waterproof layer used beneath many types of commercially available roofing material
Underlayment in road construction such as nonwoven fabric
Underlay, a material in sewing
Underlay, a technique in some types of surgery such as myringoplasty
Underlay, a material in printing

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