underlay

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Related to underlaid: underlain

underlay

felt, rubber, etc., laid beneath a carpet to increase insulation and resilience

Underlay

Material laid directly on the floor to act as a padding; generally for the installation of carpet.

underlay

[¦ən·dər¦lā]
(graphic arts)
The process of equalizing the impression of the press by inserting small pieces of paper beneath the type form.

underlay

1. Same as underlayment.
3. A layer, such as asphaltic felt, which isolates a roof covering from the substructure; underfelt.