insulate


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in·su·late

(in'sŭ-lāt),
To prevent the passage of electric or radiant energy by the interposition of a nonconducting substance.
[L. insulatus, made like an island]
References in periodicals archive ?
If you insulate them internally, the Energy Saving Trust says that the saving will be about PS445 a year, or PS475 if you insulate them externally (based on the same three-bed, gas-heated semi).
This is how to use self-adhesive foam to insulate your doors:
Will the materials you tested insulate as well when wet?