insulating
adj.adj. describing a material that stops heat, sound, or electricity from passing through. You use this to talk about things that keep a house warm or protect you from electric shocks.
adj. referring to a substance or material that prevents or reduces the transmission of heat, sound, or electricity. Often used attributively to describe protective layers or building materials.
The workers are putting insulating foam in the walls.
You should wear insulating gloves when working with live electrical wires to prevent a dangerous shock.
Modern construction relies heavily on high-performance insulating materials to maintain internal temperatures and reduce the overall carbon footprint of the building.
Typically placed before the noun it modifies.