The phrase "act as an insulation" is correct and usable in written English.
It can be used when describing something that serves to protect or separate, often in a physical or metaphorical sense.
Example: "The thick walls of the building act as an insulation against the cold winter winds."
Alternatives: "serve as a barrier" or "function as a shield".
The coat is double-layered, with coarse hair on the outside to shed wind and rain, and the soft fur-like undercoat acts as an insulation and waterproofing.
A mechanically mixed layer containing oxygen and iron was observed on the surface, and this acted as an effective insulation layer preventing metal to metal contact.
This allows cooling air to flow in a thin film over the turbines' surface and act as a form of insulation.
A friend pointed out the key step--placing stuffing into the space between the skin and breast meat--might act as a kind of insulation to keep the white meat cooler in the oven.
During the summer heat is a challenge as diapers act as extra insulation.
These materials will act as insulation (passive efficiency), as a heat source (hot water) and as a source of electricity (active efficiency).
A new diagnostic technique, outlined at a recent conference of the Society for Neuroscience held in Miami Beach, may allow this to be done.The technique, invented by John Gabrieli and Torkel Klingberg of Stanford University, employs a trick known as diffusion tensor magnetic-resonance imaging (DTI) to look at the myelin sheaths that act as the insulation of nerve cells in the brain.
The sedum roof acts as further insulation, as a habitat for creepy crawlies and serves as a living classroom, where pupils can study biodiversity.
When built correctly, a roof garden acts as natural insulation, keeping a building warm in winter and cool in summer.
Insulation placed on the outer side of walls act as an effective protection against the external environment.
