What type of insulation is recommended for steel decks?

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Perlite insulation is often recommended for steel decks due to several beneficial properties that align well with the needs of steel roofing systems. Perlite is a lightweight, fire-resistant material that provides effective thermal insulation while also contributing to sound attenuation. Its non-combustible nature makes it an excellent choice for applications where fire resistance is a priority, such as in commercial or industrial buildings with steel decks.

Additionally, perlite insulation has a relatively low density, making it easier to handle and install compared to heavier insulation materials. It also offers good moisture resistance, which is advantageous in protecting the underlying steel deck from potential corrosion due to water intrusion.

In contrast, other insulation types may not provide the same balance of properties suited for steel decks. For instance, while mineral wool and fiberglass also offer good thermal insulation, they may not be as lightweight or fire-resistant as perlite. Polyurethane foam, while an excellent insulator, can present challenges related to fire performance and potential moisture absorption, making it less ideal for certain applications involving steel decks. Thus, perlite insulation stands out as the most well-rounded choice for steel deck applications.

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