Fire Resistance and Safety Ratings of Blanket Insulation Materials

Fire safety is one of the most important considerations in any building project, and insulation plays a bigger role in it than many people realize. Beyond improving energy efficiency, blanket insulation can also help slow the spread of fire and support overall building safety.

At Custom Insulation Company, Inc., we emphasize insulation solutions that balance performance, comfort, and safety.

Blanket insulation is commonly made from fiberglass or mineral wool, both known for their strong fire-resistant properties. Fiberglass does not burn because it is made from inorganic materials like sand and glass, while mineral wool can withstand extremely high temperatures and is often used in fire-rated wall and ceiling assemblies. These materials are designed to resist ignition and help slow the movement of flames within a structure.

Fire safety ratings such as ASTM E84 and fire-resistance hour ratings are used to measure how well insulation performs under fire conditions. These standards help ensure materials meet building code requirements and provide reliable protection when it matters most.

When properly installed, blanket insulation not only improves thermal efficiency but also adds an extra layer of passive fire protection. However, performance depends heavily on correct installation—gaps or compression can reduce both safety and effectiveness.

Choosing high-quality materials and professional installation from Custom Insulation Company, Inc. helps ensure your insulation system performs as intended, supporting both energy savings and fire safety in the long term. Contact Custom Insulation Company for your home insulation needs today!