Health hazards of fibreglass roof insulation

Updated February 21, 2017

Fibreglass is a type of synthetic resin that is spun into threads and fibres for use as insulation. Contractors use fibreglass bundles to line the inside of rooftops to help slow down heat transfer. The more slowly heat moves, the more efficient the building is at heating and cooling, which leads to lower utility bills. Although fibreglass is common, it carries certain health risks, especially if it is improperly installed.


Carcinogens are small particles that may cause cancer when they are absorbed by the human body. Fibreglass insulation trails small, floating glass fibres that have carcinogenic properties. These particles may be especially prevalent during roofing insulation, where workers spend more time moving and adjusting the insulation. This is why fibreglass is carefully covered, and installers use protective clothes and masks.


While fibreglass particles loose in the air may or may not cause cancer, irritation is a far more common symptom. Inhalation of the fibres cause irritation and pain in the lungs and stomach, where they come to rest. Eye and skin irritation also is a possibility.


Fibreglass has fire-resistant properties but in some cases, insulation heat-resistant properties contribute to smoke or fire problems. This may occur if the material is accidentally installed over a heat source or light bulb. The insulation can concentrate the heat and make it easier for older heating devices to cause fires.


Fibreglass can absorb moisture and hold it for long periods of time. This makes wet insulation a prime growing area for mould. Mould can quickly infest porous surfaces and spread spores throughout a building. Depending on the type of mould, contact with these spores can result in allergic reactions or pose serious health risks.

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About the Author

Tyler Lacoma has worked as a writer and editor for several years after graduating from George Fox University with a degree in business management and writing/literature. He works on business and technology topics for clients such as Obsessable, EBSCO,, The TAC Group, Anaxos, Dynamic Page Solutions and others, specializing in ecology, marketing and modern trends.