It’s a common misconception that once your attic has been lined with fibreglass insulation panels, that they can be trusted to do their job.
Under ‘optimum conditions’ traditional insulation panels should last up to 100 years. In reality, not quite; or even, not close. So how long does insulation last for, and why doesn’t it last longer?
Why Traditional Materials Fail
Fibreglass insulation panels are the traditional, standard insulation for most houses. They’re made up of a kind of glass wool in large square panels that looks like stiff cotton wool but is scratchy and rough to the touch.
They’re commonly laid across the floor of attics and lofts, in thicknesses of about 10 inches, and consequently, take up a great deal of space.
This is not the ‘optimum conditions’ required for insulation with a 100-year lifespan.
Rather, it can start to deteriorate as soon as it comes into contact with the floor and the air. Your 100-year lifespan can very quickly become less than 10.