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How Long Does Fiberglass Insulation Last?

How long does fiberglass insulation last

Fiberglass is a word formed by the connection of two other words – fiber and glass. This accurately describes what the material is. This type of fiber is composed primarily of glass and is used in a wide range of applications, most commonly as a property thermal insulator.

You can also find fiberglass in a whole host of other products, such as car parts, roofing products, shower curtains and tent poles. But how long does fiberglass insulation last?

The theory is that fiberglass insulation should last longer than your lifetime. But if your insulated home is starting to show an increase in energy usage, or your bills appear higher than normal, you may have an issue that affects this theory significantly.

The material does wear over time, as do most other materials in this world. Human intervention can also take years off the fiberglass life-cycle. A remove-and-replacement operation may be required to ensure your home remains comfortable and energy efficient.

How Long Does Fiberglass Insulation Last

There isn’t a definite figure or set number of years per-say. But you may be surprised to know that fiberglass insulation can last anywhere between 80 and 100 years. As long as the material is not exposed to too much moisture and is not broken by human interference, it should be fine.

That’s of course an ideal world scenario where you don’t have to combat a wet climate, like in UK.

Still Important to Check

Do not take that as a reason to dismiss checking your fiberglass insulation. The material may have longevity when set in the perfect conditions – but the perfect conditions are very rarely achievable across 80 years or more.

Your property may not have the right conditions for your fiberglass insulation to survive as long as it could. This isn’t to say there is anything particularly wrong with your property, any number of things can occur to affect your insulation’s lifespan including:

  • Water damage from leaks in the roof or burst pipes
  • Mould growth (this can actually form on fibreglass as it allows air leaks)
  • Damage or puncture
  • Human manipulation when storing things in the loft
  • Dirt and debris

If you notice your utility bill is rising, poor insulation could be the cause of this spike. Your old set-up may have lost its effectiveness and needs a replacement. Older properties may simply have inadequate levels of insulation that require topping up. There could be many other reasons as well, totally unrelated to your roof space. The important thing is to check and be totally assured.

We can provide a property audit on your behalf, free of charge! Let us know if we can help by requesting your free survey.


If you notice your utility bill is rising, poor insulation could be the cause of this spike. Your old set-up may have lost its effectiveness and needs a replacement

Spray Foam Insulation from LogicFoam

Here at LogicFoam we are specialists in loft insulation and saving you money on your energy bills. How long does fibreglass insulation last? The final answer is – not long enough as it is prone to mechanical damage. Blown in fibreglass insulation imposes a few other problems which you can learn about here.

We provide innovative and technically advanced insulation called LogicFoam spray foam. This type of insulation is blown into place using air pressure and a series of hoses.

With correct application from an experienced installer, LogicFoam spray foam insulation will last for as long as the building itself.

If you would like some more information on our spray foam installations, just give us a call on 0800 1700 636. One of our expert team members is waiting to take your call.  Arrange a free quotation today and we’ll prove just how long we can keep saving you money! Alternatively, simply click the button below to get the ball rolling today!

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