How long does Impermax last and when is replacement necessary?

Well-applied Impermax lasts for many years, but how long exactly? And how do you know when it’s time for replacement or maintenance? The lifespan of Impermax depends on several factors, such as the substrate, the layer thickness, and the conditions in the roof is exposed to. In this article, you’ll discover how long Impermax typically lasts, what to watch for as it ages, and the signs that indicate a new layer is needed.

What is the lifespan of Impermax roof coating?

Impermax is known for its long lifespan. When applied correctly, the coating can last more than 20 years. Factors such as the substrate, weather exposure, and usage (e.g., foot traffic) play a significant role. Regular inspections help to detect wear early and prevent problems.

Our advice:

Impermax as a single-layer system over existing roof coverings can last 10 years.
In combination with polyester fleece, the total system can last at least 25 years.

Signs that your Impermax roof coating needs replacing

Over time, signs of wear or ageing may appear. Watch out for the following:

Small cracks or splits.
Blistering or lifting edges.
Standing water in certain areas.
Reduced adhesion at edges or details.

If you notice one or more of these symptoms, it’s time for inspection or replacement.

When can partial repair replace a full roof replacement?

For minor damage or localised wear, it is often enough to patch Impermax locally. Clean the surface thoroughly, lightly sand, and apply a new layer, using primer if necessary. This is particularly effective for small cracks, edge damage, or superficial blisters. Full replacement is usually only required in cases of structural damage or poorly adhering layers.

Maintenance tips to extend the lifespan of Impermax

Proper maintenance can significantly prolong its life:

Inspect your roof annually, especially after winter.
Remove dirt, moss, and leaves to ensure proper water drainage.
Check vulnerable areas such as edges, roof penetrations, and upstands.
Repair minor damage immediately to prevent it from spreading.

These simple actions can extend the lifespan of your roof by several years.

Want to know more?

At Polyestershoppen, you’ll find everything you need for a well-maintained roof. For more information about Impermax or roof repair and maintenance, feel free to contact our product specialists or browse the full range of Impermax products.