How Long Do Different Types of Insulation Last?
Choosing the right insulation for your property is a long-term investment. But how long does insulation actually last? The lifespan of insulation varies depending on the material used, the quality of installation, and external factors such as moisture and pests. Below are several types of insulation—some of which you may not have heard of
1. Cavity Wall Insulation
Cavity wall insulation, often made from materials like mineral wool, expanded polystyrene beads, or polyurethane foam, is designed to last for the lifetime of a building—typically 25 to 40 years. However, poor installation or exposure to damp conditions can reduce its effectiveness. Regular inspections can help ensure it remains intact and performing efficiently.
2. Fibreglass Insulation
Fibreglass insulation is one of the most common and affordable options. When properly installed and kept dry, it can last 50 years or more. However, if it becomes wet or compressed, its insulating properties can deteriorate, requiring replacement.
3. Mineral Wool Insulation
Mineral wool, including rock wool and slag wool, is a durable and fire-resistant insulation material. It typically lasts 30 to 50 years, though its longevity depends on the quality of installation and environmental conditions.
4. Spray Foam Insulation
Spray foam insulation, both open-cell and closed-cell, is known for its strong adhesion and airtight sealing properties. With proper installation, it can last 30 to 80 years. However, some mortgage lenders may have concerns about spray foam, especially if it is poorly installed, so it’s important to choose a reputable installer.
5. Cellulose Insulation
Made from recycled paper and treated with fire-retardant chemicals, cellulose insulation has a lifespan of 20 to 30 years. Over time, it can settle and lose some of its insulating effectiveness, requiring top-ups or replacement.
6. Sheep’s Wool Insulation
A sustainable and natural choice, sheep’s wool insulation can last 30 to 60 years. It is naturally moisture-resistant and can help regulate humidity levels, making it a good option for eco-friendly buildings.
How to Extend the Lifespan of Your Insulation
- Regular Inspections: Check for signs of moisture, mould, or pests that could damage insulation.
- Proper Ventilation: Ensuring adequate airflow helps prevent condensation and damp issues.
- Professional Installation: Poorly installed insulation can degrade faster and be less effective.
- Repairs & Upgrades: If insulation becomes damaged, replacing or topping it up can maintain energy efficiency.
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Most insulation materials are designed to last for decades, but their longevity depends on factors such as moisture exposure, installation quality, and maintenance. If you’re unsure about the condition of your insulation, professional assessments can help determine whether repairs or upgrades are needed.
At Cavitech, we specialise in high-quality cavity wall insulation solutions designed to last. Contact us today to discuss the best insulation options for your property.