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Insulation performance is one of the most important features of a garden room and critical to ensuring comfortable use of your new space, 365 days a year.

Polyurethane Insulation & SIPs

There are many “insulated” garden rooms available on the market, but it is the type of insulation and the thickness of the insulation used that matters.  As we offer class leading levels of thermal insulation, we can comfortably disclose and discuss our insulation specifications. Knowing this will provide you with the confidence needed that you new garden room will be usable 365 days a year.

All of our garden rooms feature modern residential specification materials such as structural insulated panels, known for their strength and thermal performance and polyurethane insulation, which per mm of thickness used is one of the most effective insulation materials available.

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Most materials used in garden room construction provide some level of insulation and contribute to the thermal performance of the internal space, from the external cladding thickness to the internal plasterboard.  However, these are all minimum contributors to the thermal performance when compared the insulation layer.

Insulation can be made from many different materials, each offering different levels of thermal performance.  Common insulation materials used in garden room construction are mineral wool, polystyrene, and polyurethane.

The industry standard to compare insulation performance is to look at the material U – Value for a given thickness of material, the lower the value, the better the material insulates.  As standard we use 100mm of Polyurethane as the insulation layer within the typical 192mm total wall thickness, you can see how it compares to the other options below:

  • 100mm Polyurethane U value = 0.020 W/mK

  • 100mm Polystyrene U value = 0.032 W/mK

  • 100mm Mineral Wool U value = 0.038 W/mK

As a summary, you would need a 150mm thickness of polystyrene insulation and a 180mm thickness of mineral wool to achieve the same performance as our standard 100mm Polyurethane offering.

Not all insulation is the same.  We use the best available to ensure a warm and comfortable environment in the winter, with low ongoing energy costs and a cool enjoyable environment in the summer.  Our structures are among the most thermally advanced available when compared to the competition.


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Case Study 1 - Real World Insulation Performance

Read about our real world insulation study on one of our client's garden rooms. Understand how your new space will perform in the real world.


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Structural Design Checklist

Using best practice design standards and calculations, we ensure your new garden room stands the test of time.