News Article

The BRE Flood Resilience Report on Technitherm

Cavity Wall Insulation

Technitherm Flood resilience

If you’ve read the product page on our website for Technitherm or some of our blog posts, you will have noticed we often mention how it has been tested by the BRE for Flood Resilience.

Well now we’ve decided to give a bit more information about how we tested it.

Test Procedure

Back in 2012 Isothane commissioned the BRE Scotland to determine Technitherm’s Flood Resilience and the capability to withstand the ingress of in a flood situation.

A Rig was set up (see image below) with four tanks. The tanks tested different brick types and different cavity widths Either blue engineering or red clay brick were both used with cavity widths of 25mm and 50mm.


Each of the four tanks were then filled with water to see how much water would leak through the cavity out of the tank. Once this had been completed the cavities were then filled with Technitherm and the test repeated.

Samples of Technitherm were also partly immersed or full submerged in water to test water absorption.

The Findings

The Findings were as follows:

‘The Technitherm polyurethane foam cavity wall insulation appears to offer a watertight barrier in cavity walls. This would prevent the ingress of water to a building in a flood situation but only as a component of a resilience system.’

Basically yes, Technitherm will stop water ingress through the cavity in a flood and keep your inner walls dry reducing drying out time of a property. However to stop any water entering your property a full resilience system is needed. For example, putting Technitherm in your cavities isn’t going to stop flood water entering a property through the drains and under doors, other measures will be needed to prevent this.

‘The samples taken from the cavity walls show that some water was absorbed by the Technitherm insulation, but the material did not show any signs of  degradation as a result.’

This proves that Technitherm will remain serviceable once the flood water has cleared as the Technitherm didn’t show any signs of degradation.

‘The results how that there was no noticeable difference in the performance of the two cavity sizes.’

Showing that Technitherm is equally effective at smaller widths than standard cavities.

Although the insulation was seen to bond better to the medium absorption red clay bricks, this was not seen to have any effect on water tightness performance.

Meaning Technitherm can be used in different types of cavity construction and be just as effective.

More information

If you would like more information on how Technitherm can help then please contact our technical team who will be happy to provide you more information on the product and its suitability.




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