Mechanical Fixings

Mechanical fixings are an essential component of external wall insulation systems. At EWI Store, we offer a wide variety of fixings in different lengths to accommodate the thickness of your chosen insulation material. These insulation board fixings are either screwed or hammered through the insulation and into the wall behind to create a completely secure system. Used in conjunction with the EWI Pro adhesives, the insulation fixings help to ensure that the system will remain stable for years to come.

Our standard classic EWI system is the EPS insulation system. Because EPS is such a lightweight material, it only requires the use of plastic mechanical fixings. The plastic fixings are recommended for this system because they are the best for preventing thermal bridging. This is because plastic is not a thermal conductor, so heat won’t be able to pass through the fixing to escape from the building. Nevertheless, we always recommend applying thermal dowel caps to seal the fixing screw into the system, create a smooth surface and help prevent heat loss.

Because Mineral Wool is a heavier insulation material, it requires metal insulation fixings which are a lot stronger than plastic, which come with a plastic outer casing to help prevent thermal bridging. Again, this type of fixing is designed to go straight through the insulation board and into the substrate behind to ensure the boards are secure.

Our metal fixings can either be screwed in or hammered in depending on the type of insulation and the type of substrate. For example, with the Kingspan K5 insulation system we recommend using metal screw fixings because this is a more rigid material which makes it harder to hammer the fixings in. If you’re unsure about the best type of fixing screw for your project, give our technical team a call for advice.

For high-rise buildings with mineral wool fire-breaks, we recommend the use of metal lamella firebreak fixings. These insulation board fixings are made of stainless steel and are designed to be used with firebreaks as they will not succumb to high temperatures. It’s important to use these fixings for high-rise buildings, as in the event of a fire they will not melt and cause the insulation boards to drop off from the external walls at a great height.


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