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Breathable External Wall Insulation

Breathable External Wall Insulation spray foam insulation

You’ve likely researched, considered and made an informed purchase decision on insulating your home internally. But when it comes to external walls on properties, information online can be much more difficult to find. If you’re looking to find out the answers to questions like “What kind of insulation should I use for external walls?” and “How does external wall insulation work?”, then you’re in the right place. So without further ado, let’s delve into this topic in detail…



What is Breathable External Wall Insulation?

External wall insulation is unlike internal wall insulation as it is applied directly onto an external surface, and is completely invisible when dry.

There’s no panels to be nailed in, material to be stuffed into cavities, or foam to be dried. External wall insulation is an industrial chemical spray that’s specially designed to bond with bricks and concrete, and protect exterior walls from the elements.

You can’t see it, but the chemical spray sticks to the outside walls and penetrates them slightly – up to about 17mm in.

How Does it Protect My Property?

Once applied, the spray acts to protect the surfaces against water, oil, dirt, algae mildew, and mould. The walls will look considerably cleaner, as any dirt or grot will just run right off them with water.

External wall insulation ensures that rather than acting as a thermal bridge, allowing vapour and cold air to pass through (and then hit your indoor walls and interior insulation), it acts as a thermal barrier, stopping it in its tracks and rendering it impenetrable.

Exterior wall insulation has been proven to reduce water absorption by over 95% compared to non-insulated walls. This of course keeps your home warmer, but also prevents damp from entering your home.

Breathable External Wall Insulation spray foam insulation

How Does External Wall Insulation Weatherproof My Home?

Once insulated, external walls are still able to ‘breathe.’ Breathing masonry improves the thermal conductivity and insulation properties of the walls – which is important, given that just 5% damp content in a wall cavity can reduce insulation’s performance by over 50%!

Before the spray is applied (which must be done by a certified expert technician due to the chemicals involved), walls must be thoroughly power-cleaned and treated for algae and mould, so as not to trap in any nasties.

Once the walls are completely clean and bare, a primer layer will be applied and then the chemical sprayed applied using industrial equipment.

Despite being chemically sprayed, the surfaces are immediately safe to touch. You may notice the walls feel a little different, as the pores of the material are no longer able to collect moisture, but fill with air instead.

It is this that stops the thermal transference of cold into your home. Whilst natural stone and solid brick walls should act to collect air in the material pores all the time, this only applies in practice when the surface is dry – so as soon as it rains, they begin to absorb the cold and damp.

Home Logic are available to discuss your requirements, and to quote and survey your property to see if external wall insulation could be applied, and, if so, talk you through the brilliant benefits it brings!