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Spray Foam Insulation

How Does Foam Insulation Work? The Full Story


If you’re wondering how does foam insulation work, then you’ve come to the right place- we’re experts in the sector.  We’ve set out to answer these questions for you, so we’re going to cover all the ins and outs that you need to know; you’ll be an expert in no time at all!

If someone asks you ‘how does foam insulation work?’ in the future, you’ll be able to answer them like a seasoned pro.

When you build a home, no matter how hard you try, you’ll find it difficult to maintain complete air tightness as there will be gaps in construction materials and joints.

So, when asking yourself how does foam insulation work, the quickest way to answer this is that it expands to fill all available spaces to create an air seal, so that a reduction in unwanted air transfer occurs. You’ll experience less heat loss and air transfer through cracks, seams and joints.

How Does It Work?

Spray foam is typically applied within the cavities of your home. It forms a continuous barrier on the surface it is applied to. The foam is typically stored as two separate chemicals, and is mixed onsite as it’s applied.

As they are mixed, the foam instantly hardens and expands. It is because of its ability to expand into all nooks and crannies that it gains it ability to insulate your home; because air-leaks are a primary reason for high energy bills and heat loss in a home – you’ll also find that it is able to maintain a barrier against moisture and water, and thus deters mould.

Heat will always flow from where it is hot, to where it is cool. It does this until there is no longer any difference in temperature.

To keep from losing this heat through your building, resistance is applied in various ways, which aims to reduce the loss, by making it more difficult for heat to flow towards the cold.

For your home, this means that heat will flow from the inside of your home to any insulated areas such as garages, attics and the outdoors. 

Foam insulation aims to block this transference of airflow, through its ability to form an air-tight seal in your home; something that other forms of insulation are unable to do – they merely cover small homes, but do not seal them.

When measuring this transfer of heat, a scientific measure has been created called the U-value; the lower this figure, the better the ability to retain heat in your home.


Whichever form of spray foam you decide to use, finding a suitably qualified and experienced installer to work with will make all the difference in ensuring your home stays warm in Winter, and cool in Summer

Spray Foam: Sorting Fact From Fiction

When asking yourself how does spray foam insulation work, it is important to understand the risks associated with installing spray foam in your home, including the chemicals which it’s composed of. 

If you’re more of a DIYer, you might want to read a cautionary tale about why DIY Spray Foam isn’t always a safe option for everyone.

Here you’ll find the risks associated with installation, and what happens if the chemical components are not mixed properly during installation.

Whichever form of spray foam you decide to use, finding a suitably qualified and experienced installer to work with will make all the difference in ensuring your home stays warm in Winter, and cool in Summer.

If the chemical mixture isn’t perfect, you can encounter spray foam pulling away from framing, which results in one thing – a substantial amount of heat loss.

Pitfalls to Avoid With Spray Foam Insulation

If you’re looking to avoid the pitfalls that you can succumb to when installing foam insulation, there are a number of issues that you need to look out for.

You’ll want to make sure that the thickness of your spray foam is sufficient for the UK climate; for colder climates it needs to be thicker than if you’re living in a warmer climate.

It also needs to be uniformly applied, otherwise there will be weak spots within the insulation.

You’ll also want to make sure that your installer does not miss any air leakage sites; if they do, you’ll encounter problems with heat loss in Winter, or condensation in Summer. Ask for a leak test, which can be conducted with a fog machine if you’re unsure about the quality of your installation.

Transform your property for the long-term, with the help of LogicFoam. Simply call 0800 1700 636, or click the button below to get started today!

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