Spray Foam For Concrete Soffits

About Spray Foam For Concrete Soffits

Looking for a seamless, thermal insulation solution that can be installed quickly and efficiently?

Nexseal LE and Sucraseal are the perfect products for creating a monolithic layer of insulation to concrete soffits, especially if M&E is already installed and in the way.


Spray Foam forms an exceptionally strong bond with concrete


Spray Foam can offer British Class 1 & Class 0 fire resistance

Fast Install

Spray Foam is a fast and effective alternative to traditional materials

Where To Use Spray Foam For Concrete Soffits

Depending on thermal requirements and fire regulations, either Nexseal LE closed cell or Sucraseal open cell insulation may be suitable for concrete soffits. From underground car parks and concrete underpasses to external ceiling soffits, spray foam is guaranteed to give you the peace of mind that the insulation will perform for the life of the substrate due to the spray-applied nature of the material.


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How We Help You


Get in touch today to get the ball rolling


Let us specify the requirements for your project​


We’ll provide you with a budget price range


Use one of our ThermoFoam-approved installers


Once installed, we provide a 25-Year Product Warranty


Check out our Gallery where you will find some photographs of installations we’ve completed in the past. Whilst spray foam is insulation and not decoration, our experienced installation teams will always endeavour to provide a neat and tidy finish to the insulation. Nexseal LE closed cell is easier to achieve a neater finish whereas Sucraseal Open Cell expands at a faster rate to leave an undulated finish.


Is the spray foam insulation compliant with fire regulations?

Yes – depending on the requirements there are several options to achieve compliance with fire regulations. Both our Nexseal Closed Cell and Sucraseal Open Cell foams achieve a British Class 1 to BS 476 Part 7, uncoated. If a class 0 spread of flame is required, we can apply an intumescent coating to the foam to improve its fire performance.

Will the spray foam bond to the concrete?

Yes, closed cell spray foam has an incredibly high tensile strength and cohesive bond to the substrate onto which it’s applied. Open cell spray foam can be subject to cohesive failure when applied to metal substrates but it’s generally fine when applied to concrete. We’d always usually recommend closed cell spray foam for large surface areas as there is a guaranteed adhesion, 25-year guarantee and lifelong performance.

Should a vapour control layer be applied?

In high humidity or high moisture environments, a good vapour control layer is usually recommended. Closed cell spray foam which has a cured skin on it should, however, act as a vapour barrier and should prevent any moisture from entering the thermal line. The requirement for a VCL can be assessed when conducting a static or dynamic condensation risk analysis calculation. Some paints can be classed as a vapour control layer.

Why isn’t a ventilation gap required?

Unlike pre-manufactured insulation, spray foam is manufactured in-situ and bonds to the surface as a liquid before expanding to its finished state. The strong cohesive bond of closed cell spray foam makes a seamless extension to the substrate onto which it’s applied. This leaves no potential for moisture to become trapped between an element of the building make-up, therefore, no ventilation air-gap is required.

Is there any need for maintenance of the spray foam?

No. Once applied, spray foam insulation will not diminish, degrade or peel away from the substrate. It’s finished state will remain constant and therefore it requires no ongoing consideration. It is important not to damage the spray foam insulation when conducting any other works within the insulation zone. We recommend you speak to us should you need to make any building alterations once the spray foam has been applied.

Why Is Spray Foam Best For Soffits?

Any form of concrete soffit will benefit from spray foam insulation. No airgaps are needed which is a critical factor when dealing with limited headroom. The speed of installation is far quicker than using traditional, pre-manufactured materials and the strong adhesion to the surface means that no other special fixings are required.

Our Products

Check out our BBA Certified Spray Foams

Our range of open and closed cell spray foams are industry-leading, BBA-Certified, use recycled materials and contain water-based blowing agents.

Nexseal Closed Cell

This low exothermic, high-lift closed cell foam boasts a fast installation time, offers incredible thermal performance and improves the structural integrity of a building. Loved by installers for its fast rise, Nexseal is ozone-friendly and is pending BBA certification which is due in June 2022.

Sucraseal Open Cell

The leading open cell foam now available in the UK. Sucraseal combines peace of mind British Class 1 fire safety with exceptional thermal performance and is pending BBA Certification which is due in June 2022. Sucraseal is installed exclusively by ThermoFoam-approved contractors only.

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