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Closed Cell Foam Insulation

Roof Spray Foam Insulation

What is closed cell foam insulation?

Foam insulation is an alternative to more traditional insulation products such as bead and wool. Foam insulation is often chosen for because it offers a greater level of insulation meaning it cuts energy costs and utility bills. Foam insulation also offers great noise reduction qualities as the foam doesn’t allow as much noise to travel through as traditional forms of insulation. There are two types of foam insulation open or closed cell foam insulation. Both offer the qualities listed above however closed cell foam insulation because of its closed cell structure will not absorb and allow water to soak through the cavity effecting the inside of a property. Closed cell foam insulation can be used in both the roof and the cavity wall of a domestic property as well as being used in commercial and industrial buildings such as offices or warehouse.

the benefits of closed cell foam insulation

  • Closed cell foam is very versatile and can be used to insulate a number of different property types.
  • It also offers structural stability in both the cavity wall and the roof of a property.
  • Closed cell structure means it won’t be affected by wind driven rain or flooding.
  • Will prevent the growth of mould or condensation to internal walls where it has been applied.
  • The closed cell structure has buoyancy qualities so certain products can be used on barge, canal boats and even Ocean going yachts.

Our closed cell insulation products


Duratherm® is our spray foam  insulation product.  It is KIWA approved and can be used to upgrade the thermal properties of roofs of many different types of properties to current regulations. Duratherm® can be used for a number of different aspects:

  • Closed cell can be a retrofit insulation where it can offer stabilisation to flat or pitched roofs.
  • Perfect for loft conversions as it will stop any potential water ingress allowing for a dry, warm and clean space to use either a storage or as another room.
  • Can also be installed in new builds to reduce CO2 emissions.
  • Can be used in commercial buildings such as offices as well as warehouses.
  • Can be used on barge, canal or yachts to provide insulation but also preventing condensation which can lead to rusting internally of the hull and other surfaces.

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Technitherm® is our cavity wall closed cell foam insulation product. It is KIWA approved and is the only product to pass both the BRE Flood Resilience Test and to meet their requirements for use in walls with defective or missing damp proof courses. Technitherm® can be used in cavities classed as ‘hard to treat’ as well as a number of different of places, these include:

• Properties that are at risk of flooding such as those built on a floodplain because its low absorbent properties will mean it won’t allow water to pass through the cavity nor will it need replacing after flooding.
Technitherm® can also be used in properties where the wall ties have failed or are missing all together to provide stabilisation.
• Whereas traditional insulation methods need a minimum 50mm cavity, Technitherm® can be installed in cavities smaller then 50mm.
Technitherm® can also be installed in cavities which have varying widths throughout.
• If a property has no damp course Technitherm® can offer protection against damp as well as condensation and mould also
• You can also use Technitherm® in properties which are prone to wind driven rain to stop any ingression of the rain into the property.

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want more information?

Our technical team are on hand to discuss your property or project and how either our cavity wall insulation product, Technitherm®  or our spray foam insulation, Duratherm® can help you achieve the results you want using our approved installer network.



2 Responses to “Closed Cell Foam Insulation”

  1. I have a plastic coated steel clad building with an asbestos fibre/cement corrugated roof let to a removal firm for storage of furniture. We are investigating the use of foam to reduce condensation problems in winter and to seal out driving rain which is an infrequent problem but does increase the humidity in the building during the winter. The building is 18m x 13.5m and 6.5 to the eves. We want to insulate 3 sides and the roof. The internal wall does not need to be insulated and it is 13.5m wide. Please say if your product would be suitable and give me a quotation.

    We are in Hertfordshire near Hemel Hempstead .


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