Domestic Spray Foam

What is Sprayfoam Insulation?

Spray foam insulation provides rapid efficient insulation with no mechanical fixings. Excellent adhesion to any surface ensures seamless thermal insulation for even complex and irregular structures. Spray foam provides both structural stabilisation as well as draught proofing. Robust and durable Isothane’s range of spray foam insulation offers high performing long lasting solutions.

Our spray foam insulation range, includes our LABC accredited and KIWA approved products; Duratherm® our closed cell system and Isothane WBF our open cell system. Across our spray foam range we can provide the best thermal insulation, draught proofing & building stabilisation in one application. In addition to its thermal properties, spray foam also provides a degree of sound insulation by reducing the transmission of air borne sound.

Our polyurethane spray foam insulation products are suitable for domestic, industrial and commercial properties. They are also suitable for other structures including marine applications. The closed cell structure of some of our foams means that they provide buoyancy and waterproofing where required and are ideal for use in areas prone to flooding or wind driven rain. The application method enables them to be used to insulate irregular shapes and surfaces.

Home Insulation

The Energy Saving Trust estimates that 25% of a home’s heat loss is through the roof, 35% is through the walls and 25% is through air leakage or draughts so cavity wall and loft/roof insulation are two of the most effective energy efficiency measures for the home.

Spray foam can be used in a number of insulation applications including: loft/roof, loft conversion, walls, floors, ceilings and to fill voids and gaps.

The foam helps to reduce heat loss and draughts so reducing your energy bills and making your home feel more comfortable. With a warmer home you should be able to turn the heating down by a degree or two – not only saving energy and money, but this may help to extend the life of your boiler too.

Our spray foam insulation

So why chose Duratherm® when installing spray foam insulation? Duratherm® is our KIWA approved spray foam system which is suitable for insulating a number of different properties and structures. These include; loft conversions, new build insulation, retrofit where it can also offer stabilisation for flat and pitched roofs as well as commercial and industrial buildings. Duratherm®also offers market leading thermal insulation, heat naturally spreads to where the cold air is, so when heating a home the hot air inside naturally tries to escape to the cold air outside. Duratherm® stops his by creating an air tight block which doesn’t allow the hot air to escape keeping the warm air inside the house. As well as its thermal qualities, Duratherm® also offers fantastic stabilisation qualities, which is particularly useful in roofs where nail fatigue or tile slippage may have occurred.

One thing that separates Duratherm® from most other sprayfoam insulations is that its low absorbent, this is because of its closed cell structure which doesn’t allow water to be pass through the foam where as traditional insulation types (bead and wool) and to a lesser extent open cell spray foam will let water pass through into a property. This means Duratherm® can be used in areas prone to wind driven rain or new build properties being built on land prone to flooding.

Want more information?​

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

Installing spray foam insulation

We all know in this day and age the importance of having a properly insulated house, but did you know by installing spray foam insulation you can achieve even better levels of energy efficiency. This means that by installing spray foam insulation into your home you will have the benefits of your home feeling warmer as well as the cost of your energy bills going down.

The versatility of spray foam means it can be applied to almost any surfaces and can offer insulation where other traditional forms of insulation may not be able to. Installing sprayfoam can often be a quicker means of insulation, meaning you can move on with your project quicker. Here at Isothane we offer market leading closed cell spray foam insulation, an example of this would be our Product Duratherm®.

Sprayfoam FAQ

Our approved installers can overhaul your roof and by then applying spray foam to the underside of the slate, this will secure the slates preventing future slippage. Furthermore this will insulate your loft and by preventing the ingress of wind-blown rain, snow and dust, will create a clean and dry useable space at a fraction of the cost of a new roof.

No, the foam can be cut or trimmed to form openings for windows etc. Any resulting gaps may be filled with a proprietary aerosol foam.

Yes, our foam products have a zero ‘Ozone Depletion Potential’ and the insulation properties of spray foam significantly reduce CO2 emissions (and fuel bills) making them beneficial to the environment.

Yes, our spray foam insulation can be applied directly onto roofing felt, breather membranes and tile or slate without the need for a ventilated airgap thus enabling the foam to be installed in accordance with Building Regulations without protruding into the living space as much as board insulation alternatives and by sealing all the gaps has the added advantage of eliminating Air Leakage.

Yes, spray foam insulation can be applied directly to the internal surface of the asbestos cement sheets, where it cures to form a rigid insulation barrier which will also encapsulate and seal the asbestos cement sheets preventing any unwanted fibre release.

No, Duratherm does not absorb water but it does allow water vapour to pass through the foam.

Our systems achieve a Class 1 Surface Spread of Flame when tested to BS 476 Part 7.If Class 0 is required then our Pirthane 0 product achieves this when tested to BS 476 Part 6 and Part 7.

Pitched Roof Insulation

Pitched roof insulation is a topic our technical team receive many queries about. From whole house refurbishments being overseen by architects to homeowners who are looking to improve the thermal performance of their home there are questions concerning achieving the required building regulations and concern around condensation and moisture.

What are the building regulations when undertaking pitched roof insulation?

When looking at refurbishing a pitched roof then an obvious place to look into first is what the building regulations require in terms of insulation. The regulations can be found in Approved Document L1B.

Part L states that where more than 50% of the roof is being renovated the insulation value should be upgraded to achieve a U-value of 0.18 W/m2K.

This can be challenging to achieve when working within the constraints of refurbishing an existing property but the regulations do go onto say that:
where the standard…is not technically, functionally or economically feasible, then the thermal element should be upgraded to the best standard that is technically and functionally feasible…”.

It is important to note though that despite the fact that building control may be happy to accept a lesser u-value you should always be looking to achieve a u-value of no worse than 0.35 W/m2K.

Risk of Condesation

Condensation can be a major concern for architects, homeowners and building experts. As part of the building regulations it is also a requirement to minimise the risks of condensation with regards to pitched roofs. Introducing or improving your insulation within your roof can increase the risks of condensation but there are ways of reducing this risk.

Our spray foam insulation can be applied directly onto the roof covering or breather membrane. Each property should be assessed before any work is carried out to make sure the condensation risks have been considered and reduced.

How we can help

Our product Duratherm® is our closed cell polyurethane spray foam, perfect for pitched roof insulation. It has both KIWA and LABC certification and we have approved contractors across the country who can help you with your project. It has excellent thermal values meaning the depth of insulation required to meet the building regulations for u-values is less than for other types of insulation.

For more information on how our spray foam insulation product can help you to refurbish your roof and increase its insulating properties please contact our technical team.


Read some of our previous customer reviews

"Excellent workforce. Tidy, helpful, courteous, Noticed an immediate benefit on house warming after installation without loss of..."

Carol, Essex

"Workers/Staff helpful and efficient and carried out well but would suggest that protection is used on window sills when bringing..."

David Burder

"Turned up on time, completed within claimed time frame, were polite and friendly and cleaned up thoroughly. Cannot..."

Mr & Mrs Francis-ewen

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