Internal Wall Insulation

Nationwide Internal Wall Insulation Installers

At RJ Insulation, we perform internal wall insulation installations with great efficiency. If your home has noticeably uneven temperatures or struggles to retain heat, you can have us inspect the thickness and stability of your internal walls; they may need some added insulation.

Internal Wall

We are committed to providing efficient, environmentally-friendly solutions to our customers’ home insulation problems – improving their overall quality of life in the process. Using SuperFOIL multifoil insulation, our installers will board up your internal walls, providing breathable thermal protection for every area of your home during all weather conditions.

With our head office based in Ipswich, Suffolk, we can come out to almost any locale across the UK. Discuss your building’s age, requirements and other matters with our team during your initial inquiry over the phone, via email or through our contact form.

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How Does Internal Wall Insulation Work?

The goal of internal wall insulation is to improve a property’s overall energy efficiency and thermal performance. We use SuperFOIL insulation on the internal walls of properties built after 1920. Generally speaking, Sheep Wool will be used on properties built before 1920, though this will occur more rarely.

Thanks to its versatility, SuperFOIL can easily be applied to inside walls. Once installed, it acts as an effective radiant barrier able to redirect heat from all angles, keeping the interior of the home at a consistent temperature throughout all seasons. Sheep Wool protects older houses with untreated timbers by absorbing moisture that would cause condensation, all thanks to its hygroscopic qualities.

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Why Get Your Internal Walls Insulated?

Installing internal wall insulation can be a great investment. From reduced drafts to capped energy bills, we’ve compiled a thorough list of the material and financial benefits internal wall insulation can bring!

lifetime guarantee

Our Lifetime Insulation Guarantee

RJ Insulation’s eco-friendly and sustainable products all come with a lifetime guarantee. The lifetime is against the building itself, so as long as your home stands, your SupaSoft, SuperFOIL, or Sheeps Wool loft insulation will be covered by our guarantee. Additionally, we offer a warranty backed by insurance from the IWA for a period of 5 years.

The Internal Wall Insulation Process Made Simple


Initial Inquiry

However you decide to contact us – be it through our fillable contact form, our email address, or simply calling us directly – you will be put through to the lovely RJ Insulation team. You can discuss important matters like the age and state of your property, which walls you want to have insulated, and anything else of relevance.


Arriving on Time

We are committed to arriving at your home at the agreed-upon time. Previous customers have been pleasantly surprised by our professional dedication to timeliness and ability to travel cross-country in all weather conditions.


"Mr. RJ, Tear Down These Walls!"

Without any further ado, we’ll tear off any wallpaper or panelling on the targeted walls in order to make way for the new insulation structures. Rest assured that our installation team are extremely careful when dismantling your internal walls, always making sure not to damage the integrity of the overall structure or anything surrounding them.


Erecting Support Battens

Before laying down the insulation material, we will place supporting wooden battens to keep the insulation in place. On top of providing more stability, these battens can also improve the evenness of the walls they are applied to.


Placing Insulation Material

At last, we can begin fitting the SuperFOIL rolls between the internal wall and support battens. Acting as an effective, breathable radiant barrier to absorb and reflect heat back indoors, the multifoil sheets will spread across the whole wall, leaving no gaps exposed.


Fitting Plasterboards

Lastly, we cover up the bare insulation with solid plasterboard to create a seamless finish that blends in with the rest of the decor. With your new internal wall insulation installed, you can safely treat the new structure like any other wall in the house.

Certified Wall Insulation Installers

You may be wondering if our service is truly trustworthy. To assuage any concerns, several

    • organisations have glowingly approved our service. RJ Insulation is a Which? Trusted Trader and Trading Standards Approved.

We were awarded a coveted PAS 2030:2019 accreditation for the installation of internal wall insulation. Our team can also conform to PAS 2035:2019 regulations when we are required to do so. In short, you can trust us to handle your wall boarding safely and professionally. Our friendly team always encourage you to make the most informed decisions about your purchases.

Full list of organisations that we are members of, or have been approved by:

  • Which?
  • PAS
  • Trading Standards 
  • British Assessment Bureau
  • Qualitymark Protection
  • IWA Deposit and Guarantee Protection
  • ECMK
  • Elmhurst Energy
  • AECB
  • The Retrofit Academy

Customer Testimonials

Both our previous customers and the accreditors at Which? have given us glowing feedback! We are very grateful to have been given so many well-earned 5-star reviews.

Contact RJ Insulation

Ready to book a consultation or start your insulation project? Fill in the contact form and a member of our team will get back to you straight away.

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    Internal Wall Insulation Installation FAQs

    To get the ideal R-value – the measurement for the amount of heat diffused across a solid surface – it is recommended that insulation on the internal walls should have at least 60mm of thickness, though it can be boosted up to 100mm if necessary. SuperFOIL rolls are thin individually, meaning they can easily fit inside thin internal walls, but for thicker stone walls, they can be stacked up to form a solid yet breathable layer of insulation. 

    Unsure of how much insulation you’ll need? Don’t worry, our team can measure out your internal walls before beginning the installation.

    Some homes may already have internal wall insulation installed, either as part of the initial construction or fitted by previous occupants. If this is the case with your property, chances are it’s working well and you’re feeling the many benefits of it – life’s good. However, inadequately installed wall insulation can be problematic. If you aren’t happy with the quality of your current wall insulation, we can either perform a full clear-out and replace it from scratch, or we can top it up with additional material to boost it up to the recommended thickness.

    Yes, insulating internal walls can be a very worthwhile investment. For a start, the amount of money shaved off of heating bills thanks to reduced energy consumption is enough to convince anyone of the benefits. After installation, it won’t be long before the insulation will have effectively paid for itself. Since SuperFOIL wall insulation lasts for many decades, you will likely recuperate the initial cost of installation several times over by the time it eventually has to be replaced. When factored in with its other highlights, including minimised condensation and property protection, overall, multifoil wall insulation is great value for money!

    The vast majority of homes throughout the UK do not have insulated internal walls, as there is no rule stating that you have to get them insulated. However, there can be many visible benefits to investing in this form of insulation, including reduced energy bills, no more draughts, improved temperature regulation, and much more. In other words, while you don’t have to get your internal walls insulated, it can massively improve your quality of life, and will most often pay for itself in the mid-term.

    Most internal wall insulation should last the lifespan of your house, so it will not need routine replacements. As such, we offer a 60+ year guarantee for our eco-friendly insulation. In the event of lambswool being used for internal wall insulation in a pre-1920 property, rest assured that it also has amazingly high longevity. This is part of the reason why internal wall insulation can be such a worthwhile investment, as a single installation can effectively last a lifetime and the money saved on energy bills will eventually dwarf the amount paid for the initial installation.

    RJ Insulation Installation Services

    Conservatory Insulation Installation

    Conservatories may not be the first place in your home that you would think to insulate, but installing conservatory insulation can be hugely beneficial for reducing your energy bills, improving heat retention, and boosting your overall comfort at all times of the year.

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    Storage Room Insulation Installation

    Nobody wants to risk the long-term safety of their belongings – leaving them in a damp or poorly ventilated location is one way to ensure damage. Ensure their long-term protection with our brilliant storage room insulation service.

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    Loft Insulation Installation

    The loft is one of the most important areas of the house to keep well-insulated for all seasons. At RJ Insulation, we take pride in our commitment to providing sustainable loft insulation – installing it with great care, precision, and to the exact standard specified by PAS2030:2019.

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