A guide to external wall insulation

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  • Exterior wall insulation is one of three possible methods of insulating the walls of your home, other options are cavity wall insulation and interior insulation. The right solution for you is determined by looking at your property – an approved, experienced installer can inspect your home and decide what’s best.

    Adding Exterior Insulation (EWI) to your home is an effective way to reduce the energy required to heat your home, save on energy bills, and reduce your carbon footprint. friend.

    “The best way to make your home more energy efficient is to improve the structure of the house, like the walls. “Insulate as much as possible to get the most out of the structure. “

    External wall insulation is one of the improvements in thermal efficiency of brick houses. Most homes in the UK built before 1920 have solid walls, and EWI is a good option if the estate has no design constraints, such as protected buildings or conditions.

    According to a government study, as of the end of December 2020, 91% of solid-wall homes were still uninsulated*. So, if you have, here’s what you need to know to take advantage of the potential energy and money savings that exterior wall insulation offers.

    What are the benefits of insulating exterior walls?

    Uninsulated walls allow about one-third of the heat pumped into the home to escape (according to the Energy Saving Trust**). Improve the efficiency of central heating to maintain a comfortable temperature. Insulating exterior walls and compartments helps keep heating costs down because your oven doesn’t require a lot of energy to maintain a comfortable environment.
    Improved insulation efficiency means you not only reduce your heating bills, but also use less fossil fuels. Therefore, insulating exterior walls can help increase the durability of your home. If you then install renewable technology to run your central heating system, you will benefit from a greener property.

    EWI installation won’t interfere with the work inside your property like internal insulation, so you can easily live at home while you work. It also improves weather resistance and sound insulation.

    Insulating your exterior walls is a great opportunity to update the look of your home. You can make it look a lot like it used to be, or do some upgrades to add to the look and maybe even increase the value of your home.

    What types of exterior wall insulation are there?

    Some exterior insulation products are vapor barriers, which means they do not absorb water and do not pass steam easily. Other types of EWI are evaporative or breathable, so the material can quickly absorb and release moisture, allowing water vapor to pass through the walls and maintain a dry structure.

    Opening is not the same as leaking, so you don’t have to compromise on heat and energy efficiency. The old reinforced walled house was built using steam power and continuing this concept will help maintain the moisture balance of the property.

    In individual projects, wood fibers are an excellent breathable alternative to thermally insulating facades. “Make sure you also use a breathable finish, such as lime-based plaster,” says Will Kirkman, CEO of Ecomerchant.. Mineral wool insulation is also breathable and non-flammable, but it behaves slightly differently than wood fiber and is not affected by direct weathering.

    Airtight (synthetic) exterior wall insulation options are often referred to as rigid board insulation. These include PIR, PUR and EPS products. “A potential problem with composites in older homes is that installation needs to be more precise and durable, so make sure you have a good installer and warranty person. Structural damage to a home can require very expensive repairs,” says Will Kirkman.

    While the composite insulation of the exterior walls can extend to the ground, the wood grain requires a moisture barrier (DPC) of the base plate for maximum coverage.

    Who provides insulation for exterior walls?

    Exterior wall insulation is usually delivered on a delivery and installation basis. You should never try to do it yourself. Installing it without a thorough prior evaluation by an ineffective seller can have serious consequences.

    Find installers who are registered with the appropriate association (e.g. Insulation Insurance Board). You need a professional with a 25 year warranty, such as a professional from Solid Wall Insulation Guarantee Agency (SWIGA). These associations provide a list of approved regional installers on their websites, so this is a good place to start your search.
    Before starting work, an investigation should be conducted to assess which insulation works best and whether any other changes, such as additional ventilation, are required. .

    Matthew Evans of Kingspan Insulation said: “We recommend that your home should be assessed against the PAS 2035:2019 Retrofit Framework before installing exterior wall insulation. Create a clear process to assess existing properties, identify problems and develop clear Improvement plans to increase the energy efficiency of your home. All TrustMark registered installers are required to follow this process in everything they do.

    External wall insulation installation skills

    1. Figure out your wall type

    While exterior wall insulation can match many properties, it is most often used in homes with solid brick walls. It can be difficult to tell the difference between makeup on the walls of your home, but there are a few tricks you should keep in mind. Alternating brick patterns with narrow and long ends are usually solid walls. The width of the brick walls and the age of the house can also tell.

    2. Find the installer

    Make sure your installers are qualified and can give you real examples of their work. If possible, talk to other owners who have used them to make sure they are happy with the job and aftercare. Request a quote and ask about exterior finishes provided by the installer.

    public inquiry

    Your qualified installer will evaluate your walls to find the best insulation. They can identify many structural issues that need to be addressed before installing insulation. They also talked about the small tasks that need to be sorted out before starting work on site, such as removing gondolas, adjusting satellite dishes, etc.

    4. Install external wall insulation

    Because the insulation is used outside your home, you don’t have to move during work. Scaffolding will be erected and some noise may be heard as the walls are prepared and repaired with insulation. But distractions must be kept to a minimum.

    5. Application or coating of rapeseed

    The insulation of the exterior walls is done with plaster or a cladding system such as brick strips to maintain the shape of the masonry. EWI installation, including insulation and finishing, typically takes three to six weeks.

    What are the requirements for exterior wall maintenance?

    Exterior insulation is an invisible part of the home that cannot be seen once it is in place. While it’s mostly a one-to-one and forgettable solution, there are a few things you can do to ensure EWI doesn’t lose its effectiveness.

    Good overall care is important. Make sure that any issues you find, such as cracked plaster, broken gaskets around windows, or leaking gutters, are resolved quickly. This protects the insulation from water and keeps it functional.

    Please check warranty information as changes to new insulated exterior walls, such as plaster painting, hanging basket installation, etc., may require careful consideration.

    * UK Household Energy Performance Data (gov.uk, 18 March 2021)

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    Source : idealhome.co.uk

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