Cavity Wall Insulation (17)
The cost depends on the size of your house, however, with subsidies, it will usually cost £100 – £350. However, it can save up to £135 a year, so can pay for itself in 1 – 3 years.
Once a survey has been carried out, and your home deemed suitable for cavity wall insulation, small holes of about 22mm-25mm in diameter are drilled in a pre-determined pattern. Insulation is then blown along a flexible hose into the cavity through these holes.
No. All work is carried out externally through small holes in the brickwork joints. A small amount of dust is created when the holes are drilled. The cavity wall insulation is then blown into place using a hose, straight into the wall, so there is no dust or spills.
The holes used to inject the insulation are filled with matching mortar and are barely noticeable.
The holes drilled to inject the cavity insulation are only about 22mm-25mm in diameter and are filled with mortar after the insulation has been injected. The installer will match the existing render. If the render is painted, the filled holes should be touched up with matching paint when the mortar has dried.
Most homes can be insulated in about two hours, but larger houses may take a whole day.
It’s easy! Just fill in our form here to request a survey and quote, and we’ll get back to you as soon as possible.
No. Extensive tests have shown that Knauf Supafil cavity wall insulation does not allow water to pass across the cavity. Supafil cavity wall insulation also contains a water repellent, and Knauf Supafil is approved by the BBA (British Board of Agrement). Before installing the insulation, the empty wall cavities are inspected for obstructions with a special tool called a boroscope. Any obstructions are noted and cleared by the installers before the insulation is injected.
Installations by approved installers are gauranteed by CIGA
The purpose of the cavity is to prevent rain that soaks into the outside brickwork from crossing to the inside of the wall. The cavity interrupts any water that soaks through the brickwork and drains it to the bottom of the wall where it drains to the outside. Injecting mineral wool insulation into the cavity still allows water to drain to the bottom of the wall. ask the installer about Knauf Supafil cavity wall insulation, which contains a water repellent and so does not absorb water. Extensive tests have shown that Knauf Supafil cavity wall insulation does not cause water to pass across the cavity.
Most cavity walls are indentified by two factors.
- They are about 10 1/2″ to 12′ (270mm – 300mm) thick overall (You can measure this at a door opening).
- All the bricks visible on the outside of the wall are all 9″ (225mm) long (except at corners and openings).
Solid walls have repeat patterns of 4″ (100mm) wide bricks as well as 9″ (225mm) long bricks over the main area of the wall. The walls are usually a little over 9″ (225mm) thick, although in larger properties the walls can be 13 1/2″ (330mm) thick.
No. This is because specialist equipment is needed to install the insulation into the cavity and it’s important that the cavity is fully filled with the correct density of insulation. This is why only trained and approved installers are used so that a guarantee can be given.
My house is semi-detached/terraced and my neighbour(s) doesn’t want cavity wall insulation. Can you still insulate my walls?
Yes, your house can still be insulated. The installer will need to form a hole at the top and bottom of the wall to insert a spacer at the junction between the two houses. This prevents insulation being blown into the cavity of your neighbour’s house.
Sorry, but it’s not possible to inject cavity wall insulation into timber framed houses.
Sorry, but it’s not practical to insulate a single flat in a block. If the property has cavity walls, the whole building should be insulated.
If a house was built within the last ten years, it probably already has cavity wall insulation, which may have been installed as slabs of insulation when the walls were built. You should have received a certificate or some form of documentation when you bought the house if it already has cavity wall insulation, so if you weren’t given one, chances are the walls need insulating. If you don’t have a certificate, though, click here to arrange a cavity wall insulation survey free of charge.
Cavity wall insulation installers can sign up to a professional code of practice, such as those provided by the Cavity Insulation Guarantee Agency, which guarantees the work for 25 years. The installer should carry out post-installation checks on both the inside and the outside of the property, and you will be asked to sign a form to show you are happy with the work. Click here to arrange a free cavity wall insulation survey by a registered installation professional.
Are there grants available for cavity wall insulation and are there strict criteria as to who is eligible, like with loft insulation?
The cost of insulating your cavity walls has never been lower, as it can be subsidised through the CERT (Carbon Emissions Reduction Target) available from large energy suppliers, which brings the cost down to £100 – £350. This means you’ll get a return on investment in around two years’ time. Homeowners can apply for a subsidy from any of the energy suppliers regardless of whether they supply a home’s energy or not! Speak to your energy supplier about what grants and offers are available.
Solid Wall Insulation (3)
I have loft insulation but would like to do more to make my home more energy efficient. I know about cavity wall insulation, but my home has solid walls. Can I insulate these?
Solid walls actually lose even more heat than cavity walls – up to 45 per cent! Solid wall insulation – fitted to either external or internal walls – could reduce the carbon dioxide emissions associated with your home by around 2 tonnes of carbon dioxide a year, making it one of the most impactful changes that can be made to a home. Insulating solid walls can reduce energy bills by around £445 a year, so the investment is well worth making for significant long term savings. It needs to be carried out by a professional installer, so click here to arrange a free survey and help you decide what’s best for your home.
Although there are currently no nationally available energy efficiency grants for solid wall insulation, the Government’s Community Energy Saving Programme (CESP) is aimed at helping families to permanently cut their energy bills by improving energy efficiency standards. It is funded by the energy companies and delivered through community-based partnerships involving Local Authorities via a house-by-house, street-by-street approach, with a particular focus on low income areas to help to take hard-pressed families out of fuel poverty. Check with your local council to see if your property could be tackled under the scheme.
Although not yet launched, it is hoped that funding for solid wall insulation will soon be available via the Green Deal, a new government initiative designed to help meet the upfront cost of making your home more energy efficient. It will allow homeowners to install energy-efficiency measures and pay for the improvements with the savings on their fuel bill. The amount of finance that a Green Deal Provider can attach to a customer’s estimated electricity bill will be limited by the ‘Golden Rule’ principle, which is determined by both the cost of the proposed measures, as well as the estimated energy bill savings that are likely to be realised as a result. It is unlikely that the majority of homes installing solid wall insulation will meet the ‘Golden Rule’ so for packages that include solid wall insulation, the Carbon Saving Obligation, part of the new Energy Company Obligation (ECO), has been designed to help those homes that cannot fully fund energy efficiency improvements through Green Deal finance alone. It is proposed that funding under the Carbon Saving Obligation would be available for all packages which include solid wall insulation.
If you’re a landlord there is also help available for installing solid wall insulation. Until April 2015, the Landlord’s Energy Saving Allowance lets you claim up to £1,500 against tax for energy-saving improvements you have made to each house or flat you rent out.
I’d like to make my period home more energy efficient, but will internal wall insulation ruin my original features, and will I lose floor area?
Internal wall insulation is a fantastic solution for period properties or listed buildings that would require planning permission for any changes made to the outside, or where the owner wants to maintain the authentic exterior appearance of the property. You don’t need to worry about losing your original features or significant amounts of floor space, though. Modern internal wall insulation systems are extremely slim, yet ultra-efficient, and lead to minimal loss of usable floor area.
Installing internal wall insulation does mean that fittings such as plug sockets and skirting boards need to be repositioned, so you’ll need to make sure that any decorative features like cornicing or picture rails are carefully removed and refitted following the installation. You could reduce the annual carbon dioxide emissions associated with your home by around 1.8 tonnes and save £365 per year on your energy bills by insulating solid walls.
Loft Insulation (8)
The cost depends on the size of your house and how much insulation you already have. However, it will usually cost £50-£350 to install yourself which can pay for itself in less than 2 years if you have no insulation already and install insulation to 270mm thick.
To meet current Building Regulations you need 270mm of mineral wool insulation – 100mm between the ceiling joists and 170mm cross-laid (at 90 degrees to the bottom layer) over the joists.
Simply push a tape measure or ruler down the side of a piece of loft insulation until it hits the plasterboard ceiling and read off the depth.
Yes, you will need to clear the loft of any rubbish or stored objects before the insulation is installed. And who knows, you may even find some valuable, hidden treasures too!
You or your installer can also lay two layers of insulation loft boards called Space Board along with an 18mm chipboard deck to provide storage space. click here to view. These insulation boards are made from Polyfoam extruded polystyrene designed to be placed on top of the ceiling joists instead of the 170mm mineral wool insulation. You will need a loft hatch which is minimum 600mm x 600mm. Having 100mm of insulation installed between the joists, two layers of Space Board and a chipboard deck laid on top gives the same thermal performance as installing 270mm of mineral wool insulation.
It takes about 2 hours for an average sized loft.
Allow about half a day once you have bought the insulation. Remember – you will need one layer of 100mm between your roof joists if you don’t have any insulation, then a second layer of 170mm on top (cross layered) to comply with current building regulations. Measure the area of your loft and look at the packaging label for the area contained in a roll.
It’s easy! Just fill in our form here to request a survey and quote, and we’ll get back to you as soon as possible.
Building Regulations (1)
Houses comply with the Building Regulations that apply at the time the property is built. Since the oil crisis in the early 1970s, the insulation standards in the Building Regulations have been progressively upgraded click here to view. The Government recommendation for loft insulation is currently 270mm.
Yes, everyone is entitled to a subsidy and some people can even have free installation. Why? Because the UK Government is obligated to reduce greenhouse gas emissions by 2012 as part of the Kyoto Protocol. One of the easiest ways to achieve a large reduction in greenhouse gas emissions is through increased home energy efficiency. The Government has stated that cavity wall insulation and loft insulation are the most effective methods which is why they have legislated for power/energy utilities and power companies to provide subsidies.
Yes, people living in rented property can get their homes insulated, but you must get the permission of the owner or landlord.
Think Insulation (4)
Thinkinsulation is an initiative jointly supported by the Energy Saving Trust and Knauf Insulation. The aim of thinkinsulation is to increase public awareness of the benefits of insulation and how it contributes to solving global warming and climate change. thinkinsulation can also arrange free no obligation surveys and quotes for subsidised cavity wall and loft insulation via power/energy utility companies, using certified installers and high quality, warranted insulation products.
Well insulated houses use less energy to keep them warm. This means that less carbon dioxide, a greenhouse gas, is released into the atmosphere from burning of fossil fuels (coal, oil and gas) in our power stations and central heating boilers. Global warming is occurring because large volumes of greenhouse gases – including carbon dioxide – are accumulating in the Earth’s atmosphere. This causes the planet’s average air and ocean temperatures to increase and sea levels to rise, resulting in increasingly severe weather conditions. This effect is called climate change and it’s already happening. By improving the insulation of your home, you will be playing your part in reducing the effect of global warming.
Insulation has many benefits:
- Your home will be warmer in the winter, cooler in the summer and more energy efficient.
- You should make savings on your heating bills.
- Your heating system will emit less carbon dioxide, the greenhouse gas that causes Global Warming.
- Glasswool insulation will also reduce outside noise and increase resistance to fire.
- Glasswool insulation is made using recycled glass bottles and is a sustainable product which is light on the earth’s resources. It was awarded an A+ rating in the BRE’s Green Guide. Requiring no maintenance, glasswool will last indefinitely and can even be recycled and reused again if removed from a building.
I make sure my energy comes from ‘Green’ sources, like wind and solar panels – surely I don’t need to insulate my home to help the environment?
Well done for using energy from green sources. Renewable energy sources, like wind power, produce electricity and solar panels are part of the solution if we are to reduce emissions of greenhouse gases and tackle climate change. Although solar panels are good for providing hot water, they do not produce water that is hot enough for central heating. Most homes are heated by gas or oil, and when it’s burnt in your boiler it emits carbon dioxide, a greenhouse gas. By improving the insulation of your home, you will be reducing your energy consumption and therefore playing a greater part in reducing the effect of global warming.