FAQs

Solid Wall Internal Insulation

Solid Wall External Insulation

Cavity Wall Insulation

Loft Insulation

Solid Wall Internal Insulation

How straightforward is it to fit Solid Wall Internal insulation?

Installation can take place room by room to minimize disruption to your home, however, you will notice some noise and dust. Our technical teams are trained in best practice and will ensure they leave your property as clean and tidy as possible.

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How long does it take?

You should allow one full day to install Solid Wall Internal insulation in an average sized room, depending on the level of preparation needed.

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How does it affect the room?

Wall light fittings, radiators, pipework and room features such as skirting boards, doorframes and coving will be removed first. This is so they can be reattached to the insulation panels that will make up the ‘new’ internal wall.

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Is it expensive?

Ask us for a no-obligation survey of your home to find out more. Solid Wall Internal insulation is generally cheaper to install than external wall insulation, although you will also need to consider the cost of re-decorating your room. 

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Can I get a grant for Solid Wall Internal insulation?

Talk to us about getting your insulation through the Government-backed Green Deal scheme. Some householders could qualify for a grant worth up to 100% of the cost for this type of home improvement, as it helps meet the UK’s carbon emissions reduction target.

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How does Solid Wall Internal insulation work?

Our specialised insulation panels are fixed onto the wall and the joints are sealed in, holding the panels firmly in place as one solid sheet. The new ‘wall’ keeps in warmth, where the original wall may have been prone to cold and heat loss.

At your no-obligation survey ask the InstaGroup surveyor about the rate at which heat will pass through the wall once the work is done. This is known as the ‘U-value’, and should normally be no more than 0.30 watts per square-metre kelvin. The lower it is the better.

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Will I notice a big difference?

You will notice straight away that the room feels warmer – and is easier to keep warm. You may also benefit from improved sound insulation. Depending on the thickness of the insulation panels used, you will notice a slightly reduced floor area of the room. 

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Are there any drawbacks?

Solid Wall Internal insulation can make it more difficult to hang heavy items (such as large shelving units) to inside walls. Special fixings are available, so talk to your InstaGroup surveyor if this may be a problem.

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Is it true Solid Wall Internal insulation can cause damp?

Solid Wall Internal insulation requires professional installation. If the panels are fitted incorrectly there is a real risk that warm air from the room will meet the cold solid outer wall and condense inside, trapping moisture and causing problems with damp and mould growth. InstaGroup’s insulation panels feature a unique ‘breathable’ material on the facing layer to prevent moisture from building up, and our installers ensure that all boards are carefully sealed.

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What if the room has damp in the walls?

Any problems with penetrating or rising damp must be treated before insulation can be installed.

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Solid Wall External Insulation

How straightforward is it to fit Solid Wall External insulation?

We work to ensure there is minimal disruption to your home life during installation. Most of the work takes place outside your home, on the exterior walls, so you can carry on your daily life as usual.

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How long does it take?

You should allow around 1-2 weeks for installation, depending on the size of your property. 

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What happens at installation?

Our installers will need to put up scaffolding, so please ensure all the areas around your outside walls are cleared on the day the team arrives to start work. They will also have to remove anything attached to your walls (e.g. outside lights, drainpipes and satellite dishes) before starting the installation of the panels.

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Is it very expensive?

Ask us for a no-obligation survey of your home to find out more. Solid Wall External insulation can save you £260 a year on energy bills, paying towards its cost over time. 

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Can I get a grant for Solid Wall External insulation?

Talk to us about getting your insulation through the Government-backed Green Deal scheme. Some householders could qualify for a grant worth up to 100% of the cost for this type of home improvement, as it helps meet the UK’s carbon emissions reduction target.

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How does it affect my home?

Solid Wall External insulation is beneficial all round. It improves the look of your outer walls and will make your house feel warmer and cosier in the winter and cooler in the summer. It also helps weatherproof your walls and protect the brickwork, as well as saving you a significant amount on heating bills.

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How long does Solid Wall External insulation last?

Our system has a 25 year guarantee, backed by SWIGA (the Solid Wall Insulation Guarantee Agency).

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Will I notice a big difference?

You will notice straight away that rooms feel warmer – and are easier to keep warm. You will also benefit from draught-proofing and improved sound insulation. 

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Is there anything I should know?

You will need to inform your Building Control Officer, who will be able to advise whether or not planning permission is required for installing Solid Wall External insulation.

Also, the installation team will require good, all-round access to the outer walls, so the areas around your property will need to be clear.

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Can any house have this installed?

Solid Wall External insulation is not recommended if the outer walls of a building are structurally unsound and cannot be repaired.

In addition, any problems with penetrating damp must be addressed before insulation can be considered.

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I live in a Park Home – can I improve my energy efficiency with insulation?

Yes – you could save up to 50% on your energy bills. See our Park Homes section for more details.

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Cavity Wall Insulation

What is a ‘cavity wall’?

In most homes built after the 1920s the external walls are constructed of two brick or block walls with a 50mm (or more) cavity between them. This was designed to stop rain and damp from outside seeping through to inside walls. Your InstaGroup surveyor can find out how your home was constructed and offer the best insulation advice at your no obligation survey.

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How straightforward is it to fit Cavity Wall insulation?

It is simple, clean and quick. Our specially trained installation teams work to ensure there is minimal disruption to your home life. Most of the work takes place outside your home, on the exterior walls, so you can carry on your daily life as usual. 

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How long does it take?

You should allow around half a day for an average 3-bedroom house.

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Can I get a grant for Cavity Wall insulation?

Talk to us about getting your insulation through the Government-backed Green Deal scheme. Some householders could qualify for a grant worth up to 100% of the cost for this type of home improvement, as it helps meet the UK’s carbon emissions reduction target.

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What happens at installation?

Our fully-trained installation team works from the outside of the house, drilling a series of small holes in the mortar of the brickwork. The specified insulation material is then blown in through these holes using a blowing machine to fill the wall cavity.

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Do I need to prepare anything, or be at home during installation?

Every part of the wall must be filled with insulation, so it's important outside areas are cleared to ensure the installer can reach all your external walls. You should also take down pictures or remove fragile items positioned against inside walls, on shelves for example. This prevents any breakages from the vibration caused by the installation process.

Before and after installation the technician will need to do a few safety checks inside your property, so they will need access. Everything else is carried out from the outside.

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Is it messy or noisy?

Cavity Wall insulation is a clean and efficient way to save money and energy in your home. You will notice the drilling noise, some vibration and the blowing of the insulation machine for an hour or two, and there is a little dust that the technicians will clear away on completion of the job.

Before finishing up, all the holes in the brickwork are filled with matching mortar, so you'll barely notice they were there.

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Is it very expensive?

Ask us for a no-obligation survey of your home to find out more. Cavity Wall insulation can save you £155 a year on energy bills, and pay for itself in under 4 years. 

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How long does Cavity Wall insulation last?

InstaGroup Cavity Wall products have a 25 year guarantee under CIGA.

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Will I notice a big difference?

Your rooms will feel warmer, and it will be easier to keep the heat in. You’ll notice it stays cooler in summer too. 

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My home is semi-detached – will Cavity Wall insulation affect my neighbour’s property?

If your home's external walls are joined to another house we will plan around this. Our installers use special wall cavity barriers that ensure the insulation material stays in your part of the building, so your neighbour’s home will not be affected.

If you think your neighbour may be interested in warming up their home please tell them about your plans to install Cavity Wall insulation, as we can easily insulate both homes at the same time. 

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Is there any maintenance or servicing after installation?

No. Your Cavity Wall insulation will last for the lifetime of the building. Normal building maintenance and repairs of walls should still be undertaken to ensure your home’s weather resistance.

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How do I find out if my home is suitable?

Ask InstaGroup for a no-obligation survey. Your home will usually be suitable for Cavity Wall insulation if it is more than ten years old, its external walls are unfilled cavity walls, and the masonry or brickwork is in good condition.

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Loft Insulation

How easy is it to get the loft insulated?

If your loft is easy to access it should be easy to insulate.

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How long does it take?

It takes up to 2 hours to install loft insulation in an average three-bedroom house. Larger homes and bungalows may take a little longer as they have a bigger loft space.

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Is it messy?

Our installation team works to minimize disruption to your home. They will need to carry insulation material through your home to the loft hatch. Once installation is complete, they will clear and remove all tools, waste and packaging.

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Do I need to clear my loft?

Yes, you will need to clear the loft of items and stored objects before installation can take place.

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Will I still be able to use my loft for storage?

If you plan to use the loft or attic for storage you will need to lay loft boards over the joists after installation is complete; this would be at an extra cost. You can discuss your storage needs at your no-obligation survey.

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What if my loft is (or could be) converted into a bedroom/living space?

Your surveyor can advise you. We can usually insulate the roof of the loft instead of the floor, using internal insulation boards between the roof rafters.

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There is some foam or fibre insulation already laid in my loft, how can I check if it’s working efficiently?

If your loft is already insulated it's still worth checking that it is working well enough to give you the best savings. A depth of 270mm (around 10 inches) of insulating material is recommended, usually laid as 100mm between the ceiling joists and 170mm over the joists.

It may be possible to ‘top up’ existing insulation to meet the current standards. You can find out more about the efficiency of your current loft insulation at a no-obligation survey.

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Can I get a grant for insulating my loft?

Talk to us about getting your insulation through the Government-backed Green Deal scheme. Some householders could qualify for a grant for this type of home improvement, as it helps meet the UK’s carbon emissions reduction target.

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Is this type of insulation suitable if my home has a flat roof?

A flat roof needs specialist treatment. A no-obligation survey from InstaGroup can help you find out what’s best for your home.

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What if there is damp in my loft?

All damp problems should be dealt with professionally before installing insulation.

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How does loft insulation affect my home?

As you’re saving warmth in the living areas below, the roof space will be colder than before. Pipes and water tanks in the loft may need their own insulation to prevent freezing in cold weather. You may also need to insulate around the frame of the loft hatch to prevent cold draughts.

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