As you know, solid walls are really bad at retaining heat. In the winter, your house can lose up to 35% of its heat through them which is twice as much as cavity walls.

That’s why solid and external wall insulation grants are becoming more and more popular.

However, did you know that solid walls can be insulated by applying high-density insulation boards to the outside or by putting insulation on the inside?

If you’re unsure whether your walls have a cavity in them, look for a pattern of bricks or measure the thickness of the walls next to a door or window to see if they’re hollow:

If the wall is more than 260mm thick, there will almost certainly be a cavity.

Solid and External Wall Insulation Grants

The government’s Energy Company Obligation (ECO scheme) covers a wide variety of insulation measures, including solid and external wall insulation.

The ECO scheme is designed to help vulnerable people reduce their energy bills. If you qualify for the scheme, you could get free or discounted insulation installed in your home.

To receive a Solid Wall Insulation Grant, your home must have solid external brick or stone walls and you must be eligible for any of the following qualifying benefits or meet ECOR Flex rules:

  • Pension Credit – Guarantee Credit
  • Pension Credit – Savings Credit

Pension Credit is available to over a million pensioners, but only a fraction of them claim it.

  • Child Benefit (subject to maximum household income thresholds)
  • Child Tax Credit
  • Housing Benefit
  • Income Support
  • Income-Based Job Seeker’s Allowance (JSA)
  • Income-Related Employment and Support Allowance (ESA)
  • Universal Credit
  • Working Tax Credit

The ECO Flex Rules allow local governments to suggest that a homeowner qualifies for the gas central heating grants for pensioners scheme without having to receive one of the qualifying benefits listed above.

Cavity wall insulation may be installed in most cases on existing walls. However, if your home has solid brick or stone external walls, insulating them might be difficult and more expensive.

External walls can be either insulated on the outside (External Wall Insulation) or within (Internal Wall Insulation).

External and internal wall insulation grants are available for both types of insulation.

EDF Energy, Eon, Npower, British Gas, SSE, and Scottish Power are the main suppliers that offer the ECO scheme.

Related: Are There Government Grants for Air Source Heat Pumps?

Let’s take a look at the different types of solid and external wall insulation:

There are two main types of solid wall insulation: internal and external.

Internal Insulation

This is where you apply an insulating material to the inside of your walls. It’s less disruptive than external insulation as you don’t have to mess with the outside of your house. You can either use spray foam or dry-lining boards.

Spray foam is a quick way to insulate your walls as it can be sprayed directly onto them. It’s also very good at filling in any gaps and cracks that may be letting heat escape.

Dry-lining boards are attached to the wall with special adhesive or screws and then plastered over. They’re more expensive than spray foam, but they’re also more effective.

Related: FREE External Wall Insulation (GRANTS AVAILABLE)

External Insulation

This is where you apply an insulating material to the outside of your walls. It’s more disruptive than internal insulation as you have to remove any existing render or cladding.

You also have to make sure that the insulation is properly sealed so that it doesn’t absorb moisture from the air.

Once the insulation is in place, you can then apply a new layer of render or cladding.

This will not only improve the thermal performance of your home, but it will also make it look more modern.

The main advantage of external solid wall insulation is that it doesn’t reduce the amount of living space in your home as internal insulation does.


Does cladding help with insulation?

Yes, cladding provides an additional protection layer of protection against the elements and can also help to improve the thermal performance of your home.

How do they insulate a single brick wall?

Yes, you can insulate a single brick wall by applying plasterboard to the wall and then filling the gaps with insulation. You can also use spray foam or dry-lining boards.

Do You know any render product specialists?

EWI is a render specialist that sells a wide variety of products that can be used for external wall insulation as well as B&Q and Wickes.

About the Author

Passionate about helping households transition to sustainable energy with helpful information and resources.

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