Can You Replace a Concrete Floor with Limecrete in an Old House?

Many older buildings across the UK have had concrete floors installed during past renovation work, often long after the property was originally built. At the time, concrete was widely seen as the modern and durable solution for replacing suspended timber floors, compacted earth floors, or older lime-based constructions.

However, in many traditional and historic buildings, concrete floors can create problems that were never originally present within the structure.

Issues such as damp walls, trapped moisture, cold floors, damaged plaster, and poor breathability are all commonly associated with impermeable concrete slabs being introduced into buildings that were originally designed to regulate moisture naturally.

As awareness of breathable construction has grown, more homeowners, conservation specialists, and builders are now asking whether an old concrete floor can be removed and replaced with a breathable limecrete floor system instead.

In many cases, the answer is yes.

Why Concrete Floors Can Cause Problems in Traditional Buildings

Traditional buildings behave very differently from modern properties. Older homes were typically constructed using breathable materials such as lime mortar, lime plaster, timber, soft brick, and stone.

Rather than preventing moisture from entering the building altogether, these materials allowed moisture to move gradually through the structure and evaporate naturally.

Concrete behaves differently.

Once installed, concrete forms a dense and relatively impermeable slab. In modern buildings this is usually combined with damp proof membranes and cavity wall construction designed specifically to work with sealed floor systems.

Older buildings, however, were never designed around impermeable construction methods.

Traditional buildings also tend to move more naturally over time than modern structures. Unlike rigid concrete slabs, lime-based materials are more flexible and better able to accommodate subtle movement within older buildings. This compatibility is one reason breathable limecrete systems are often preferred in heritage renovation projects where preserving the long-term health of the building fabric is important.

When a concrete floor is introduced into a traditional building, it can interrupt the natural movement of moisture through the floor. Instead of evaporating harmlessly through the ground floor, moisture may become trapped beneath the slab or redirected into surrounding walls.

Over time this can contribute to:

• damp patches on internal walls
• peeling plaster and paint
• salt deposits within masonry
• cold and uncomfortable floors
• deterioration of historic materials
• timber decay in some situations

This is one reason breathable floor systems are increasingly recommended in renovation and conservation projects involving older buildings.

You can read more in our article on Why Concrete Floors Can Cause Damp Problems in Old Houses.

Can Concrete Floors Be Removed?

In most situations, yes.

Concrete floors can usually be broken out and removed as part of a renovation project, although the process will depend on the condition of the building and the depth of the existing slab.

In older properties, care must always be taken to avoid disturbing surrounding foundations or damaging sensitive masonry. Historic buildings often behave differently from modern structures, particularly where shallow foundations or soft materials are involved.

Once the concrete slab has been removed, the sub floor can then be prepared for a breathable limecrete floor system.

Because every property is different, floor replacement projects should always be assessed carefully before work begins.

What Happens When Replacing a Concrete Floor with Limecrete?

Replacing a concrete floor with limecrete usually involves creating a new breathable floor build-up designed to regulate moisture naturally while improving thermal performance.

Once the existing concrete has been removed, the floor area is typically excavated to the required depth before the new floor system is installed.

Modern limecrete floor systems are usually built in layers, with each layer performing a different role within the overall construction.

A typical breathable floor system may include:

• compacted subsoil
• geotextile membrane
• recycled foam glass insulation aggregate
• limecrete screed
• perimeter insulation
• underfloor heating where required

One of the key components within many modern limecrete floors is recycled foam glass insulation. This lightweight aggregate provides insulation, drainage, and load-bearing support while still allowing moisture to move naturally through the structure. Because it is vapour permeable and non-capillary, it works particularly well within breathable floor systems.

Further information about modern insulated limecrete sub floor systems explains more about how breathable floor build-ups are designed to improve both moisture regulation and thermal performance within older buildings.

Unlike a traditional concrete slab, this type of construction allows moisture vapour to pass gradually through the floor and evaporate safely rather than becoming trapped beneath impermeable materials.

Many homeowners also choose to incorporate underfloor heating during the replacement process. Limecrete works particularly well with underfloor heating because its thermal mass allows it to absorb heat gradually and release it steadily over time, helping create a comfortable and consistent indoor environment.

Further detail on heating integration can be found in our underfloor heating guidance.

Another advantage of limecrete floor systems is their compatibility with a wide range of traditional and modern floor finishes. Once properly cured, limecrete can be used beneath stone flooring, tiles, brick pavers, and other breathable finishes commonly found in heritage properties. Care does need to be taken when selecting adhesives and installation methods, particularly within older buildings where breathability remains important throughout the floor structure. Guidance on suitable methods for tiling onto a lime-based floor explains more about maintaining breathability beneath tiled finishes.

Limecrete can also provide an excellent base for natural stone flooring, tiles, brick pavers, and other traditional floor finishes commonly used within period properties. Because the floor system remains breathable, it is important that suitable adhesives, grout spacing, and compatible materials are used throughout the installation to maintain the moisture-regulating performance of the overall construction.

How Limecrete Helps Older Buildings Breathe

The defining characteristic of limecrete is breathability.

Unlike concrete, limecrete is vapour permeable, meaning moisture vapour can move gradually through the floor and evaporate naturally.

This allows the floor system to work with the building rather than against it.

In traditional properties, this breathable behaviour is especially important because surrounding materials such as lime plaster, brick, stone, and timber were originally designed to regulate moisture in the same way.

By allowing moisture to move naturally through the floor structure, limecrete can help reduce the risk of trapped damp and support the long-term health of the building fabric.

Limecrete can be thought of as a modern evolution of the traditional breathable materials originally used in older buildings, and its use in heritage renovation projects has proven highly successful. Many property owners notice that buildings feel noticeably drier and more comfortable after replacing impermeable concrete floors with breathable limecrete systems. This is because limecrete allows moisture within the floor structure to evaporate gradually and continuously into the air, slowly enough for it to be naturally ventilated from the building. By contrast, concrete floors often force moisture to escape elsewhere, typically pushing it towards the edges of the slab and into surrounding walls, where damp problems can then begin to develop.

You can also read our guide comparing Limecrete vs Concrete to understand the differences in more detail.

Benefits of Replacing Concrete Floors with Limecrete

Replacing an impermeable concrete slab with a breathable limecrete floor system can offer several long-term benefits for older buildings.

One of the biggest advantages is improved moisture management. Because limecrete allows moisture vapour to move naturally through the floor, it can help reduce the risk of damp becoming trapped within surrounding walls and structural materials.

Many homeowners also find that limecrete floors feel warmer and more comfortable underfoot, particularly when insulation and underfloor heating are incorporated into the floor build-up.

For heritage buildings, compatibility is another major advantage. Limecrete behaves more similarly to traditional lime-based materials, making it far better suited to older properties than modern cement-based concrete.

Limecrete is often viewed as a modern interpretation of the traditional lime-based floor systems historically used within older buildings. This makes it particularly suitable for restoration projects where maintaining the original character and breathable behaviour of the property is important.

Additional benefits may include:

• improved breathability
• reduced damp risk
• compatibility with historic buildings
• improved thermal performance
• support for sustainable construction methods

Is Limecrete Suitable for Listed Buildings?

Limecrete is widely used in listed buildings and conservation projects because it supports breathable construction principles and works in harmony with traditional materials.

Many conservation specialists recommend avoiding impermeable cement-based materials in historic buildings wherever possible.

Because limecrete behaves more similarly to traditional lime mortars and floors, it is often considered a more appropriate solution for heritage renovation work.

Every listed building project is different, however, and listed building consent may sometimes be required before work begins.

You can also explore examples of breathable floor installations on our Projects page.

When Is Replacing a Concrete Floor Worth Considering?

Replacing a concrete floor with limecrete may be worth considering if:

• your property suffers from recurring damp issues
• internal walls show signs of trapped moisture
• the building is solid wall construction
• the property is listed or historic
• you are carrying out a full renovation
• you want to improve breathability within the building

It can also be beneficial where insulation improvements are required without sealing the building and disrupting its natural moisture balance.

If you are considering replacing a concrete floor and would like advice on whether a limecrete system may be suitable for your property, you can contact our team for further guidance.

Frequently Asked Questions

Can I replace a concrete floor with limecrete?

Yes. In many older buildings, concrete floors can be removed and replaced with breathable limecrete floor systems.

Why would I replace a concrete floor in an old house?

Concrete can trap moisture and disrupt the breathable nature of traditional buildings, potentially contributing to damp problems.

Does limecrete help with damp?

Limecrete helps regulate moisture naturally by allowing vapour to move through the floor rather than becoming trapped beneath impermeable materials.

Is limecrete suitable for heritage buildings?

Yes. Limecrete is widely used in listed buildings and conservation projects because it is compatible with traditional construction materials.

Can limecrete floors be insulated?

Yes. Modern limecrete floor systems commonly include breathable insulation materials such as recycled foam glass aggregate.

Can underfloor heating be used with limecrete?

Yes. Limecrete works very effectively with underfloor heating systems due to its thermal mass and breathable properties.

Does limecrete crack like concrete?

Limecrete is generally more flexible than traditional concrete and can better accommodate subtle movement within older buildings. This flexibility is one reason it is often used in heritage renovation projects.

How long does limecrete take to cure?

Limecrete cures more slowly than concrete and may take several weeks depending on environmental conditions and floor depth.

Final thoughts

Replacing a concrete floor with limecrete can dramatically improve the breathability and moisture balance of an older building.

While concrete floors may work well in modern construction, they can create problems in traditional properties that were originally designed using breathable materials.

By replacing impermeable concrete with a limecrete floor system, it is possible to create a floor that supports natural moisture movement while also improving insulation and compatibility with historic construction methods.

If you are renovating an older building and would like advice on whether limecrete may be suitable for your project, you can contact our team for further guidance.