Old buildings have always held a special fascination. Their high ceilings, spacious floor plans, stucco decorations, and historic facades tell stories of bygone eras. They lend character to cities and create a special feeling of living. For many, old buildings are synonymous with living culture, character, and comfort. But these very buildings often have weaknesses that have long been overcome in modern new buildings. Insulation in old buildings is often a particular problem. Typical problems include:
- High heating costs due to missing or inadequate insulation.
- Cold walls and draftsthat spoil the feeling of living.
- Clairaudiencebecause partition walls and ceilings were built without sound insulation.
- Moisture and mold growth, favored by inadequately insulated facades and windows.
These problems have a common cause: In the era when many old buildings were built, energy efficiency was not a priority. While solid brick or natural stone walls are durable, they are barely able to retain heat without additional insulation. They lose heat in winter and unintentionally retain heat in summer. In this article, you'll find more information about these problems and learn which insulation options for old buildings can solve them.
Typical old building
Old buildings have a very special charm that modern new constructions rarely achieve. They represent history, craftsmanship, and individuality. Characteristic features include generous ceiling heights that create an airy feeling, ornate stucco ceilings, and historic details such as herringbone parquet flooring, paneled doors, and wooden lattice windows. Their facades also tell stories – from elaborately decorated sandstone ornaments to typical Wilhelminian-era buildings that dominate entire streets. Many people appreciate this charm because it gives apartments a unique character and allows living in an old building to experience a piece of contemporary history.
Typical features of old buildings and their problems
But typical old buildings, along with their charm, also bring with them some problems inherent in classic architecture. The following seven points are typical of this type of construction and can cause the problems listed.
1. Solid walls without thermal insulation
Old buildings (depending on the region, usually built before the 1970s) were typically constructed of solid brick, natural stone, or mixed masonry. The walls were often very thick (30–60 cm), which was considered sufficient at the time to retain heat.
- Problem: These walls have high thermal conductivity. While they retain coolness in summer, they lose heat unchecked in winter.
- Consequence: Cold wall surfaces, energy losses, condensation and the risk of mold.
2. Single glazing for windows
Single-glazed windows were standard until the 1970s. Double- or triple-glazed units with thermal insulation came much later.
- Problem: Heat escapes almost unhindered through the glass.
- Consequence: Drafts, high heating costs and fogged windows.
3. High rooms with poor air circulation
Many old buildings were built with room heights of 3–4 meters – a sign of prestige and comfort at the time.
- Problem: Warm air rises, while it remains cool near the floor. Without modern heating systems, an uneven indoor climate develops.
- Consequence: Residents are freezing despite intensive heating.
4. Ceiling and floor structures made of wood
Wooden beam ceilings were used primarily in residential buildings. Often, only slag or straw was used as filling material between the beams.
- Problem: Hardly any thermal insulation and practically no soundproofing.
- Consequence: Noisiness between floors, heat loss upwards/downwards.
5. Roofs with no or minimal insulation
In older buildings, the roof primarily served as weather protection. Thermal insulation beneath the tiles was uncommon.
- Problem: In winter, up to 30% of the heat is lost through the roof.
- Consequence: High energy costs and heat in summer.
6. Inadequate waterproofing
Foundations and basement walls were often built without or only with primitive waterproofing.
- Problem: Moisture rises into the masonry through capillary action.
- Consequence: Damp walls, salt efflorescence, mold and musty smell.
7. Lack of sound insulation
Until the post-war period, there were hardly any regulations regarding impact sound or airborne sound insulation.
- Problem: Walls and ceilings are thin, and pipes run uninsulated through shafts.
- Consequence: Clairaudience – conversations, footsteps or sewage noises are clearly audible.
The typical construction of old buildings is charming, but from today's perspective, it poses problems in terms of energy efficiency and comfort. Lack of insulation, inadequate sealing, and inadequate soundproofing explain the classic problems of old buildings: high heating costs, cold walls, thin walls, and damp.
Four problems caused by missing insulation in old buildings
The traditional construction of older buildings, where the insulation has not been retrofitted, creates four major problems. These are:
- High heating costs
- Unpleasant indoor climate
- Clairaudience
- moisture and mold
This is because older buildings require up to three times more heating energy than new buildings. Without insulation, heat escapes unhindered through the facade, roof, windows, and doors – and this massively increases energy costs. Furthermore, it is often still cool in winter, while the rooms heat up uncomfortably in summer. There's no buffer against extreme temperatures.
Furthermore, the lack of sound insulation in old buildings is a common problem that significantly limits the quality of living – whether it is footsteps from the neighboring apartment, conversations in the stairwell or traffic noise from outside.
Finally, the lack of insulation in old buildings can not only lead to higher costs or reduced comfort, but also to mold and moisture. Cold exterior walls often lead to condensation. Combined with poor ventilation, mold quickly develops – with consequences for health and the building structure. This mold can necessitate extensive renovations or even cause health problems for residents.
Why good insulation in old buildings is so crucial
Insulating an older building is far more than just a way to reduce heating costs. It offers several benefits:
- Energy efficiency: Less heating energy means lower costs and lower CO₂ emissions. More details on how you Save heating costs with good facade insulation, you can find out in this post.
- Living comfort: Constant temperatures and fewer drafts increase the quality of life.
- Sound insulation: Modern insulation materials reduce noise from outside and inside the house.
- increase in value: Energy-efficient buildings are more in demand and achieve higher sales prices.
- Climate protection: Renovation actively contributes to reducing energy consumption.
Possibilities for retrofitting insulation in old buildings
If you've noticed that your old building's insulation needs to be upgraded, the question arises as to how best to do this. Depending on the property, you have the following options:
- Facade insulation from the outside
- Interior insulation
- roof insulation
- Basement and floor insulation
- Replacing windows and doors
Retrofitting general insulation in old buildings
More details on the question «Which insulation is worthwhile?» find out more in our previous postTheoretically, the most effective solution is exterior insulation. An additional layer of insulation on the facade reduces heat loss across a large area and simultaneously allows for a new design of the exterior walls. However, this is not always possible, either due to structural conditions or due to the possible listed status of the facade of an old building.
Interior insulation is particularly suitable when the historic façade is to be preserved or must be preserved. Modern systems are permeable and prevent moisture damage – however, professional planning is particularly important here. An excellent example of insulation in old buildings with systems installed inside is the ISOnatura® from GIPSAir® GmbH.
Further insulation options for old buildings
As explained above, older buildings often lose the most heat through the roof if it is uninsulated. Whether it's above-rafter, between-rafter, or below-rafter insulation, roof renovation is often the key to massive energy savings.
But basement and floor insulation also offer many advantages. Unheated basements allow cold air to penetrate the building from below. Insulating the basement ceiling or floor keeps rooms warm and protects against energy loss.
Furthermore, leaky windows and doors are typical weak points in older buildings. Replacing them with modern thermal insulation windows or renovating them with new seals will bring immediate, noticeable improvements.
The problem is that the cold in the uninsulated basement penetrates the building and works its way upwards, while the heated, warm air escapes through windows, doors and roof.
Challenges and pitfalls when insulating old buildings
Renovating old buildings is more complex than new construction projects. Typical challenges include:
- Unpredictable building structure: The actual condition often only becomes apparent when work is carried out.
- Monument protection: Restrictions on facade insulation or window replacement.
- Thermal bridges: Irregular construction methods require special attention.
- Humidity: Old walls must be carefully inspected before insulation.
This shows how important specialist knowledge and experience are – mistakes in insulation can, in the worst case, cause mold or structural damage.
Insulation of old buildings as the key to the future of the property
Old buildings are a valuable cultural heritage – but without insulation, their future viability suffers. Professional renovation increases living comfort, reduces energy costs, and protects the building structure. MVM AG supports you in making your old building project energy-efficient. From analysis and selection of suitable insulation materials to professional implementation, we offer customized solutions. Contact us now and receive a non-binding consultation!