Peripheral Insulation: Complete Guide for Switzerland

Perimeter insulation is an essential technique for improving the energy efficiency of buildings. In Switzerland, where winters can be harsh, good insulation is crucial to guaranteeing comfort and reducing energy costs. 

The aim of this article is to provide you with a complete understanding of perimeter insulation, its benefits, the different types available and the regulations in force.

Why is perimeter insulation essential?

Perimeter insulation plays a key role in reducing heat loss. Not only does it reduce heating costs, it also improves the thermal and acoustic comfort of homes.

1. Improving energy efficiency Perimeter insulation: By preventing heat from escaping, perimeter insulation reduces the energy needed to heat a house.
2. Lower heating costs Less waste heat means less heating required, which translates into lower energy bills.
3. Thermal and acoustic comfort Good insulation reduces cold draughts and outside noise, creating a more comfortable indoor environment.

The different types of perimeter insulation

There are several methods of insulating the perimeter walls of a building, each with its own advantages and disadvantages.

1. External insulation This involves laying an insulating layer on the outside walls, providing continuous protection against heat loss.
2. Internal insulation This method involves adding insulating materials to the inside of the walls, making it ideal for renovations where the outside appearance needs to be preserved.
3. Materials used Commonly used materials include glass wool, rock wool, expanded polystyrene and vacuum insulation panels (VIPs). Each of these materials offers different performances and costs.

The benefits of Peripheral Insulation

Perimeter insulation offers many advantages for building owners in Switzerland.

• Energy savings Effective insulation can reduce heating requirements by 20 to 30 %.
• Improvement in property value : Well-insulated houses are more attractive on the property market.
• Building sustainability Perimeter insulation: By protecting external walls from temperature variations and damp, perimeter insulation contributes to the longevity of structures.
• Reducing the carbon footprint : By consuming less energy, well-insulated homes emit fewer greenhouse gases.

Regulations and standards in Switzerland

Switzerland has strict building insulation standards. Owners must comply with specific regulations to improve the energy efficiency of their homes.

Legal requirements

Buildings must meet certain energy performance requirements. In Switzerland, the Energy Act (Federal Energy Act) and the Energy Ordinances (Energy Ordinance) govern these requirements. 

Energy standards and certifications

Labels such as Minergie guarantee that buildings meet high standards of energy efficiency. Minergie is a Swiss sustainable construction label for new and renovated buildings. 

Directive SIA 380/1

The SIA 380/1 standard is a guideline issued by the Swiss Society of Engineers and Architects (SIA) that specifies minimum requirements for the thermal insulation of buildings. It is used as a reference for new buildings and renovations. 

Buildings programme

This programme is a joint initiative by the federal government and the cantons to encourage energy-saving measures in buildings. It offers subsidies for energy renovations, including perimeter insulation. 

Installation process

Perimeter insulation must be installed with care to ensure its effectiveness. Here is a detailed guide to the various stages of the process:

Surface preparation

Before applying insulation, it's crucial to ensure that the wall surface is clean and in good condition. Here are the key steps:

1. Cleaning Remove all dirt, dust, mould and other contaminants from wall surfaces. Use a stiff brush or high-pressure cleaner for exterior surfaces.
2. Repair Check the walls for cracks, holes or damaged areas. Repair these defects with a suitable plaster or mortar to ensure a smooth, even surface.
3. Treatment Apply an anti-foam or anti-fungal treatment if necessary to prevent the reappearance of mould.

Application Techniques

Different techniques can be used depending on the type of material and the structure of the building. Here are the most commonly used methods:

External insulation (ITE) :

• Rigid panels Fix rigid insulation panels (expanded polystyrene, rock wool) to the outside walls using plugs and special glue.
• Insulating formwork blocks : Use insulating formwork blocks like those from Isovariant. These blocks incorporate both a formwork structure and effective insulation, simplifying the installation process and guaranteeing continuous insulation.
• Coating Apply a base coat to the panels, followed by a fibreglass reinforcement to strengthen the coating. Finish with a decorative top coat.
• External thermal insulation system (ETICS) Combines the use of insulating panels, coatings and mechanical fixings to provide complete insulation.

Internal insulation (ITI) :

• Semi-rigid panels Fix semi-rigid insulation panels to interior walls using wooden or metal frames.
• Sprayed insulation Apply foam insulation materials (polyurethane, cellulose) directly to the walls using a spray gun.
• Blown-in insulation Blow loose insulation materials (cellulose wadding, perlite) into wall cavities.

Precautions to be taken

It is important to ensure that the insulation is continuous and uninterrupted to avoid thermal bridges. Here are a few precautions to take:

1. Continuity of insulation Make sure that the insulation panels are installed without gaps or cracks. Use special adhesive strips to seal the joints between the panels.
2. Airtightness Apply vapour-barrier membranes or waterproofing films to prevent moisture penetrating the insulation, which could reduce its effectiveness.
3. Insulation of sensitive points Pay particular attention to sensitive areas such as wall and roof junctions, window and door frames, and ventilation ducts. Use specific insulating materials for these areas.
4. Compliance with safety standards Wear personal protective equipment (gloves, goggles, masks) when handling certain insulating materials (such as glass or rock wool) to avoid skin and respiratory irritation.

If you're not sure you can carry out these steps yourself, or if you want to guarantee optimum installation, you can rely on the services of thermal insulation specialists. Using insulating formwork blocks like Isovariant can simplify installation and improve the efficiency of your perimeter insulation.

Costs and financing

The cost of perimeter insulation can vary depending on the materials used and the surface area to be covered.

1. Cost estimates : Perimeter insulation projects can cost between CHF 100 and 200 per square metre.
2. Subsidies and grants In Switzerland, a range of subsidies and financial aid is available to encourage improvements in the energy efficiency of buildings. [Source: Swiss Federal Office of Energy (SFOE)]

Sources and references

To find out more about perimeter insulation and regulations in Switzerland, consult the following sources:

– Swiss Federal Office of Energy (SFOE)

– Minergie

– Energy-environment.ch

Conclusion

Installing perimeter insulation is a complex task that requires careful preparation and precise application. By following these steps and taking the necessary precautions, you can guarantee effective insulation that improves the energy efficiency of your home.energy efficiencythe thermal comfort and the sustainability of your building. For optimum results, it is often advisable to call in qualified professionals. Using innovative solutions such as Isovariant insulating formwork blocks can also help to simplify the process and ensure high-quality insulation.