Innenwand dämmen ohne Schimmel – 5 Dinge auf die du achten solltest!

Summary

This video discusses the process of interior wall insulation, focusing on when and why it's necessary. The presenter, a certified building technician, explains the importance of proper preparation, including checking for moisture and removing plaster. Key points include avoiding insulation if moisture is present, managing window insulation, and addressing thermal bridges in adjacent walls. The video highlights the use of natural building materials like wood fiber and hemp fiber and advises on insulation thickness. A specific wall construction method using clay and insulation boards is also recommended.

Takeaways

• 😀 Only insulate interior walls if exterior insulation is not possible.
• 🏠 Proper preparation is essential before starting interior wall insulation.
• 🪟 Windows must be insulated with the same thickness as the interior wall insulation to avoid condensation.
• ⚠️ Avoid using interior insulation if the exterior wall is consistently wet.
• 💧 If the building is old and subject to rising damp or salt buildup, address those issues before insulating.
• 👷‍♂️ Gypsum plaster should be removed before insulation because it cannot handle moisture.
• 🔨 Check for existing layers like felt or foil in the wall before starting the insulation process.
• 🧱 Consider using natural insulation materials like wood fiber or hemp fiber for better performance.
• 🏡 Insulate the connecting interior walls slightly to prevent cold bridges.
• ⚡ Limit insulation thickness to 40-60mm to avoid moisture issues, and use clay plaster as a moisture buffer.

Q & A

Why is interior insulation recommended only when exterior insulation is not possible?

Interior insulation is recommended only when exterior insulation is not feasible because exterior insulation is generally more effective. It avoids issues like cold areas and thermal bridges, which can lead to condensation and mold. However, interior insulation is necessary in cases like historical preservation, cost concerns, or architectural limitations.

What are the key preparations required before installing interior insulation?

Key preparations include checking for rain exposure on the building’s exterior, assessing moisture levels, inspecting for salt damage, and ensuring there are no existing moisture problems like rising damp. These issues should be addressed before proceeding with interior insulation to avoid trapping moisture.

Why is it important to remove gypsum plaster before adding interior insulation?

Gypsum plaster must be removed before adding insulation because it cannot handle moisture well. If insulation is added over gypsum, condensation can occur at the interface, causing the plaster to deteriorate and compromise the insulation system.

What role do windows play in interior insulation, and what should be considered?

Windows are critical in interior insulation because the thermal insulation of window reveals must match the wall insulation to avoid condensation. This can be challenging if windows are already installed, as it may limit the thickness of insulation that can be added around them.

What are ‘flanking elements,’ and why are they important in insulation?

Flanking elements refer to interior walls that connect to the exterior insulated walls. These can create thermal bridges if not properly insulated, leading to cold spots and potential condensation. It's important to extend insulation slightly into these areas to maintain consistent thermal performance.

What is the recommended thickness for interior insulation, and why?

The recommended thickness for interior insulation is typically 40-60 mm. Insulating thicker than this can shift the dew point too far into the wall, increasing the risk of condensation and moisture problems. Thicker insulation also makes the wall more difficult to keep dry.

What is a typical material setup for interior insulation?

A typical setup involves a base layer of clay for moisture buffering, followed by a wood fiberboard for insulation, and finished with another layer of clay plaster. This arrangement helps manage moisture and provides effective thermal performance without needing a vapor barrier.

Can a vapor barrier be omitted in interior insulation, and if so, why?

Yes, a vapor barrier can often be omitted if materials like clay are used, as they naturally regulate moisture. The clay acts as a buffer, allowing water vapor to move through without causing condensation, making additional vapor barriers unnecessary in many cases.

What are some common issues when insulating around windows?

Common issues include insufficient space for insulation due to existing window frames, leading to condensation at the window edges. Solutions include removing or adjusting window reveals or increasing the thickness of insulation in these areas to prevent cold bridges.

How does the insulation material choice affect the performance of interior insulation?

Different materials, like wood fiber or hemp fiber, affect the thermal and moisture management properties of the insulation. Each material has its strengths, with some offering better breathability or moisture buffering. Choosing the right material depends on the specific conditions of the building.