Airflows and moisture sources in lightweight wall structures

Purpose of the work

Quantification and location of moisture penetration through leak-dependent creeping flows from the room into insulated, lightweight wall structures as a function of design, pressure differential, and leak position.

Method of approach

Pressure-dependent, high-precision through-flow measurement in a facade test stand and determination of the amount and distribution of condensate in a double climate chamber performed on lightweight wall sections with different cavity wall insulation and leak positioning.

When airtightness alone is not enough: Structural damage due to flank convection

Purpose of the work

All too often, we experts and measurement technicians are totally fixated on airtightness issues. Based on three practical cases, I would like to demonstrate that windproofness, minimal convection in the insulation layer, and the convective separation of different structural elements from one another should also be taken into account in order to prevent structural damage.

Method of approach

The topics

Airtight interface connections in the elements

Purpose of the work

This lecture addresses the problems that arise when wall and roof sections are broken down into prefabricated elements.

Content of the contribution

Special features of air sealing in historical timber constructions

Purpose of the work

The load-bearing structures of historical wooden buildings have a large number of joints and penetrations that are difficult to seal. For reasons of preservation of historical monuments, wooden buildings often have to be sealed at the interior of the load-bearing structure. The existing substrates in these areas are not well suited for proper execution and, as a complicating factor, the load-bearing structures or parts of these should often remain visible.

Method of approach

Adhesives are finally regulated: DIN 4108-11

Establishing an airtight building envelope requires both materials for the surfaces and joining materials for the airtight sealing of joints between components and penetrations, as well as splices and overlappings. In wooden structures, airtight sheeting or sheeting materials are generally used as an air barrier on the surface. Any splices and overlappings are generally bonded with adhesive tape. Joints at adjacent components are often created using paste-like adhesive compounds. DIN 4108-7 (airtightness of buildings) provides a large number of examples of joints with adhesive bonds.

Most frequent planning and installation errors in ventilation systems

Purpose of the work

Improve the effectiveness and performance of ventilation systems. Are there hygienic concerns regarding a ventilation system?

Method of approach

Practical experience as an expert in the field

Content of the contribution

DIN 1946-6 and window ventilation

Purpose of the work

Is a ventilation system mandatory in airtight buildings? To what extent can users still be responsible for ventilation in modern buildings?

Method of approach

Evaluation of decision-making criteria for ventilation; normative specifications for the ventilation concept; energy efficiency potential of ventilation

Content of the contribution

Feedback on full ventilation system reconditioning in a non-standard sealed building

Purpose of the work

This paper deals with the feedback of a full of a ventilation system reconditioning in a non- standard sealed building. This volume was previously retrofitted and immediately shows many difficulties to maintain good indoor air quality in some parts of the occupied volume. Indeed, a permanent well functioning of the ventilation system is essential in a sealed building without openings to ensure a good indoor air quality.

Method of approach

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