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

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

Reports from various countries on the status of the national annexes of ISO 9972 – Spain

Even though air leakage assessment is key towards a better energy performance of buildings, Spain has still not established limitations regarding airtightness. National building regulations in Spain are gathered in the National Building Code (CTE), which was first released in 2006 and updated several times so far.

Directive on the Airtightness of Minergie Buildings (RiLuMi 2018)

The situation in Switzerland is as follows: Neither the Swiss Energy Act nor cantonal energy acts/energy regulations stipulate a legal measurement of airtightness. The current standards of the Swiss Engineers and Architects Association (Schweizerischer Ingenieur- und Architektenverein, SIA) are the latest standards for architecture. The 2014 edition of SIA Standard 180 defines requirements for airtightness with limit and target values. The limit values are to be complied with in a voluntary measurement.

New developments in the field of airtightness measurements and airtightness designs in Switzerland

Purpose of the work

I have already talked about the issue of airtightness designs in Swiss standards at the Buildair Conference in 2015. What are the challenges we are facing two years later, regarding airtightness in Switzerland? And which of the issues in this context could be of interest for other countries?

Airtightness of multifunctional tapes

For several years, multifunctional tapes have increasingly been used for the airtight installation of windows in new buildings or renovation projects. The adhesive tapes are wrapped around the window on three or four sides. After the installation of the window, the tape expands and closes the joints between window and reveal. Their manufacturers sing the praises of these self-expanding joint-sealing tapes made of foam plastic. However, BlowerDoor tests frequently reveal faults. Accordingly, experts vary in their evaluation and discussion of the products.

Recommendations for the optimal and lasting sealing of joints from a hygro-thermal perspective

Purpose of the work

Windows according to the Passive House Standard 2016 require a ten times more airtight airtightness class (EN 14351) [1] than around 1990. The installation layer of the windows is constantly moving closer into the area of the insulating layer with possibly moisture-sensitive materials. Therefore, joint sealing of construction and connection joints must also be evaluated by applying parameters related to building physics like thermal conductivity, diffusion behavior, heat and moisture storage capacity, and the capacity for movement absorption.

Individual and guard-zone measurements in apartment buildings - Measuring results

Purpose of the work

With the German Energy Savings Regulation EnEV 2014 the legislators have qualified the requirements for large apartment buildings (VL > 1.500 m³). In addition to the air change rate (n50 ≤ 3,0 h-1 or n50 ≤ 1,5 h-1 depending on the ventilation technology used) the envelope-based air permeability (q50 ≤ 2,5 m³h-1m-2) is now also required.

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