Airtightness is required by law in Germany. The German Energy Saving Ordinance (EnEV), which stipulates minimum requirements regarding energy use in new and renovated buildings, and the standard DIN 4108 Parts 2 and 3 on thermal protection both require permanently airtight building envelopes. The reason for this is simple: thermally insulated buildings must be built in an airtight manner if they are to be energy-efficient, deliver sufficient comfort levels and also provide protection against moisture damage. pro clima offers an all-round system for this purpose, with solutions for flat surfaces, joints, adhesive bonds and detail features. In addition, installation technicians and architects can benefit from a comprehensive range of services, including our Engineering Hotline, component testing, building-physics assessments and on-site training.
1. Summary of general information
An initial design concept will summarise the most important general information relating to the construction project. This will include the location, construction method, financial support programmes and their aims, details of building services technology, etc.
2. Drawing of the general course of the airtightness layer
As an initial planning step, the general course of the airtight building envelope is specified and included in cross-section and floor-plan drawings for the building. The airtight building envelope should ideally fully enclose the heated volume of the finished building.
3. Specification of airtightness in the standard component structures
The next step is to define the standard structure of all relevant components of the building envelope, such as the roof, exterior walls, basement ceiling, etc. This specifies precisely which component layer will perform the airtightness function for surfaces. This could be the reinforced concrete slab in the case of a basement ceiling, or the interior plasterwork for exterior walls. This should be documented in the form of a table, as a detailed written description, or as labelling on cross-section and floor-plan drawings.
4. Specification of the course of airtightness sealing and marking of detail features
The airtightness layers are marked and highlighted with a coloured line for each component in cross-section and floor-plan drawings. Any joint details that arise – e.g. at transitions between building components, penetrations or other joints – are marked with a coloured circle. As a check, it must be possible to trace along the airtight building envelope with a pen without having to lift the pen (i.e. no gaps or jumps). This is the so-called “pen test”.
5. Sketching of the air sealing at detail features
In this step, the marked joint details are shown in a rough manner in simplified sketches and general instructions are provided. A very simple, schematic illustration is sufficient for the initial design concept. It is not necessary to carry out detailed construction planning for the various trades. Hand-drawn sketches or construction site photos may be used here, for example. The aim is to draw attention to critical points – e.g. that the entire surface of masonry walls behind stud-wall installations needs to be plastered. Detailed construction planning is not necessary when preparing an initial airtightness design concept, but is instead the responsibility of the relevant planner.