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 House with Sandwich Elements in Vechta Satisfied Clients The residential estate, a large detached house with a swimming pool, double garage and stables, was viewed, photographed and filmed in detail, inside and out. The architect, Michael Bünker from the IdeeArtisten Planungsgemeinschaft, and the clients, a couple with three children, were interviewed. The clients have been living in this house for one year and they spoke very enthusiastically about the quality of the residential building. Up to now, the clients have not been able to perceive any sounds at all from the roof construction - let alone any loud creaking. In fact, it can be assumed that there is indeed no generation of noise, as all the members of the family have their bedrooms on the first floor of the house and the sandwich construction visible from inside is located above these rooms. Bünker used trapeze profile sandwich elements in the white aluminium shade (RAL 9006) with a component thickness of 140 mm for the roofing of the living section, the swimming pool and the double garage. The same trapeze profile in the same colour, but with a component thickness of 100 mm, was used for the stables. All the visible details of the roof construction above the house, the swimming pool, the garage and the stables were also carried out extremely cleanly, right down to the smallest connection details.
Fig. 4.4.1 Aerial photograph of the building in Vechta with swimming pool, double garage and stables - the floor area is 342 m² (garage 77 m²) and the constructed area is 1,508 m², including fitness room with swimming pool and sauna. The Planning Task Planning Criteria
Fig. 4.4.2 Views of the residential building with swimming pool and double garage
Design Requirements Three simple cubes in a staggered arrangement, of which the centre one (the house) is two-storey, while the other two are single storey, being the fitness room and the garage, have been broken up by window elements to a large extent and are enclosed by a sandwich roof with large overhangs in a flat inclined mono-pitched roof style with 5 degree inclination. The architect Bünker arranged stainless steel consoles, which support the overhanging broad sides of the sandwich elements statically in the eaves area of the two mono-pitched roof constructions and at the ledges of the saddle roof. These consoles are not statically necessary everywhere where the longitudinal sides of the sandwich elements overhang; they thus have exclusively a design function. A continuous frieze made of approx. 12 cm wide stainless steel profile has been installed immediately below the roof elements. Stainless steel bands approx. 12 cm wide have also been worked into the surface of the rendering as an eye-catcher (partial frieze).
Fig. 4.4.7 Entrance area of the residential building (left) with double garage (right)
The entrance area is emphasised by a window element rising over both floors, which illuminates the stairwell. The base consists of dark grey concrete cut stones. Thus, the external colours are restricted to the “silver” of the outer roof skin and its stainless steel end sheet, the white of the rendering (a high quality dirt resisting raw rendering coating), the generous glass surfaces and the dark grey of the base, the synthetic window frames, the doors and the gateway. Further accents are set by the illumination and the sparing planting of the façade. Brightness and light predominate again inside the house. An additional feature is the flooring, in richly varied black granite. In some places in the stair area, this has been augmented with brushed stainless steel and grey steel. This style is continued consistently in the upper storey and is reinforced by the unconcealed sandwich roof with white shade aluminium (RAL 9006). Only in the corridor area has a roof been suspended, in order to conceal supply and ventilation installations. The covering of the sandwich elements was also deliberately omitted in the garage and in the fitness room. The whole floor area is 342 m² (garage 77 m²) and the constructed area including the fitness room is 1,508 m².
Fig. 4.4.11 Stairwell in the residential building
Construktion Forty cm thick, glued laminated girders were introduced transversely to the direction of the sandwich elements in the garage and the fitness room, which were both intended to have areas of 9 x 9 m without intrusive supports. There is one in the garage. In the fitness room, for visual reasons, there are two. The outer walls consist of heat insulating concrete blocks rendered on both sides, 36.5 cm thick. There are no boxes for roller blinds at all. Instead of these, boxes with slatted shading roller blinds and protective mesh against insects were installed outside, in front of the window frames. A ring anchor made of an insulated Poroton shell also forms the upper wall end of the inner longitudinal wall, thus also of the stable and the garage. Laminated headers were screwed continuously against the inner side. These protrude beyond the wall crest, bear the roof elements and hold their screw fixings (stainless steel sealing screws - EJOT system - 6.5/150 for the sandwich element on the stable, appropriately longer in the case of the house). During the shell phase, it emerged that, because of the enormous radiation of heat, the upper flanges of the roof elements extended so much that the laminated header was raised by approx. 2-3 cm in the longitudinal plane relative to the house. It was then screwed against the ground floor roof plate with two steel profile bearers. The heating and ventilation outlets were led to the side, to avoid damaging the roof skin. No facing sheet to protect the synthetic profile filler was used, as this is not exposed to any UV radiation. All edge pieces and metal profiles for this project were manufactured from stainless steel in accordance with the instructions of the architect.
Fig. 4.4.15 Ring anchor for roof element bearer
It is worth considering the detail at the point of the roof connection to the masonry, because of the problem of the heat bridge due to the lower metallic covering layer of the sandwich elements that is present here. In the opinion of the architect, it should be reconsidered whether this damage to the roof shell is really the right solution. It is astonishing in this context that a thermal bridge that is present according to theoretical insights is not perceived as a thermal bridge in practice. It has not been possible to establish any phenomena pointing to a significant migration of heat energy, even on extremely cold days. Thus, even in areas with high ambient air temperatures, for example (bathroom, swimming pool / fitness room), the snow remained lying at the same depth on the sandwich roof. As a comparison, the snow on the roofs of other buildings in the immediate vicinity melted relatively quickly. Here, the client and the architect have taken a different route that can be seen in the management of the details. The intention here was to wrap up the area of the under shell located near the wall, to place the dew-point near the masonry in this way and to protect the masonry lying under it against moisture by means of a z-shaped block. Experience up to now, especially in the extremely damp fitness room, has justified this procedure. It has not been possible to observe any formation of meltwater after operating it for one year. We can probably assume that the effects of the thermal bridge are only theoretical at these points and can thus be disregarded. It has not been possible to establish any constructional, physical problems, even on extremely cold days, although the swimming pool is operated with a water temperature of about 28°C to 30°C and the ambient temperature is about 33°C to 35°C.
Fig. 4.4.16 No temperature separating division was made at the overhanging sandwich elements
Fig. 4.4.17 Continuous laminated headers bear the sandwich elements and hold their screw fixings
Finding Installation Time Building Costs Heat Conservation
Fig. 4.4.20 Interior view of the sandwich roof in the fitness room
Fig. 4.4.21 Detail of the longitudinal connection of the sandwich elements
Fig. 4.4.22 Light strip in the first sector of the stabling roof
Fig. 4.4.23 Southern façade of the house Installation / Installation Company Under normal conditions, it is possible to imagine that this problem would lead to a change in the method of construction. However, in this case, where the architect and the clients were united in their conviction, the search continued until a structural joiner, who also carried out the construction of the header constructions of the roofs, declared that he was prepared to install the sandwich elements. Although the joiner was confronted with these light components for the first time, it was possible to carry out all details in a technically perfect, and visually flawless, manner. Authors Michael Bünker
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