The design of the new middle school in Holzkirchen is picking up speed.
Now the municipal council has made decisions about the construction and installation of ventilation systems.
Wooden churches
- Two fundamental decisions on the construction of the new middle school on Baumgartenstrasse recently drove the Holzkirchen council to a halt. Initially, the focus was on the construction proposed by the architects “karlundp” in March: to erect the supporting structure of the school building in a wood hybrid construction. So that reinforced concrete is used, but the facade consists mainly of wooden elements. Nevertheless, following a suggestion at a municipal council meeting in spring, it was examined whether the supporting structure of the new building could also be made of wood. This idea was incorporated into a feasibility study with a rough cost estimate. Ludwig Karl, managing director of "karlup", presented the results. He made it clear that both types of construction could be implemented. The biggest difference is to be seen inthat with the wooden form, the ceilings and the load-bearing interior walls are also made of wood.
Pure wood construction variant more expensive than wood hybrid construction
However, this variant goes hand in hand with "increased effort in terms of fire and noise protection," emphasized Karl. He emphasized: “Timber construction is currently booming.” As positive as that is, it is of course accompanied by strong demand for materials. In other words: the procurement costs are higher. “On the other hand, the tender will probably only be in a year. We don't know how many companies will then have capacities - there may also be additional costs, ”Karl pointed out when our newspaper asked our newspaper. That is why he conventionally rates a shell as “lower risk”. In addition, as part of the feasibility study, it was found that - one way or another - the stairwell, shaft and reinforcement walls cannot be made of wood. For this you have to use reinforced concrete. “It's much more economical,” says Karl.In terms of timing, there would be little difference. “Timber construction needs more planning in advance with the carpenters, but the construction is then much faster. According to a rough estimate, the additional costs for the more sustainable version can be estimated at 1.1 million euros.
Greens Council: "Are here in the heart of the sawing industry in Central Europe"
This increase in costs prompted CSU spokesman Sebastian Franz to speak out in favor of the wood hybrid construction. Martina Schweighofer distanced herself from this within the parliamentary group. Mayor Christoph Schmid (CSU) said that both variants are hybrid. “The one with a lot of wood, the other with less.” Here Robert Wiechmann (Greens) hooked: “The original variant only provides for an external facade made of wood - and that is very little.” He commented, “Here in the heart of the sawmill industry in Central Europe ”and called to mind that they had already had“ best experiences ”with timber construction at the Anton Weilmaier School in Hausham. In the end, however, the vote resulted in a majority in favor of the wood-hybrid variant. Six councils opposed it.
Holzkirchen Middle School: 1.4 million euros for the installation and maintenance of a ventilation system
There was a little more consensus regarding the installation of a mechanical ventilation system. Christian Friedl, managing director of Ecoplan, presented a cost estimate via video switch. He emphasized in advance that there is no legal requirement for this installation. Nevertheless, it is recommended by specialist planners and politicians with a view to the proven reduction in the risk of corona infection in classrooms, said Friedl. "It is a measure to improve indoor air hygiene, the success of which will continue even after the end of the pandemic," said the Ecoplan managing director. According to him, the devices would "exchange room air five to six times an hour". This requires "extensive operating instructions", since the systems are designed to be operated by individual users.According to Friedl, the cost of installing this mechanical ventilation system is around 1.4 million euros. This includes the ancillary costs, installations, electronics and purchase. Annual electricity costs of around 10,000 euros and operating and maintenance costs of around 20,000 euros are significant. With two votes against, the municipal council nevertheless decided to install the system.
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