Preventing undesired heating of drinking water is a constant point of attention in the residential con-struction. If pipes are concealed in the screed, there is a good chance that the drinking water pipes will cross the heating pipes. Especially when the drinking water stagnate in the pipeline, a so-called hot spot is created. At that location the temperature of the drinking water can exceed a temperature of 25 °C, which increases the chance of the growth of legionella and other bacteria.
2 Publication ISSO-SBR-811
Publication ISSO-SBR-811 pays attention to concepts to prevent hot spots and offers solutions for common situations where hot spots can occur. The publication provides practical solutions for all parties involved in the construction of new homes and apartments.
ISSO-SBR-811 distinguishes three solution directions.
• Cool strips in the screed
• Cool strips above the ceiling
• Cool surfaces in construction floor and screed
3 Contents of the presentation
The presentation considers:
• An explanation of the approach to design legionella safe houses and apartments.
• An explanation of the three solution directions.
• The requirements for each member of in the design team.
• The role for each member in the design team.
• Solutions to install and construct legionella safe houses and apartments.
• Tables with the minimum distance between the drinking water pipes and heating pipes
Presentation of the author
Walter van der Schee BSc is an employee of Croonwolter&dros based in Amersfoort the Netherlands. He is responsible for mechanical and plumbing design and construc-tion in commercial buildings.
As a member of the Dutch Technical Association for Building Installations (TVVL), he is one of the experts consulting for Plumbing technologies.