Matthias_1212
2021-05-19 07:34:17
- #1
Dear forum community,
after we have now found a plot of land, it is time to specify the technical building equipment.
We want to have a KFW55 house with a heat pump built. So far so good. After diligently reading the forum, I was actually sure that we also need a central controlled residential ventilation system (we are at the office all day and will probably not be able to carry out the necessary shock ventilations for air and humidity exchange).
Our builder believes that a central controlled residential ventilation system is not necessary with his construction method due to the use of lightweight expanded clay aggregate. In addition, he installs a Regel-Air system in the windows. A controlled residential ventilation system is installed by him - if at all - once a year. With over 100 houses per year. In his opinion, the situation would be completely different with Ytong. There, a controlled residential ventilation system is always necessary.
If we still insist on a controlled residential ventilation system, the additional costs are about 15,000€ for the device (Pluggit) and 8,000€ for raising the walls on the upper floor and the screed on the upper floor. So a total of 23,000€. According to the reports here in the forum, I consider the surcharge very high.
Our builder builds with lightweight expanded clay aggregate. The wall structure is roughly:
- 15cm lightweight expanded clay aggregate
- 19cm insulation
- vapor barrier and exterior plaster
Total wall structure: approx. 35cm
I cannot assess the builder’s statements. Do you really not need a controlled residential ventilation system with lightweight expanded clay aggregate because the properties regarding humidity are so good?
I would be very grateful for your help.
Best regards
Matthias
after we have now found a plot of land, it is time to specify the technical building equipment.
We want to have a KFW55 house with a heat pump built. So far so good. After diligently reading the forum, I was actually sure that we also need a central controlled residential ventilation system (we are at the office all day and will probably not be able to carry out the necessary shock ventilations for air and humidity exchange).
Our builder believes that a central controlled residential ventilation system is not necessary with his construction method due to the use of lightweight expanded clay aggregate. In addition, he installs a Regel-Air system in the windows. A controlled residential ventilation system is installed by him - if at all - once a year. With over 100 houses per year. In his opinion, the situation would be completely different with Ytong. There, a controlled residential ventilation system is always necessary.
If we still insist on a controlled residential ventilation system, the additional costs are about 15,000€ for the device (Pluggit) and 8,000€ for raising the walls on the upper floor and the screed on the upper floor. So a total of 23,000€. According to the reports here in the forum, I consider the surcharge very high.
Our builder builds with lightweight expanded clay aggregate. The wall structure is roughly:
- 15cm lightweight expanded clay aggregate
- 19cm insulation
- vapor barrier and exterior plaster
Total wall structure: approx. 35cm
I cannot assess the builder’s statements. Do you really not need a controlled residential ventilation system with lightweight expanded clay aggregate because the properties regarding humidity are so good?
I would be very grateful for your help.
Best regards
Matthias