Hello everyone,
this is my first post, and I have many questions...
First of all, the topic of controlled ventilation.
We are planning a single-family house using a timber frame construction and have been informed by one of the building companies that with their vapor-permeable wall assembly, no controlled ventilation is necessary. I am uncertain about this, especially regarding the risk of mold.
The wall assembly according to the offer, from inside to outside:
9.5mm (3/8 inch) gypsum board
15mm (5/8 inch) oriented strand board (OSB)
200mm (8 inches) mineral fiber insulation, thermal conductivity class 035
200mm (8 inches) load-bearing timber frame (KVH)
0.2mm vapor-permeable climate fleece
60mm (2.5 inches) cement-bonded render carrier board
--> total exterior wall thickness including exterior plaster: approx. 304.7mm (12 inches)
no vapor barriers, no polystyrene, therefore vapor-permeable
What are your thoughts on this?
Thank you in advance for your opinions.
Fellina
this is my first post, and I have many questions...
First of all, the topic of controlled ventilation.
We are planning a single-family house using a timber frame construction and have been informed by one of the building companies that with their vapor-permeable wall assembly, no controlled ventilation is necessary. I am uncertain about this, especially regarding the risk of mold.
The wall assembly according to the offer, from inside to outside:
9.5mm (3/8 inch) gypsum board
15mm (5/8 inch) oriented strand board (OSB)
200mm (8 inches) mineral fiber insulation, thermal conductivity class 035
200mm (8 inches) load-bearing timber frame (KVH)
0.2mm vapor-permeable climate fleece
60mm (2.5 inches) cement-bonded render carrier board
--> total exterior wall thickness including exterior plaster: approx. 304.7mm (12 inches)
no vapor barriers, no polystyrene, therefore vapor-permeable
What are your thoughts on this?
Thank you in advance for your opinions.
Fellina
Hello,
Please use the search function, as there are already several discussions on this topic. Controlled residential ventilation primarily offers comfort! However, it is generally not strictly necessary nor typically legally required, although the opposite is often claimed. So: Have an independent party, not the seller, verify whether controlled residential ventilation is absolutely necessary under the specific conditions present.
Best regards
Fellina schrieb:
..First of all, the topic of controlled ventilation.
We are planning a single-family house using timber frame construction and received information from one of the home builders that with their diffusion-open wall system, controlled ventilation is not necessary. I am uncertain about the risk of mold in this context.
Please use the search function, as there are already several discussions on this topic. Controlled residential ventilation primarily offers comfort! However, it is generally not strictly necessary nor typically legally required, although the opposite is often claimed. So: Have an independent party, not the seller, verify whether controlled residential ventilation is absolutely necessary under the specific conditions present.
Best regards
Hello Fellina,
As €uro has already mentioned, a mechanical ventilation system with heat recovery (controlled residential ventilation) is not necessarily required or mandatory. Besides a number of advantages, such as consistently good indoor air quality (especially beneficial for allergy sufferers, since it can help achieve a pollen-free environment) in the house, controlled ventilation helps prevent moisture and mold damage, particularly in new builds. Houses built to modern standards require a different user behavior compared to older properties because new builds are much more airtight. At the same time, a controlled ventilation system may be necessary to meet certain building standards in order to qualify for attractive subsidies from funding programs like those offered by KfW. Of course, the installation of a controlled ventilation system involves a certain investment depending on the size and scope of the building.
Regarding the chosen wall construction, it might be worth considering the use of cellulose insulation. The advantage of cellulose, which is blown into the timber frame construction, is, among other things, the improved protection against summer heat. Mineral fiber insulation has only a low heat storage capacity, so the heat generated by solar radiation quickly passes through the material. Basically, it is important to ensure the house stays warm in winter, but also to prevent excessively high temperatures in summer. If necessary, cooling will have to be used, which means the energy saved in winter may be wasted in summer.
Best regards
As €uro has already mentioned, a mechanical ventilation system with heat recovery (controlled residential ventilation) is not necessarily required or mandatory. Besides a number of advantages, such as consistently good indoor air quality (especially beneficial for allergy sufferers, since it can help achieve a pollen-free environment) in the house, controlled ventilation helps prevent moisture and mold damage, particularly in new builds. Houses built to modern standards require a different user behavior compared to older properties because new builds are much more airtight. At the same time, a controlled ventilation system may be necessary to meet certain building standards in order to qualify for attractive subsidies from funding programs like those offered by KfW. Of course, the installation of a controlled ventilation system involves a certain investment depending on the size and scope of the building.
Regarding the chosen wall construction, it might be worth considering the use of cellulose insulation. The advantage of cellulose, which is blown into the timber frame construction, is, among other things, the improved protection against summer heat. Mineral fiber insulation has only a low heat storage capacity, so the heat generated by solar radiation quickly passes through the material. Basically, it is important to ensure the house stays warm in winter, but also to prevent excessively high temperatures in summer. If necessary, cooling will have to be used, which means the energy saved in winter may be wasted in summer.
Best regards
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