KPS
2010-02-02 11:38:06
- #1
Hello @Maiks,
with such complex insulation work in the attic, one should neither rely on an on-site insulation "seller" and the possibly resulting "good feeling," nor on hot tips from internet forums...
Here, only professional competence on-site counts! Measuring is better than looking and guessing...
At this point, only general principles can be shown.
It still applies, for example, that the insulating ability of building component layers should increase outward and the diffusion density should decrease...
For what reason should a functioning building component layer like the straw-clay-tamped mixture be replaced by another with relatively high effort?
Certainly only for a compelling reason, e.g., when the statics allow no other choice to improve the U-value by additional insulation layers... (U-values can be not only calculated, regardless of whether by Glaser or with dynamic calculation methods, but also measured!)
Wood fiber insulation materials have somewhat poorer insulating capacity compared to mineral fiber insulation, but definitely have advantages in summer thermal protection...
For moisture balance, the current filling material is with near certainty excellently suited. (Material moisture should be measured!)
The insulation layer shifts the current dew point outward.
Provided that the airtightness layer functions (measurement verification is strongly recommended), the water vapor transport does not change "for the worse" at all.
Materials are certainly not smarter than their installers!!! (After more than 20 years of installation work and over 10 years of airtightness testing, I have seen enough sealing and insulation misery...!)
One can believe in (certainly well-meaning) half-truths from friends, acquaintances, neighbors, and forum users, but I would rather commission experts with the required knowledge and experience to find an optimal solution based on the actual local conditions... even if this costs a few euros. But they also bear responsibility for their statements or performed services.
Best regards from Erfurt
with such complex insulation work in the attic, one should neither rely on an on-site insulation "seller" and the possibly resulting "good feeling," nor on hot tips from internet forums...
Here, only professional competence on-site counts! Measuring is better than looking and guessing...
At this point, only general principles can be shown.
It still applies, for example, that the insulating ability of building component layers should increase outward and the diffusion density should decrease...
For what reason should a functioning building component layer like the straw-clay-tamped mixture be replaced by another with relatively high effort?
Certainly only for a compelling reason, e.g., when the statics allow no other choice to improve the U-value by additional insulation layers... (U-values can be not only calculated, regardless of whether by Glaser or with dynamic calculation methods, but also measured!)
Wood fiber insulation materials have somewhat poorer insulating capacity compared to mineral fiber insulation, but definitely have advantages in summer thermal protection...
For moisture balance, the current filling material is with near certainty excellently suited. (Material moisture should be measured!)
The insulation layer shifts the current dew point outward.
Provided that the airtightness layer functions (measurement verification is strongly recommended), the water vapor transport does not change "for the worse" at all.
Materials are certainly not smarter than their installers!!! (After more than 20 years of installation work and over 10 years of airtightness testing, I have seen enough sealing and insulation misery...!)
One can believe in (certainly well-meaning) half-truths from friends, acquaintances, neighbors, and forum users, but I would rather commission experts with the required knowledge and experience to find an optimal solution based on the actual local conditions... even if this costs a few euros. But they also bear responsibility for their statements or performed services.
Best regards from Erfurt