ᐅ Installation level including insulation – impact on exterior wall insulation?
Created on: 26 Feb 2024 15:01
F
Flitz86
Hi,
As part of my renovation project, the exterior wall of the "original building" will be insulated with 10cm (4 inches) mineral wool insulation boards (WLG035).
The exterior wall is a 24cm (9.5 inches) wall made of Liapor blocks.
So far, there was only internal insulation with 5cm (2 inches) polystyrene.
For the renovation, I now want to add an installation layer on the interior wall. In one area because I need to (heating pipes with insulation >> 10cm (4 inches)) and in another area because I hope the electrical installation will be much easier instead of chasing channels, etc. Structural considerations must also be kept in mind here. Until now, everything was contained within the 5cm (2 inches) polystyrene.
That means I want to add an installation layer of 4cm (1.5 inches) and 10cm (4 inches) thickness onto the interior wall, which will also be insulated (also with a mineral-based insulation material) + 15mm (0.6 inches) OSB + 12.5mm (0.5 inches) drywall.
Is there anything to consider or clarify regarding the insulation on the exterior wall? Or can I proceed without any issues?
I have read various reports about "dew point shift," etc., and am therefore uncertain...
Regards,
Chris
As part of my renovation project, the exterior wall of the "original building" will be insulated with 10cm (4 inches) mineral wool insulation boards (WLG035).
The exterior wall is a 24cm (9.5 inches) wall made of Liapor blocks.
So far, there was only internal insulation with 5cm (2 inches) polystyrene.
For the renovation, I now want to add an installation layer on the interior wall. In one area because I need to (heating pipes with insulation >> 10cm (4 inches)) and in another area because I hope the electrical installation will be much easier instead of chasing channels, etc. Structural considerations must also be kept in mind here. Until now, everything was contained within the 5cm (2 inches) polystyrene.
That means I want to add an installation layer of 4cm (1.5 inches) and 10cm (4 inches) thickness onto the interior wall, which will also be insulated (also with a mineral-based insulation material) + 15mm (0.6 inches) OSB + 12.5mm (0.5 inches) drywall.
Is there anything to consider or clarify regarding the insulation on the exterior wall? Or can I proceed without any issues?
I have read various reports about "dew point shift," etc., and am therefore uncertain...
Regards,
Chris
nordanney schrieb:
On the topic of dew point shift: ubakus – you can plan a lot yourself there ==> but with interior insulation and no additional measures, it doesn’t look good (unless you simply leave out the interior insulation). Please do NOT use Ubakus for moisture protection verification with interior insulation. Ubakus’ standard moisture protection calculation, which uses a 2D finite element method, accounts only for diffusion processes—no convection or capillary transport.
Also, the alternative calculation method based on DIN 4108-3 must not be applied to most assemblies; instead, a calculation method considering all transport processes throughout the year must be used. For this, a tool like the Wufi calculator can be applied. However, your energy consultant should know this and provide these calculations. After all, it is called “professional planning.”
Flitz86 schrieb:
Basically, I’m not concerned with whether this is sensible or not, but more with the question:
Could this create any unintended effects or lead to problems? See above!
Flitz86 schrieb:
I have now received information from my energy consultant that I can install the installation level without worries since it is located in the warm zone—as exterior insulation is also applied. Did he actually calculate that or just assume it? Generally, the wall assembly does not seem critical. However, the airtight layer and vapor retarder layer definitely need to be defined; your consultant should determine this in any case.