Hello everyone,
we are currently deciding on the wall construction for our bungalow, considering cost, thermal insulation, and soundproofing (possibly also vapor permeability).
I am looking at two options:
Additionally, the roof will be insulated with ISOVER Integra ZKF 1 - 031 between-rafter fleece, 40 cm (16 inches) thick, and equipped with a vapor retarder (ISOVER Vario® Xtra Safe), designed as a cold roof. We will probably install a central ventilation system, but it should also ensure a good indoor climate without mechanical ventilation.
One more note: With the mineral wool option, the detailing of the base of the wall (plinth) is naturally a bit more challenging. Or is it also possible to align the mineral wool insulation boards flush with XPS/plinth insulation boards using a reinforcement mesh, as shown in the Sto detail?
Are there any opinions on this topic in the forum?
Thanks in advance.
we are currently deciding on the wall construction for our bungalow, considering cost, thermal insulation, and soundproofing (possibly also vapor permeability).
I am looking at two options:
| Base layer | Poroton-Planziegel-T14-24.0 cm (9.4 inches) L (load-bearing substrate) | Poroton-Planziegel-T14-24.0 cm (9.4 inches) L (load-bearing substrate) |
| Insulation layer | Insulation boards Sto-EPS Insulation board Polar II 032 NF (20 cm / 8 inches) bonded with StoLevell Uni | Insulation boards Sto-mineral wool board 2/B/H4 W5 (20 cm / 8 inches) bonded with StoLevell Uni |
| Base coat | StoArmat Classic plus F/M/G with reinforcement layer: Sto fiberglass mesh | StoArmat Classic plus F/M/G with reinforcement layer: Sto fiberglass mesh |
| Intermediate coat | ]StoPrep Isol Q | |
| Top coat | StoSilco® K/R/MP | StoSilco® K/R/MP |
| Thermal insulation U-value (W/(m²K)) | 0.121 | 0.130 |
| Soundproofing | - | - |
| Vapor permeability | - | ]+ ?however, it is coated? |
| Cost | + | + approx. 20%[ |
Additionally, the roof will be insulated with ISOVER Integra ZKF 1 - 031 between-rafter fleece, 40 cm (16 inches) thick, and equipped with a vapor retarder (ISOVER Vario® Xtra Safe), designed as a cold roof. We will probably install a central ventilation system, but it should also ensure a good indoor climate without mechanical ventilation.
One more note: With the mineral wool option, the detailing of the base of the wall (plinth) is naturally a bit more challenging. Or is it also possible to align the mineral wool insulation boards flush with XPS/plinth insulation boards using a reinforcement mesh, as shown in the Sto detail?
Are there any opinions on this topic in the forum?
Thanks in advance.
N
nordanney22 Nov 2025 08:17- Use what the company installs
- Mineral wool is about 20% more expensive
- Mineral wool is slightly more difficult to work with
- The type of insulation makes exactly zero difference to the apartment
- Both are still classified as special waste
My choice: EPS, which offers absolutely no benefits compared to mineral wool
P.S. The indoor climate is the same regardless of the wall construction. Without ventilation, you will always have a noticeable stale smell (for proof, buy some air quality meters later). So, install controlled mechanical ventilation
- Mineral wool is about 20% more expensive
- Mineral wool is slightly more difficult to work with
- The type of insulation makes exactly zero difference to the apartment
- Both are still classified as special waste
My choice: EPS, which offers absolutely no benefits compared to mineral wool
P.S. The indoor climate is the same regardless of the wall construction. Without ventilation, you will always have a noticeable stale smell (for proof, buy some air quality meters later). So, install controlled mechanical ventilation
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