ᐅ Solid Wood House – Sound Insulation and Thermal Protection

Since we are facing a similar decision, the supplier of the solid wood house offered us the chance to visit a nearly completed solid wood house of a colleague on a warm day so we could get an impression. The outdoor temperature was 25°C (77°F), and when we entered the house, it was pleasantly cool inside. One room on the ground floor was slightly warmer, but it was not shaded during the day. The attic had roughly the same temperature as the ground floor. Therefore, I can only agree with @haydee that shading plays a major role. In my opinion, the wall material is of secondary importance.

Of course, the wall construction is important in both options. In this solid wood house, the wooden wall thickness is 200mm (8 inches) plus 120mm (5 inches) of wood fiber insulation boards. Alternatively, we could go for a 240mm (9.5 inches) thick wooden wall. That should of course help with sound and heat insulation.

@superzapp

Thermal insulation has been proven with 20cm (8 inches) of mineral wool insulation.
Is there an official approval or certification for this?

In addition to adding mass to a timber roof, such as double drywall, ventilation should not be underestimated, as it allows the mass to cool down, especially at night.

A ventilated roof space would also be worth considering.

One should not lose sight of the fact that the lambda value of solid wood is quite high, with typical densities around 450kg/m³ (28 lb/ft³). This corresponds to a thermal conductivity of about 0.12 W/mK. However, densities can also reach over 700kg/m³ (44 lb/ft³). This means that much depends on the solid wood itself and the airtight sealing, which also needs to accommodate the natural movement of the wood.

parcus schrieb:

@superzapp

The thermal insulation has been verified with 20cm (8 inches) of wood fiber insulation.
Is there a source for the approval of this?

In addition to adding mass to a wooden roof like double gypsum board, ventilation should not be overlooked, as it allows the mass to cool down, especially at night.

A ventilated air gap behind the roof covering would also be an important point.

Hi, sorry. From the discussions with the architect and the building authority, I got confused and had incorrect figures and data in mind.

Here is the current roof construction from PHPP

hesselberg_01 schrieb:

...An important factor in both options is of course the wall construction. In this solid wood house, the wooden wall thickness is 200mm (8 inches) plus 120mm (5 inches) wood fiber insulation boards. Alternatively, we could also consider a 240mm (9.5 inches) thick wooden wall. This should, of course, help with sound and heat insulation.

That seems like a very high proportion of wood. What is the total thickness of the wall construction? I would be very interested in the exact wall build-up!

Our wall is “only” 10cm (4 inches) Glued Laminated Timber and has a total thickness of 44cm (17 inches). With this and other measures, we achieve KfW40(+).

I already suspected that it cannot be verified with HWL, as the lambda values are too poor for that.
For heat protection, a single layer of drywall is not sufficient and should always be applied in two layers on wooden structures.