Heat protection in new construction

Hi everyone,

the topic of thermal insulation is always widely discussed everywhere... but what about the topic of heat protection? We are a bit, well, let's say clumsy in that regard.

We are getting a timber frame construction with the following build-up from inside to outside:
- Gypsum board, OSB 12mm, 4x6 battens construction for the installation level, 18mm OSB, vapor barrier layer,
6x20 cm structural timber frame filled with glass wool Thermolan Unifit 035 200 mm, 16mm DWD board (or alternatively a wood fiberboard),
sheathing membrane, air layer, 11.5 cm thick facing brickwork.

In the roof area 240 mm glass wool (Thermolan Unifit 035) between the rafters, black clay roof tiles.

Now we know, however, that mineral wool is not intended to protect against heat in summer. The idea was to omit the 16mm DWD board on the outside and instead use a 32mm wood fiberboard.

But before we overturn the planning, how good is the heat protection in a house like this with glass wool and a facing brick? Is the heat protection perhaps so good that one is only unnecessarily worrying?

Of course, due to our 20-year-old apartment on the top floor, we are exposed to extreme stuffy heat in summer and definitely do not want to go through that again in the new building.

Heating through windows is counteracted by blinds, etc., and new triple-glazed windows with a U-value of 0.5, Velux windows are the 5-star ones that have good heat protection.

The house should not be a refrigerator in summer, but it should be comfortable to endure inside without sweaty nights where you wake up with headaches and worry whether the child is too warm in bed.

Before any misunderstandings arise, we know that with insulation materials it depends on how high the heat capacity is. In other words, high storage capacity, which delays heat transfer over time and smooths out temperature peaks.

Hi,

this is one of the two main reasons why I am considering cellulose insulation for my planned construction (timber frame with a similar structure, but plaster instead of facing brickwork). The second reason is soundproofing.

Regards
I.

Hello,

with the outer masonry shell, I am now assuming solid brick/clinker, you have already chosen a material with high heat storage capacity. However, since this is the outer layer, it heats up the most on the south side, quite strongly on the west, and less on the east and north. This heat is retained overnight and only slowly released again, preventing heat peaks and strong temperature fluctuations inside, but also a rapid cooling. Should we unexpectedly have a very long and hot summer again, the house will heat up quite strongly on the facade and release the heat only slowly, unlike "insulation-only houses" that cannot store heat.

I consider your wall construction suitable to ensure protection against summer heat, especially if a not too dark color tone is chosen for the clinker facade. You have already mentioned the shading of the mostly quite large windows.

Best regards

We have the same wall structure, additionally insulating the 60mm installation level inside with mineral wool. We have no problems with heat in the house. During long, strong heat periods, every system eventually fails anyway if the heat can no longer be sufficiently dissipated (e.g., at night). Although we have a DWD on the outside, today I would work with a soft fiber based on intuition.