Black engobed roof tiles / Faster strong heating / Upstairs?

But what about the topic of heat in summer?

.. then please create a long-term table showing when it is really extremely hot in Germany and when we have moderate and cold days here in Germany ...

Hello Philiboy83,

I also think that the color of the tile is of secondary importance.

The glass wool has a low heat storage capacity, which means it conducts heat relatively quickly. Cellulose and/or soft fiber boards have a significantly better heat storage capacity. This means that the living space behind only heats up later. This is what is meant by summer thermal protection.

If something opposes cooling, there is a simple solution: ventilate! Here in Konstanz, it is a fortune that is wasted with an uninhabited attic space.

Regards

K.Brodbeck

Morning!

Interesting connection - but it is probably wrong. Heat storage is a matter of mass. A lot of mass stores a lot of heat - with conduction, it is different. Hold a (massive) metal rod in a campfire.

And vacuum insulation panels tend not to conduct heat, but they also don’t store it.

And regarding ventilation: The old apartment was right by the Autobahn 1 - and open soundproof windows don’t really help.

Regards,
Tomtom.

Hi!

Interesting connection - but it is probably wrong. Heat storage is a matter of mass. A lot of mass stores a lot of heat - it's different with heat conduction. Hold a (massive) metal rod in a campfire once .
Tomtom.

But some experts see it differently! Educate yourself if you are interested in the topic. Keyword summer heat protection.

Hi!
And vacuum insulation panels tend not to conduct heat, but they also don’t store any.
Best regards,
Tomtom.

Vacuum also has no mass, right? I wouldn’t recommend it to anyone anyway.


U

Hi!
And as for airing: the old apartment was right by the highway 1 - and open soundproof windows don’t really help .

Best regards,
Tomtom.

Airing does not mean keeping the windows open all the time, but ventilating briefly and purposefully. During hot periods this is usually possible at night or early in the morning. I grew up about 100m as the crow flies from a then 4-lane highway. We were still able to air out

Some experts see it differently!

.. then they are not experts and have no idea ..

Glass wool has a low heat storage capacity, which means it conducts heat relatively quickly. Cellulose and/or soft fiber boards have a significantly better heat storage capacity. This means that the living space behind heats up later.

.. wrong .... you should talk to a building physicist

Hello,

.. then they are not experts and have no clue .... wrong .... you should talk to a building physicist

No, you are wrong ...


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[TD="colspan: 2"]Design value of thermal conductivity λ ≈ 0.04 W/mK

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[TR="class: desc"]
[TD="colspan: 2"]Heat storage capacity S ≈ 16 kJ/cbmK

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[TD="colspan: 2"]Water vapor diffusion resistance number μ ≈ 1 - 2

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[TR="class: desc"]
[TD="colspan: 2"]Thermal capacity: 830 J/kgK

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[TD="colspan: 2"]Bulk density: 20 kg/cbm


Mineral Wool

Glass wool and stone wool are among the cheapest insulating materials available and are therefore widespread. However, the good insulation effect contrasts with a much less effective summer heat protection. And this is obviously so poor that hardly any manufacturer dares to present the corresponding facts on their website.

Decisive for summer heat protection is the heat storage capacity, i.e., the storage capacity per cubic meter of insulating material. This value is the product of the well-known heat capacity and the density of the material. The latter varies from product to product; the exact value is often only learned by direct inquiry. A random measurement on a package with 50mm thick glass wool mats (WLG040) revealed a density of only 15 kg/m3!

Mineral wool is also sensitive to moisture. Even a slight moisture ingress significantly reduces the insulating effect. If mineral wool becomes so wet that the fibers stick together, probably only a replacement of the insulation helps.

Since mineral wool cannot store or transport moisture, it is unsuitable for insulating a timber-framed house. Here, insulating materials made from natural materials are recommended, primarily wood fiber insulation boards. Meanwhile, the approved insulating materials no longer contain lung-hazardous fibers. Nevertheless, irritating dust arises during processing, against which it is better to protect yourself with a fine dust mask.

Delivery forms: Insulation mats as boards and rolls as well as loose wool.

Source: Ecological Building Material Information System of the Bavarian Chamber of Architects


Not every user here on the forum is "just" a builder



Rhenish regards

Thermal insulation effect:	XXXX0
Summer heat protection:	00000
Water vapor permeability:	high

Regarding physics, in case you're interested:
With materials that insulate well but have no heat capacity, the following simply happens with, for example, sunlight/large unilateral heat gain: they become very, very hot (low heat capacity - heating per energy is very high). If a low specific weight is added (see Epis post), this worsens even further. The amount of energy (important!) transported through a layer depends not only on the thermal conductivity but especially on the temperature gradient between the two sides of the layer! Thus, with many good insulating materials that have low density and low thermal conductivity, the sun-exposed layer quickly reaches high temperatures (touch an insulated facade in summer... or better, hold your hand in front of it.....) - consequence: a lot of energy is transported and the interior also heats up quickly.
A material with high heat capacity not only stores thermal energy but also heats up much, much less. As a result, the temperature gradient is small, and little energy is transported. A simple (thick, monolithic) wall can even delay the energy flow so much (>12 hours) that it is already colder outside again, the energy flows back, and only very small portions reach the interior of the house (often mistakenly labeled as "energy loss" in thermal images, although it was free solar energy).
I imagine it similarly for the roof: the roof tiles receive an enormous amount of energy, and material with higher heat capacity counteracts the heating, creates a much smaller temperature gradient, and thus provides better protection against the heat.