ᐅ Black engobed roof tiles / Faster intense heating / Upper floor?

Hello,

we went out over the weekend to choose roof tiles, and we like a roof tile from Creaton (type Balance) in the color Nuance black engobed. However, I’m not sure if the tile is only engobed or also glazed, as it has a refined silky sheen in the engobe coating.

But what about heat in the summer? Does this type of tile transfer heat to the insulation faster than, for example, a red tile? A sunny weekend doesn’t really matter, but it becomes more interesting during a longer heatwave. If the heat penetration is only delayed by about one day with a red tile, then it probably doesn’t make much difference either.

Our upper floor construction from inside to outside is as follows: 12.5 mm (1/2 inch) drywall, 15 mm (5/8 inch) OSB, 240 mm (9.5 inches) 035 glass wool insulation between the rafters. On top of that is DeltaMaxx foil (or something similar) and then the roof covering.

Best regards

Hello,

Philiboy83 schrieb:

We went out over the weekend to choose roof tiles. We like a roof tile from the company Creaton (type Balance) in the color Nuance black engobe, although I’m not sure whether the tile is only engobed or also glazed, since it has a refined silk gloss in the engobe.

Before you start worrying about the thermal properties, you should first check the written regulations in the development plan to see if engobed roof tiles are even permitted. They are not allowed everywhere!

Best regards, Bauexperte

Yes, we are allowed to install them there. I already thoroughly reviewed the development plan before purchasing the plot.

Hello,

Philiboy83 schrieb:
...But what about the issue of heat in summer? Does it get transferred into the insulation faster with this type of tile compared to, for example, a red tile?

Naturally, because the absorption rate here is almost 90%. With an exposed orientation, surface temperatures can reach 80..90°C (176..194°F)! Additionally, the insulation, which is beneficial during heating periods, offers little help in cooling loads.

Best regards

€uro schrieb:
Additionally, insulation, which is helpful for heating operation, offers little benefit in cooling situations!

Best regards.

Hello!

I can only agree with €uro. Insulation only delays the heating up by a maximum of 3 days initially – after those 3 days, it then acts as a heat storage, slowing down the cooling process.

That’s why this time we built with an uninsulated and unoccupied tent roof .

However, I don’t understand why in a gable roof the tiles are not effectively ventilated from behind so that heat can be quickly dissipated.

Best regards,
TomTom1

Hello Philiboy83,

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

What matters more is, firstly, a ventilated roof, as Tom Tom 1 mentioned, and secondly, proper insulation. Glass wool has a low thermal mass, which means it transfers heat relatively quickly. Cellulose and/or soft fiber boards have a significantly better thermal mass. This means that the living space behind the insulation heats up more slowly. This is what is meant by summer heat protection.

If something counteracts cooling, there is a simple solution: ventilation! Here in Konstanz, it is a huge loss when an unoccupied attic space is left unused.

Best regards,

K.Brodbeck