ᐅ Black engobed roof tiles / Faster intense heating / Upper floor?
Created on: 13 May 2013 09:25
P
Philiboy83
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
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
B
Bauqualle12 Jun 2013 10:39Philiboy83 schrieb:
But what about the issue of heat in summer? .. then please create a long-term table showing when it is actually extremely hot in Germany and when we have mild and cold days here in Germany ...K.Brodbeck schrieb:
Hello Philiboy83,
I also think that the color of the brick is of secondary importance.
Mineral wool insulation has low thermal mass, which means it transfers heat relatively quickly. Cellulose and/or soft fiber boards have significantly higher thermal mass. This means the living space behind them heats up more slowly. This is what is meant by summer thermal protection.
If something hinders cooling down, there is a simple solution: ventilation! Here in Konstanz, a lot of potential heat loss is wasted in an unoccupied attic space.
Best regards,
K.BrodbeckHello!
Interesting connection – but probably incorrect. Thermal mass is a matter of mass. A lot of mass stores a lot of heat – it’s a different matter when it comes to heat transfer. Try holding a (high-mass) metal rod in a campfire.
Vacuum insulation panels tend not to conduct heat, but they also do not store it.
Regarding ventilation: The old apartment was right next to Highway 1 – and open acoustic windows don’t really help.
Best regards,
TomTom1
K
K.Brodbeck12 Jun 2013 20:50TomTom1 schrieb:
Hello!
Interesting connection – but it’s probably not correct. Heat storage depends on mass. A lot of mass stores a lot of heat, but heat transfer works differently. Try holding a (heavy) metal rod in a campfire .
Tomtom.However, some experts see this differently! Do some research if you’re interested in the topic. Look up summer heat protection.
TomTom1 schrieb:
Hello!
And vacuum insulation panels tend not to conduct heat, but they also don’t store it.
Best regards,
Tomtom.Vacuum doesn’t have any mass either, right? I wouldn’t recommend it to anyone anyway.
TomTom1 schrieb:
Hello!
And regarding ventilation: The old apartment was right next to motorway 1 – and open soundproof windows don’t really help .
Best regards,
Tomtom.Ventilation doesn’t mean keeping the windows open all the time, but rather targeted shock ventilation. During hot periods, this is usually possible at night or early in the morning. I grew up about 100m (330 feet) as the crow flies from a four-lane motorway back then. We were still able to ventilate
B
Bauqualle12 Jun 2013 21:09K.Brodbeck schrieb:
Some experts see this differently! .. then they are not experts and have no clue ..K.Brodbeck schrieb:
Glass wool has a low thermal storage capacity, meaning it transfers heat relatively quickly. Cellulose and/or soft fiber boards have a significantly better thermal storage capacity. This means the living space behind them heats up later. .. wrong .... you should talk to a building physicistB
Bauexperte12 Jun 2013 22:16Hello,
Bauqualle schrieb:No, you are wrong ...
.. then they are not professionals and have no clue .... wrong .... you should talk to a building physicist
| Thermal insulation effect: | XXXX0 | Summer heat protection: | 00000 | Water vapor permeability: | high |
About the physics, in case you're interested:
With materials that have good insulation properties but low heat capacity, the following happens, for example, with solar radiation or significant one-sided heat gain: They become very, very hot (low heat capacity – temperature rises greatly for the same amount of energy). If a low density is added to this (see Bauexperte’s post), the effect is even more pronounced. The amount of energy (important!) transferred through a layer depends not only on thermal conductivity but especially on the temperature gradient between the two sides of the layer. Therefore, with many good insulating materials that have low density and low thermal conductivity, the sun-exposed layer quickly reaches high temperatures (try touching an insulated facade in summer... or better, hold your hand close to it...) – result: a lot of energy is transferred, and the interior also heats up quickly.
A material with high heat capacity not only stores heat energy but also heats up much less. This leads to a small temperature gradient, and less energy is transferred. A simple (thick, monolithic) wall can even delay the energy flow so much (>12 hours) that by the time the energy arrives inside, it is already cooler outside, and the energy flows back outside, causing only very small amounts to reach the interior (often mistakenly labeled as “energy loss” in thermal imaging, although it was free solar energy).
I imagine it’s similar with the roof: the roof tiles receive enormous amounts of energy, and material with higher heat capacity counteracts the heating, creating a much smaller temperature gradient and providing better protection against heat.
With materials that have good insulation properties but low heat capacity, the following happens, for example, with solar radiation or significant one-sided heat gain: They become very, very hot (low heat capacity – temperature rises greatly for the same amount of energy). If a low density is added to this (see Bauexperte’s post), the effect is even more pronounced. The amount of energy (important!) transferred through a layer depends not only on thermal conductivity but especially on the temperature gradient between the two sides of the layer. Therefore, with many good insulating materials that have low density and low thermal conductivity, the sun-exposed layer quickly reaches high temperatures (try touching an insulated facade in summer... or better, hold your hand close to it...) – result: a lot of energy is transferred, and the interior also heats up quickly.
A material with high heat capacity not only stores heat energy but also heats up much less. This leads to a small temperature gradient, and less energy is transferred. A simple (thick, monolithic) wall can even delay the energy flow so much (>12 hours) that by the time the energy arrives inside, it is already cooler outside, and the energy flows back outside, causing only very small amounts to reach the interior (often mistakenly labeled as “energy loss” in thermal imaging, although it was free solar energy).
I imagine it’s similar with the roof: the roof tiles receive enormous amounts of energy, and material with higher heat capacity counteracts the heating, creating a much smaller temperature gradient and providing better protection against heat.
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