ᐅ Why is shading especially important in newly constructed houses?
Created on: 29 Aug 2016 13:33
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Grym
It is often argued that shading is especially important in new builds to prevent overheating in summer. But why is that exactly?
The insulation in a new building works both ways. Whether it’s cold or heat, the house takes much longer to adopt the outside temperature compared to an older house with poorer insulation.
Now, regarding the windows themselves. Shouldn’t solar energy pass through a less effective double-glazed window faster than through a modern triple-glazed window?
Why do many say that shading is PARTICULARLY important in new builds during summer? I would rather think the opposite: a new build is better insulated against heat from outside. Triple-glazed windows with a low U-value keep heat out better than old double-glazed windows.
The insulation in a new building works both ways. Whether it’s cold or heat, the house takes much longer to adopt the outside temperature compared to an older house with poorer insulation.
Now, regarding the windows themselves. Shouldn’t solar energy pass through a less effective double-glazed window faster than through a modern triple-glazed window?
Why do many say that shading is PARTICULARLY important in new builds during summer? I would rather think the opposite: a new build is better insulated against heat from outside. Triple-glazed windows with a low U-value keep heat out better than old double-glazed windows.
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daniels8730 Aug 2016 07:46When I look at my parents’ “old building”…
A different construction style… On the south side, shading is provided by the covered terraces. On the west side, shading comes from the balcony and canopy, plus shading from trees in the garden. And: the building is significantly larger (surface-to-volume ratio).
In contrast, a bare new building with large windows on the south side looks like it’s on display.
From my experience in my old apartment (a building from the 1970s): it overheats no matter what you do. If you barricade the windows, the heat still gets in through the roof and walls. If, in new construction, everything is well shaded, heat penetration is much more difficult. Therefore, shading is more important in new buildings because it makes a bigger difference.
A different construction style… On the south side, shading is provided by the covered terraces. On the west side, shading comes from the balcony and canopy, plus shading from trees in the garden. And: the building is significantly larger (surface-to-volume ratio).
In contrast, a bare new building with large windows on the south side looks like it’s on display.
From my experience in my old apartment (a building from the 1970s): it overheats no matter what you do. If you barricade the windows, the heat still gets in through the roof and walls. If, in new construction, everything is well shaded, heat penetration is much more difficult. Therefore, shading is more important in new buildings because it makes a bigger difference.
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Peanuts7430 Aug 2016 07:46Knallkörper schrieb:
Well... yes and no. We were discussing insulation, not thermal mass. Materials with a low U-value generally have low thermal mass. So that argument actually points in the opposite direction.I disagree; a sand-lime brick wall with added insulation does indeed have high thermal mass and also a high capacity to absorb heat. That was one reason why sand-lime brick was the only option for us. Other factors like strength, sound insulation, etc., only reinforced that view.
But back to the topic, every ballpoint pen lying in the room heats up and can store a small amount of energy. That’s why it’s impossible to make a 100% physically accurate assessment.
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Peanuts7430 Aug 2016 07:48daniels87 schrieb:
When I look at my parents’ "old building"...
Different construction style... On the south side, shading is provided by the terrace roofs. On the west side, shading comes from the balcony and roof overhangs, as well as from trees in the garden. And: the building is significantly larger (surface area-to-volume ratio).
In contrast, a bare new building with large south-facing windows looks like it’s on display.
From my experience living in an old apartment building from the 1970s: it gets ridiculously hot, no matter what you do. If you barricade the windows, heat still enters through the roof and walls. In a new building, if everything is well shaded, heat penetration is much less. That’s why shading is more important for new buildings, because it has a particularly strong effect.Exactly, if it is well shaded!
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Sebastian7930 Aug 2016 07:48Yes, exactly – that’s why practical experience is simply the best in this case, because no matter how you analyze it, new buildings do not stay cooler.
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Peanuts7430 Aug 2016 07:50Sebastian79 schrieb:
Yes, exactly – that’s why practical experience is simply the best here because no matter how you analyze it: new buildings do not get cooler.Actually, the attic can become noticeably cooler if it is shaded.
Try going into the top floor of a house with an uninsulated roof.
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Sebastian7930 Aug 2016 07:51No, it’s also warm here with us...
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