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Nordlichtchen24 Apr 2013 10:35Hi everyone,
The topic of thermal insulation is always widely discussed... but what about protection against heat? We feel a bit, well, let's say unsure about that.
We are building a timber frame house with the following layers from inside to outside:
- Gypsum board, 12mm (0.5 inch) OSB, a 4x6 (approximately 10x15 cm, 4x6 inches) batten structure for installation space, 18mm (0.7 inch) OSB, vapor retarder layer,
6x20 cm (2.4x8 inch) structural timber frame filled with glass wool Thermolan Unifit 035, 200mm (8 inches), 16mm (0.6 inch) wood-based insulating board (or alternatively a wood fiberboard),
weather barrier membrane, air gap, 11.5 cm (4.5 inches) thick facing brickwork.
In the roof area, there is 240mm (9.5 inches) of glass wool (Thermolan Unifit 035) between the rafters, with black clay roof tiles.
We understand that mineral wool is not intended for summer heat protection. Our idea was to remove the 16mm (0.6 inch) wood-based insulating board on the outside and replace it with a 32mm (1.3 inch) wood fiberboard.
But before changing the plans, how effective is heat protection in a house like this with glass wool insulation and a brick veneer? Could the heat protection already be good enough so that we’re just worrying unnecessarily?
Of course, we’ve experienced extreme stuffy heat during summer in our 20-year-old top-floor apartment and definitely want to avoid that in the new build.
We are managing solar heat gain through windows with blinds and similar measures, and the new triple-glazed windows will have a U-value of 0.5, including 5-star Velux windows that provide good solar heat protection.
The house doesn’t have to be a refrigerator in summer, but it should be comfortable to live in without sweaty nights, waking up with headaches, or worrying whether the child is too warm in bed.
The topic of thermal insulation is always widely discussed... but what about protection against heat? We feel a bit, well, let's say unsure about that.
We are building a timber frame house with the following layers from inside to outside:
- Gypsum board, 12mm (0.5 inch) OSB, a 4x6 (approximately 10x15 cm, 4x6 inches) batten structure for installation space, 18mm (0.7 inch) OSB, vapor retarder layer,
6x20 cm (2.4x8 inch) structural timber frame filled with glass wool Thermolan Unifit 035, 200mm (8 inches), 16mm (0.6 inch) wood-based insulating board (or alternatively a wood fiberboard),
weather barrier membrane, air gap, 11.5 cm (4.5 inches) thick facing brickwork.
In the roof area, there is 240mm (9.5 inches) of glass wool (Thermolan Unifit 035) between the rafters, with black clay roof tiles.
We understand that mineral wool is not intended for summer heat protection. Our idea was to remove the 16mm (0.6 inch) wood-based insulating board on the outside and replace it with a 32mm (1.3 inch) wood fiberboard.
But before changing the plans, how effective is heat protection in a house like this with glass wool insulation and a brick veneer? Could the heat protection already be good enough so that we’re just worrying unnecessarily?
Of course, we’ve experienced extreme stuffy heat during summer in our 20-year-old top-floor apartment and definitely want to avoid that in the new build.
We are managing solar heat gain through windows with blinds and similar measures, and the new triple-glazed windows will have a U-value of 0.5, including 5-star Velux windows that provide good solar heat protection.
The house doesn’t have to be a refrigerator in summer, but it should be comfortable to live in without sweaty nights, waking up with headaches, or worrying whether the child is too warm in bed.
N
Nordlichtchen24 Apr 2013 10:55Before any misunderstandings arise, we are aware that with insulation materials, the important factor is their thermal capacity—that is, the high heat storage ability, which delays heat transfer over time and smooths out temperature peaks.
I
Irgendwoabaier24 Apr 2013 19:26Hello,
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 finish instead of facing brickwork). The second reason is soundproofing.
Regards,
I.
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 finish instead of facing brickwork). The second reason is soundproofing.
Regards,
I.
blockhauspower26 Apr 2013 08:34Hello,
With the outer masonry layer, which I assume is solid brick or facing brick, you have already chosen a material with high thermal mass. Since this is the exterior layer, it heats up the most on the south side, quite strongly on the west side, and less on the east and north sides. This heat is retained overnight and released slowly, preventing heat peaks and large temperature fluctuations inside, while also avoiding rapid cooling. If, unexpectedly, there is a very long and hot summer again, the house’s façade will warm up considerably and release the heat gradually, unlike “insulation-only” houses that cannot store heat.
I consider your wall design suitable for providing protection against summer heat, especially if the facing brick façade is in a not too dark color. You have already mentioned shading the usually quite large windows.
Best regards
With the outer masonry layer, which I assume is solid brick or facing brick, you have already chosen a material with high thermal mass. Since this is the exterior layer, it heats up the most on the south side, quite strongly on the west side, and less on the east and north sides. This heat is retained overnight and released slowly, preventing heat peaks and large temperature fluctuations inside, while also avoiding rapid cooling. If, unexpectedly, there is a very long and hot summer again, the house’s façade will warm up considerably and release the heat gradually, unlike “insulation-only” houses that cannot store heat.
I consider your wall design suitable for providing protection against summer heat, especially if the facing brick façade is in a not too dark color. You have already mentioned shading the usually quite large windows.
Best regards
P
Philiboy8329 Apr 2013 17:09We have the same wall structure, with an additional 60mm (2.4 inches) insulation layer of mineral wool on the interior installation level.
We do not have any issues with heat inside the house. During prolonged periods of intense heat, any system will eventually struggle if the heat cannot be sufficiently released, for example, at night.
Although we have an external DWD (ventilated facade), based on experience, I would choose a soft fiber insulation today.
We do not have any issues with heat inside the house. During prolonged periods of intense heat, any system will eventually struggle if the heat cannot be sufficiently released, for example, at night.
Although we have an external DWD (ventilated facade), based on experience, I would choose a soft fiber insulation today.
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