Humulus said:Yes, but what is not correct is to link it to wooden houses. It is the foundational construction in conjunction with other factors (such as the nature of the soil under the building and any waterproofing construction) that determines the degree of risk for radon infiltration.
There are, for example, modern constructions where radon can be effectively safeguarded even with these foundation types.
Furthermore, there are a relatively large number of small houses built with a basement foundation. In these, it is also relatively common to have construction elements of blue lightweight concrete - where you see radon-affected houses, both "wooden houses" and "stone houses."
However, the problem increases in cases where mineral use also extends, for example, to joists.
Finally, there are some properties, primarily on the west coast, where so-called Bohus granite has been used, and these houses have a radon problem precisely because they are "stone houses."
In general, it is also easier to address houses without the presence of "construction radon." The results tend to be lower than when there is a lot of blue lightweight concrete in the building. It is also worth noting that the increase in gamma radiation that occurs in stone houses is not found in houses without stone material.[/quote]
Gamma radiation can be at least as high in a wooden house as in a stone house. I have personal experience of this. But the risk for it is naturally significantly less in a wooden house. I can mention that I have measured over 1 million Bq in ground radon leakage in a property with a wooden frame and basement. The gamma radiation was higher out on the lawn than inside a house built with the worst kind of blue concrete.
When the inland ice advanced, large layers of alum shale were stripped off, and numerous alum shale blocks, in various sizes, were mixed with stone and gravel. Wooden properties built on these soils can very well have significantly elevated radiation, combined with extremely high radon averages. When drilling through the base plate, you can feel a heavy diesel smell from the drill hole that comes from the alum shale. These conditions are quite frequent in the Falköping - Skövde area. You might be aware that there were two blue concrete manufacturers in Falköping and Skövde. (Uddagården and Durox) This means there are quite a few blue concrete properties in this area built on soil with a very high content of alum shale in the surface layers. Not easy objects to decontaminate...
When it comes to decontamination against ground radon under conditions as above, it might be safest to hire someone with experience...
whew!! I had no radon! Had a guy over who measured the whole house, no radon anywhere.. He also thought that blåbetong was a great material with a high K-value.. and as long as it's not the kind that emits radon, there's no danger. And that was not the case in my situation.
In other words, you can't equate blåbetong with radon.
In other words, you can't equate blåbetong with radon.
Yes, you can! I don't know who the guy was that was with you, but either you misunderstood what he said, or he is incompetent...
HOWEVER, there is lightweight concrete that is not blue (does not contain alum shale) and it does not emit radon.
HOWEVER, there is lightweight concrete that is not blue (does not contain alum shale) and it does not emit radon.
njitnjau said:
Sure, but all material referred to as "blåbetong" is by definition radon gas emitting. There is very little lightweight concrete from older production that is not blåbetong, and it becomes very confusing for the average person to claim that there is blåbetong that is not radon emitting!
As usual, it is only through measurement that one can be sure of their facts...
As usual, it is only through measurement that one can be sure of their facts...
somelvis said:
"Blåbetong" is an unscientific name for dark lightweight concrete that often contains alum shale. If it was manufactured before 1975, it may be radon-containing to a greater or lesser extent.Humulus said:
Now, it is the case that in many parts of the world, dark lightweight concrete is produced that does not contain radon. For example, in Poland and the Baltic states, modern non-radon-containing lightweight concrete is made that is dark in color due to the constituent rocks.
The aerated concrete in my case was clearly blue or at least blue-gray. I have other aerated concrete in the house that is more whitish or light gray. I'm completely sure that I didn't misunderstand anything. And the "dude" works, according to himself, a lot with radon measurement for, among others, the municipality and the Sundsbro consortium. Moreover, the municipality recommended him and facilitated the contact. So, he's probably not completely incompetent.
What he said was that people go completely crazy as soon as they see blåbetong, which according to him was often completely unnecessary as it often involved blåbetong that does not emit radon... He also noted that it was indeed blåbetong in my case and that the radiation was non-existent.
What he said was that people go completely crazy as soon as they see blåbetong, which according to him was often completely unnecessary as it often involved blåbetong that does not emit radon... He also noted that it was indeed blåbetong in my case and that the radiation was non-existent.
THAT was a strange conclusion... I live in Skåne, in a house from the 1920s. Like most houses from that time and in this area, the house is plastered (with a frame made of various types of brick ;-)) And we definitely have a crawlspace. (Yes, there is a small cast part under an added porch.)somelvis said:
Honestly, do you think that cast slabs were made in all houses in the past? ;-)
As I said, I find your conclusion very strange. A bit curious about how you came to this assumption, really...?
I would guess that what you have is blue lightweight concrete, manufactured by, for example, Hammenhögen on Öland. That concrete contains relatively low levels of Alum Shale. Nevertheless, it does emit Radon in levels (depending on a number of other factors) that can give rise to significant levels of Radon daughters in the residence.
The fact that he then rambles on and lets his own personal opinions color the information to the customer only further shows that he seems unprofessional or incompetent!
The fact that someone is recommended by the municipality is only because they have completed the SSM course, and it is extremely basic.
It is indisputably a false claim that there exists any Alum Shale-based blue concrete that does not emit ionizing radiation and radon gas - it is simply physically impossible.
Then it may be that the levels in your case are so low that there is nothing to address - but that is another matter.
But the easiest thing is to look at the measured values: What was the average value of the radon gas level? And what was the room average for gamma radiation?
The fact that he then rambles on and lets his own personal opinions color the information to the customer only further shows that he seems unprofessional or incompetent!
The fact that someone is recommended by the municipality is only because they have completed the SSM course, and it is extremely basic.
It is indisputably a false claim that there exists any Alum Shale-based blue concrete that does not emit ionizing radiation and radon gas - it is simply physically impossible.
Then it may be that the levels in your case are so low that there is nothing to address - but that is another matter.
But the easiest thing is to look at the measured values: What was the average value of the radon gas level? And what was the room average for gamma radiation?
njitnjau said:
I am aware that "blåbetong" is not a well-defined term!
(That's why I put it in quotes and wrote the explanation that it's confusing for ordinary people)
Here in the middle part of the country, I have never encountered the Baltic blåbetong, is it common down south?
And when did it start being manufactured?
(That's why I put it in quotes and wrote the explanation that it's confusing for ordinary people)
Here in the middle part of the country, I have never encountered the Baltic blåbetong, is it common down south?
And when did it start being manufactured?
somelvis said: