Hi. We are about to buy a house built in 71.
I have some questions about how houses were built back then.
I have found non-load-bearing walls in the basement made of blåbetong, while load-bearing walls seem to be made of concrete blocks.
On the upper floor, there is wood in the walls and façade brick.
My question is whether there might be blåbetong inside the brick on the upper floor?
Like as insulation or something?
Regards.
I have some questions about how houses were built back then.
I have found non-load-bearing walls in the basement made of blåbetong, while load-bearing walls seem to be made of concrete blocks.
On the upper floor, there is wood in the walls and façade brick.
My question is whether there might be blåbetong inside the brick on the upper floor?
Like as insulation or something?
Regards.
Has any radon measurement been done? Values?
The usual practice was to build the outer basement walls in insulated blue concrete or gray lightweight concrete and then build the inner walls with concrete blocks. Would you be lucky enough to have only a non-load-bearing inner wall made of blue concrete?
Brick facades are common on houses with wood frames and mineral wool insulation.
The usual practice was to build the outer basement walls in insulated blue concrete or gray lightweight concrete and then build the inner walls with concrete blocks. Would you be lucky enough to have only a non-load-bearing inner wall made of blue concrete?
Brick facades are common on houses with wood frames and mineral wool insulation.
Ok. Thanks for the reply.
The exterior walls seem to be made of concrete hollow blocks according to what I can see, even the load-bearing interior walls appear to be the same. Do you mean there might be blåbetong outside the "gråsuggorna" in the basement walls?
Radon measurement was done last winter.
460 in the basement and 200 on the ground floor.
The exterior walls seem to be made of concrete hollow blocks according to what I can see, even the load-bearing interior walls appear to be the same. Do you mean there might be blåbetong outside the "gråsuggorna" in the basement walls?
Radon measurement was done last winter.
460 in the basement and 200 on the ground floor.
No. You probably only have concrete hollow blocks in the outer wall in the basement.
At that time, it was considered to insulate well.
Upstairs, you probably have a wooden frame construction and insulation inside the facing brick.
Is the house located on a gravel ridge?
If so, the radon might be coming from the ground.
//AA
At that time, it was considered to insulate well.
Upstairs, you probably have a wooden frame construction and insulation inside the facing brick.
Is the house located on a gravel ridge?
If so, the radon might be coming from the ground.
//AA
Thank you for your response.
I don't know if it could be ground radon, the question is how much radon three interior walls in the basement can produce? It might be unreasonable for all the radon to come from them?
What I'm most puzzled about is how the values can be as high as 200 on the ground floor, without blue concrete. In that case, the gas must be coming from the basement and rising to the ground floor.
There are mechanical exhaust and supply air vents in all rooms. I think the air exchange should be reasonable?
I don't know if it could be ground radon, the question is how much radon three interior walls in the basement can produce? It might be unreasonable for all the radon to come from them?
What I'm most puzzled about is how the values can be as high as 200 on the ground floor, without blue concrete. In that case, the gas must be coming from the basement and rising to the ground floor.
There are mechanical exhaust and supply air vents in all rooms. I think the air exchange should be reasonable?
What does the terrain look like around the house? ??
I myself live on a gravel ridge.
Is the basement in good condition??
Otherwise, install a ventilated floor with exhaust.
Then the ground radon is extracted.
//AA
I myself live on a gravel ridge.
Is the basement in good condition??
Otherwise, install a ventilated floor with exhaust.
Then the ground radon is extracted.
//AA
Thinking further...
I don't think the values you have are due to "blåbetong".
Is there a radon well on the property?
Otherwise, that's probably the right way to go.
(Google radon well)
At least if the soil is gravelly/sandy.
Several people here on the ridge have them. So do I.
(I have 200 beqirell in the basement.)
//AA
I don't think the values you have are due to "blåbetong".
Is there a radon well on the property?
Otherwise, that's probably the right way to go.
(Google radon well)
At least if the soil is gravelly/sandy.
Several people here on the ridge have them. So do I.
(I have 200 beqirell in the basement.)
//AA
Ground radon can be very high but is also the easiest to minimize. An HRV system for ground radon can actually increase the intake of ground radon in the basement.M Mapet890 said:
How do you know it's actually blue concrete? Is it stated in the prospectus? Or information from the real estate agent or radon consultant?
As a reference, we bought a house from the '70s, only ground radon, 850bq
. A radon suction system is installed, and we are waiting eagerly for the results from the winter, but I'm not worried at all No. There is no radon well.
We removed a vent to the sauna in the basement and saw that the sauna is built with blåbetong.
I’m not sure if the other “soft” walls are blåbetong, just guessing.
It feels like there might be too much negative pressure in the house and then the basement air rises and dilutes the air, causing higher values upstairs.
Should I try opening the vents in the basement further? There is a strong draft from them.
I’ve heard radon extractors are very effective, what kind of substrate is under your house? What have you paid approximately for an extractor?
We removed a vent to the sauna in the basement and saw that the sauna is built with blåbetong.
I’m not sure if the other “soft” walls are blåbetong, just guessing.
It feels like there might be too much negative pressure in the house and then the basement air rises and dilutes the air, causing higher values upstairs.
Should I try opening the vents in the basement further? There is a strong draft from them.
I’ve heard radon extractors are very effective, what kind of substrate is under your house? What have you paid approximately for an extractor?
We mostly have rock directly underneath in a known radon area.M Mapet890 said:
Yes, radon suction is effective for ground radon.
All in all, 38k for 2 drill holes/suction points.
After the radon grant, we've paid 19k but you can end up even cheaper if you do it yourself...
Really only needed 1 centrally in the house but they secured it with 2 suction points. One directly underneath and one diagonally into the next space.M Mapet890 said:
105 sqm in an angle (L shape)
They also sealed the inspection hatch at the other end of the building.