Now after I have redone the plumbing in the bathroom, I plan to rebuild the floor as it was before. So, floating concrete floor on foam. I haven't had any moisture problems before, so it should be fine. I had 10cm of insulation before and will add at least another 5cm.
Now I wonder if the floor needs to be reinforced in some way since the jacuzzi (large for 2 people) will be in one corner. Will it hold? Is the foam stiff enough to support the weight? I will, of course, reinforce the floor as usual and lay 7-10cm of concrete.
I've also heard that it's not good to combine waterborne underfloor heating with tiles for such a construction. But that shouldn't be a problem, right? Because I plan to have that too.
Now I wonder if the floor needs to be reinforced in some way since the jacuzzi (large for 2 people) will be in one corner. Will it hold? Is the foam stiff enough to support the weight? I will, of course, reinforce the floor as usual and lay 7-10cm of concrete.
I've also heard that it's not good to combine waterborne underfloor heating with tiles for such a construction. But that shouldn't be a problem, right? Because I plan to have that too.
I don't think you need to worry about the load-bearing capacity of the cell foam. Check the specification at http://www.dorocell.se/dorocell_system/sys_scripts/productcat.asp?ac=viewcat&catid=15
Nowadays, cell foam is used in road sections where there are enormous stresses. More densely packed and expensive cell foam, such as DC300 or higher, is used. In house foundations, cell foam DC100 is typically used.
I'll try an example calculation.
First, let's see what the slab can withstand:
DC100 can withstand a short-term load pressure before breaking of up to 100kPa and a long-term load pressure before deformation of 30kPa. 1kPa (kilopascal) is the same as 1000 newtons distributed over an area of one square meter. 1 newton ~ 10 kg here on Earth. So, a square can withstand 10 tons.
Now to the load:
1 cubic meter of water weighs 1000 kg. The concrete and bathtub together maybe weigh the same, and it's distributed over 1 square meter, let's say. That results in about 2 tons per square meter with a margin (bathers, shampoo, and duck included).
The result is that the foundation can support 9 bathtubs stacked on top of each other. You can be at ease!
PS! Double-check this with a building engineer.
/CC
Nowadays, cell foam is used in road sections where there are enormous stresses. More densely packed and expensive cell foam, such as DC300 or higher, is used. In house foundations, cell foam DC100 is typically used.
I'll try an example calculation.
First, let's see what the slab can withstand:
DC100 can withstand a short-term load pressure before breaking of up to 100kPa and a long-term load pressure before deformation of 30kPa. 1kPa (kilopascal) is the same as 1000 newtons distributed over an area of one square meter. 1 newton ~ 10 kg here on Earth. So, a square can withstand 10 tons.
Now to the load:
1 cubic meter of water weighs 1000 kg. The concrete and bathtub together maybe weigh the same, and it's distributed over 1 square meter, let's say. That results in about 2 tons per square meter with a margin (bathers, shampoo, and duck included).
The result is that the foundation can support 9 bathtubs stacked on top of each other. You can be at ease!
PS! Double-check this with a building engineer./CC
Well, I'll be damned, you always learn something here .
Thanks! Foam as foam, what difference does it make... I've always thought it was a measure of thickness, but in reality, it indicates the short-term load. But DC stands for DoroCell in this case, right?
I did a quick search online, for example, on Byggmax it says S80 and I assume that also indicates the short-term load? Which might be too small for me then.
Found a cool site that explains a lot http://www.thermisol.se/ There they recommend quality 200 or 300! But there, it's about the entire board.
This got me thinking about another thing. Those with better quality have a lower lambda value, but how do you interpret it? Normal insulation like mineral and stone wool has lambda values of about 35-40 but the foam insulation has no more than 0.03-0.04??? I've learned that the lower the lambda, the better it insulates. But it can't be that big of a difference? Should we take a factor of 1000 on the foam?
Is there a big price difference between the qualities?
.Thanks! Foam as foam, what difference does it make... I've always thought it was a measure of thickness, but in reality, it indicates the short-term load. But DC stands for DoroCell in this case, right?
I did a quick search online, for example, on Byggmax it says S80 and I assume that also indicates the short-term load? Which might be too small for me then.
Found a cool site that explains a lot http://www.thermisol.se/ There they recommend quality 200 or 300! But there, it's about the entire board.
This got me thinking about another thing. Those with better quality have a lower lambda value, but how do you interpret it? Normal insulation like mineral and stone wool has lambda values of about 35-40 but the foam insulation has no more than 0.03-0.04??? I've learned that the lower the lambda, the better it insulates. But it can't be that big of a difference? Should we take a factor of 1000 on the foam?
Is there a big price difference between the qualities?
Not that it's relevant anymore perhaps, but I still have to comment if anyone else sees this,,
First, let's check what the slab can withstand:
DC100 can withstand a pressure with a short-term load before failure of up to 100kPa and a long-term load before deformation of 30kPa. 1kPa (kilopascal) is the same as 1000 newtons distributed over a square meter surface. 1 newton ~ 10 kg here on Earth. A square can thus withstand 10 tons.
1 newton is not equal to 10 kg, it is equal to 0.1 kg
1 kg is therefore equal to 10 N.
1pa = 1N/m2
10pa = 1kg/m2
10kpa = 1000 kg/m2
If it withstands a load of 30kpa, it is thus equal to 3000kg/m2 and not 10,000kg/m2.
If your bathtub has fallen into the basement, now you know why
First, let's check what the slab can withstand:
DC100 can withstand a pressure with a short-term load before failure of up to 100kPa and a long-term load before deformation of 30kPa. 1kPa (kilopascal) is the same as 1000 newtons distributed over a square meter surface. 1 newton ~ 10 kg here on Earth. A square can thus withstand 10 tons.
1 newton is not equal to 10 kg, it is equal to 0.1 kg
1 kg is therefore equal to 10 N.
1pa = 1N/m2
10pa = 1kg/m2
10kpa = 1000 kg/m2
If it withstands a load of 30kpa, it is thus equal to 3000kg/m2 and not 10,000kg/m2.
If your bathtub has fallen into the basement, now you know why
