ᐅ Floor construction height: 150 mm, including KfW55 standard insulation, ventilation ducts, and underfloor heating
Created on: 7 Nov 2021 10:18
S
StephanM
Dear forum members,
Unfortunately, I couldn’t find any suitable information using the search function. If this was due to user error and there are already existing entries on this topic, I would appreciate a brief pointer.
Otherwise, I have the following question:
For our new build with KfW55 standard, the general contractor suggests a floor construction thickness of 190mm (7.5 inches). An independent architect confirmed that in the past he has planned and built floor structures with a total thickness of 150-160mm (6-6.3 inches). His calculation is as follows:
As we are limited by the maximum building height, we want to save every centimeter in the floor construction to gain more room height.
Wastewater pipes will not be routed under the floor in our plan; instead, they will be installed directly in the drywall partitions one story below or in the basement.
Can you verify or dispute the above floor thickness calculation based on your experience?
Thank you very much for a brief assessment from the knowledgeable members of this forum!
Have a nice Sunday,
Best regards,
Stephan
Unfortunately, I couldn’t find any suitable information using the search function. If this was due to user error and there are already existing entries on this topic, I would appreciate a brief pointer.
Otherwise, I have the following question:
For our new build with KfW55 standard, the general contractor suggests a floor construction thickness of 190mm (7.5 inches). An independent architect confirmed that in the past he has planned and built floor structures with a total thickness of 150-160mm (6-6.3 inches). His calculation is as follows:
- Concrete slab
- 50mm (2 inches) insulation, with recessed space for ventilation ducts (50mm / 2 inches height), supply and return pipes, fresh water, and electrical wiring
- Fill layer with perlite granulate
- 20-30mm (0.8-1.2 inches) impact sound insulation
- 20mm (0.8 inches) for underfloor heating
- 45mm (1.8 inches) screed
- 15mm (0.6 inches) floor covering
- totaling 150-160mm (6-6.3 inches)
As we are limited by the maximum building height, we want to save every centimeter in the floor construction to gain more room height.
Wastewater pipes will not be routed under the floor in our plan; instead, they will be installed directly in the drywall partitions one story below or in the basement.
Can you verify or dispute the above floor thickness calculation based on your experience?
Thank you very much for a brief assessment from the knowledgeable members of this forum!
Have a nice Sunday,
Best regards,
Stephan
StephanM schrieb:
For our new construction to KfW55 standards, the general contractor suggests a floor structure thickness of 190mm (7.5 inches). An independent architect confirmed that in the past, he has planned and built floor structures with 150-160mm (6-6.3 inches). His calculation is as follows: In any case, it’s your “calculation without the host” if you allow your second-opinion architect to interfere with the building plans of your planning and construction architect – too many cooks spoil the broth!
This obviously applies equally to the floor build-up and roof drainage.
If you have doubts about the capabilities of your construction architect, you should discuss with your builder that you want to shift the lead responsibility to the second-opinion architect. But do they have an established way of working together?
Regarding the difference between 270 and 266 cm (106 and 104.7 inches) clear ceiling height, I wouldn’t worry about it; that’s negligible. You will never notice on your sofa if you sit 4 cm (1.6 inches) lower relative to sea level – it doesn’t cause any relevant air pressure difference, not even for people with heart or lung conditions.
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