ᐅ Properly insulated floor with underfloor heating (15–16 cm build-up height)
Created on: 20 Dec 2016 20:24
1
19Chris84
Hey everyone
First of all, I have to say this is a really great forum. I’ve been reading for a while, but now I have a question myself.
How would you build a properly insulated floor structure with underfloor heating? The total build-up height including the floor covering is 16cm (6.3 inches).
It’s about a ground floor over an unheated basement.
I originally thought there were 18cm (7 inches) planned for the floor build-up on the ground floor, but in the heat of the moment, I overlooked that the architect planned only 15cm (6 inches).
What can I say? The windows and doors are installed, some of them floor-to-ceiling. That means I have to make do with 16cm (6.3 inches) measured on site.
Are there any possibilities to optimize this? The screed has to be at least 65mm (2.6 inches) thick (20mm (0.8 inches) underfloor heating pipes + 45mm (1.8 inches) screed cover).
In an extreme case, if necessary, could insulating the basement ceiling from underneath be an option? Would that make sense?
I hope you can help me out here.
Best regards,
Chris
First of all, I have to say this is a really great forum. I’ve been reading for a while, but now I have a question myself.
How would you build a properly insulated floor structure with underfloor heating? The total build-up height including the floor covering is 16cm (6.3 inches).
It’s about a ground floor over an unheated basement.
I originally thought there were 18cm (7 inches) planned for the floor build-up on the ground floor, but in the heat of the moment, I overlooked that the architect planned only 15cm (6 inches).
What can I say? The windows and doors are installed, some of them floor-to-ceiling. That means I have to make do with 16cm (6.3 inches) measured on site.
Are there any possibilities to optimize this? The screed has to be at least 65mm (2.6 inches) thick (20mm (0.8 inches) underfloor heating pipes + 45mm (1.8 inches) screed cover).
In an extreme case, if necessary, could insulating the basement ceiling from underneath be an option? Would that make sense?
I hope you can help me out here.
Best regards,
Chris
Hello,
usually, 8-10 cm (3-4 inches) of insulation with a thermal conductivity of 0.035 W/(m·K) is installed beneath the underfloor heating. If you choose a better insulation material (0.025 W/(m·K) or lower), you can achieve suitable insulation even with a thinner floor construction, without needing to insulate the basement ceiling (which, when done properly, also affects the upper part of the basement wall).
Good luck!
Best regards,
Ellie
usually, 8-10 cm (3-4 inches) of insulation with a thermal conductivity of 0.035 W/(m·K) is installed beneath the underfloor heating. If you choose a better insulation material (0.025 W/(m·K) or lower), you can achieve suitable insulation even with a thinner floor construction, without needing to insulate the basement ceiling (which, when done properly, also affects the upper part of the basement wall).
Good luck!
Best regards,
Ellie
You can work it out backwards.
15 cm (6 inches) - 1.5 cm (0.6 inches) floor covering - 6.5 cm (2.6 inches) screed including underfloor heating leaves 7 cm (2.8 inches) insulation.
If this was planned this way from the start and you just didn’t notice it, it should still be suitable and work for the energy performance certificate.
In our case, the build-up is 19 cm (7.5 inches), the same in the basement, ground floor, and upper floor: 8 cm (3.1 inches) insulation with thermal conductivity class 035, then 3 cm (1.2 inches) carrier plate for underfloor heating including impact sound insulation, followed by 6.5 cm (2.6 inches) screed, and finally 1.5 cm (0.6 inches) floor covering.
15 cm (6 inches) - 1.5 cm (0.6 inches) floor covering - 6.5 cm (2.6 inches) screed including underfloor heating leaves 7 cm (2.8 inches) insulation.
If this was planned this way from the start and you just didn’t notice it, it should still be suitable and work for the energy performance certificate.
In our case, the build-up is 19 cm (7.5 inches), the same in the basement, ground floor, and upper floor: 8 cm (3.1 inches) insulation with thermal conductivity class 035, then 3 cm (1.2 inches) carrier plate for underfloor heating including impact sound insulation, followed by 6.5 cm (2.6 inches) screed, and finally 1.5 cm (0.6 inches) floor covering.
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