ᐅ Questions About Planned Floor Insulation and Construction (EPS Insulation)
Created on: 18 Feb 2014 12:23
E
eaerendilE
eaerendil18 Feb 2014 12:23Hello,
we have a few questions regarding our planned floor construction.
Briefly:
Everywhere we will be laying tiles, there will be corresponding EPS insulation with a cement screed. In the other rooms, solid wood floorboards are planned. The boards are 20 mm (0.8 inches) thick. We need to match the height of the rest of the floor, which means a total thickness of 150 mm (6 inches) including the floorboards.
The plan is as follows:
50 mm (2 inches) EPS insulation (150 kPa)
PE foil as a vapor barrier
50 mm (2 inches) EPS insulation (150 kPa)
5 mm (0.2 inches) impact sound insulation (mainly because 5 mm EPS boards are not available and we need the build-up height)
22 mm (0.9 inches) OSB or ESB boards to create a stable load-bearing layer
20 mm (0.8 inches) screwed floorboards
The vapor barrier was strongly recommended by our construction manager to prevent possible rising moisture from condensing on the underside of the OSB boards.
The EPS boards have a thermal conductivity of WLG 035, so we achieve the planned U-value and comply with our KfW 70 energy standard.
We do not have a basement, and the concrete slab is waterproofed with a bitumen membrane.
Is there anything seriously disadvantageous about this construction method? We are aware that numerous alternatives exist, but this approach seems to us the most sensible in terms of cost, insulation performance, and labor effort.
However, I am a bit concerned that the EPS boards might cause creaking noises. Or are the OSB boards and the floorboards sufficient to keep everything firmly in place and prevent noise?
Thank you very much in advance.
P.S. We do not have a basement. And the waterproof concrete slab is 250 mm (10 inches) thick.
we have a few questions regarding our planned floor construction.
Briefly:
Everywhere we will be laying tiles, there will be corresponding EPS insulation with a cement screed. In the other rooms, solid wood floorboards are planned. The boards are 20 mm (0.8 inches) thick. We need to match the height of the rest of the floor, which means a total thickness of 150 mm (6 inches) including the floorboards.
The plan is as follows:
50 mm (2 inches) EPS insulation (150 kPa)
PE foil as a vapor barrier
50 mm (2 inches) EPS insulation (150 kPa)
5 mm (0.2 inches) impact sound insulation (mainly because 5 mm EPS boards are not available and we need the build-up height)
22 mm (0.9 inches) OSB or ESB boards to create a stable load-bearing layer
20 mm (0.8 inches) screwed floorboards
The vapor barrier was strongly recommended by our construction manager to prevent possible rising moisture from condensing on the underside of the OSB boards.
The EPS boards have a thermal conductivity of WLG 035, so we achieve the planned U-value and comply with our KfW 70 energy standard.
We do not have a basement, and the concrete slab is waterproofed with a bitumen membrane.
Is there anything seriously disadvantageous about this construction method? We are aware that numerous alternatives exist, but this approach seems to us the most sensible in terms of cost, insulation performance, and labor effort.
However, I am a bit concerned that the EPS boards might cause creaking noises. Or are the OSB boards and the floorboards sufficient to keep everything firmly in place and prevent noise?
Thank you very much in advance.
P.S. We do not have a basement. And the waterproof concrete slab is 250 mm (10 inches) thick.
Why not simply use 8cm (3 inches) PUR insulation with a thermal conductivity of 0.023 W/mK + 6cm (2.5 inches) cement screed + floorboards?
Better U-value and a solid screed instead of flimsy OSB boards.
The price difference should be calculated, but instinctively, I would say it’s not much different.
Better U-value and a solid screed instead of flimsy OSB boards.
The price difference should be calculated, but instinctively, I would say it’s not much different.
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