Offer · Construction
Timber-frame wall, roof and floor build-ups. Every layer counted.
Three walls, two roofs and two floors our houses are made of. Each has a hygrothermal report: U-value, phase shift, the temperature in every layer and a condensation check. Look at the layers, compare the numbers, download the sheet.
Build-ups
Layer by layer
Pick the element and the version. The layers open up in 3D, and one button shows them the way the report draws them: to scale, with the studs at their spacing and the dimensions. The numbers come from Ubakus reports for winter: −5 °C outside, 20 °C inside. Hover a layer to see its thickness and its place in the temperature profile.
Layers
- 01Plasterboard 12.5 mm
- 02Service cavity with STEICOflex 036 40 mm
- 03OSB/3 board 15 mm
- 04STEICOzell 170 mm, blown-in wood fibre05Södra C24 studs 45 × 170 mm at 60 cm
- 06STEICOprotect M dry 120 mm
- 07Adhesive with mesh and render
Winter
Where the heat stays
The temperature profile through the element at −5 °C outside and 20 °C in the room. The width of the bands is the thickness of the layers, the drop of the line their thermal resistance: the steeper, the more the layer insulates.
Calculated as in the reports: surface resistances 0.25 inside and 0.04 outside (DIN 4108-3), along the insulation between the members. None of the seven build-ups condenses.
Summer
The heat arrives in the morning
The phase shift says how many hours the outside temperature peak takes to reach the inner surface, the amplitude damping how many times weaker it gets. A day of 18 °C at night and 34 °C at 3 pm, a steady 24 °C inside:
A simplified model: a daily sine wave and a constant room temperature, damping and shift from the reports. A roof surface gets hotter than the air, so the differences in an attic are larger, but the proportions between the versions stay the same.
Why this way
No polystyrene, no foam, no guessing
- 01
Diffusion-open
Premium and Comfort have no foil. The OSB board inside slows the water vapour down and the wood-fibre board outside lets it out: the diffusion resistance s_d of the whole wall is 3.3 m, in Standard with its membrane 10.2 m. Moisture that gets into the element has a way out.
- 02
Checked for condensation
Each of the seven build-ups went through an Ubakus 2D-FE calculation: 90 days at −5 °C and 80 % humidity outside, 20 °C and 50 % inside. None of them condenses, and the inner wall surface stays at 19 °C, no conditions for mould.
- 03
No polystyrene, no foam
The insulation is blown-in STEICOzell wood fibre, which fills every gap between the studs and does not settle, plus wood-fibre boards outside. We use neither polystyrene nor sprayed PUR foam: the element stays open and can one day be taken apart.
- 04
Mass that works in summer
55 kg per square metre of the Premium wall and the high heat capacity of wood fibre give an 18-hour phase shift. The peak of the heat reaches the inside in the early morning, 94 times weaker, when it is easiest to air out.
Downloads
Build-up sheets
A four-page report for every build-up: layers with λ and R, the temperature profile with the dew point, relative humidity inside the element and the diffusion resistance. In Polish, straight from the program.
- External wallPremiumU 0.119 · 361 mmPDF, 86 KB
- External wallComfortU 0.135 · 321 mmPDF, 88 KB
- External wallStandardU 0.148 · 317 mmPDF, 80 KB
- RoofRafter 24 cmU 0.132 · 353 mmPDF, 101 KB
- RoofRafter 20 cmU 0.150 · 313 mmPDF, 101 KB
- FloorSTEICOjoist 400U 0.101 · 480 mmPDF, 71 KB
- FloorSTEICOjoist 300U 0.132 · 380 mmPDF, 77 KB
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