ᐅ How to determine the U-value of an exterior wall?

Hello house experts,

maybe someone here can help me, as I am having trouble with online calculators for determining U-values (demo versions with very limited material options). I want to at least roughly determine the U-value of my exterior walls. Perhaps someone of you can provide more accurate wall values?

1. Poroton hollow clay bricks, 30 cm (12 inches) thick, with exterior and interior plaster each 1 cm (0.4 inches) thick (built in 1989)
2. Poroton hollow clay bricks, 24 cm (9.5 inches) thick, with exterior plaster 1 cm (0.4 inches) thick, exterior insulation made of polystyrene (EPS) 6 cm (2.4 inches) thick, and interior plaster 1 cm (0.4 inches) thick (built in 1989)
3. Concrete hollow block (gray blocks with hollow chambers, coarse porous), 24 cm (9.5 inches) thick, with exterior and interior plaster each 1 cm (0.4 inches) thick (built in 1989)
4. Wall (total thickness 26 cm (10 inches)) in timber frame construction with interior gypsum board (exact inner structure unknown) and exterior plaster 1 cm (0.4 inches) thick (built in 1999)
5. Wall (total thickness 32 cm (12.6 inches)) in timber frame construction with interior gypsum board (exact inner structure unknown), exterior polystyrene (EPS) insulation 6 cm (2.4 inches) thick, and exterior plaster 1 cm (0.4 inches) thick (built in 1999)

Thank you very much!

Fragehiersel schrieb:

Maybe someone here can help me, as I am stuck with online calculators for determining the U-value (demo versions have very limited material options). I want to at least roughly determine the U-value of my house’s exterior walls. Maybe one of you could help me get more accurate wall values?

You can easily do this yourself. The demo version is completely sufficient.
And if you already consider the forum members your helpers, please provide enough information. How should someone determine a value for points 4/5 if you don’t even say how the wall is constructed? So please open up the wall and provide exact data. Also regarding the polystyrene insulation—what exact insulation was installed? Etc.
Regarding point 1, the value will be slightly below 0.50 (not better than 0.45), depending on the specific masonry. It took about 40 seconds using the demo version of ubakus and a quick search on Google.

What should I enter in ubakus for 3.)? Many construction materials are not unlocked in the demo version.

Choose something. I don’t know which type of block was used. You can work out a range with "from" and "to". I would just assume 1,000kg (2,205 lbs).

Fragehiersel schrieb:

I would like to roughly calculate the U-value of my exterior walls. Maybe someone here can help me determine the exact wall properties?
1. Poroton large-pored brick, 30 cm (12 inches) thick, with 1 cm (0.4 inches) of plaster on both outside and inside (built in 1989)
2. Poroton large-pored brick, 24 cm (9.5 inches) thick, with 1 cm (0.4 inches) outside plaster, 6 cm (2.4 inches) exterior EPS insulation, and 1 cm (0.4 inches) inside plaster (built in 1989)
3. Concrete hollow block (gray blocks with hollow chambers, coarse porous), 24 cm (9.5 inches) thick, with 1 cm (0.4 inches) plaster on both outside and inside (built in 1989)
4. Wall (26 cm (10 inches) total thickness) timber frame construction with interior drywall (exact internal structure unknown) and 1 cm (0.4 inches) exterior plaster (built in 1999)
5. Wall (32 cm (13 inches) total thickness) timber frame construction with interior drywall (exact internal structure unknown), 6 cm (2.4 inches) exterior EPS insulation, and 1 cm (0.4 inches) exterior plaster (built in 1999)

Good gracious, who builds a house with such a mixed jumble (a mixed salad of leftover building materials?), and then continues "in the same proven fashion" ten years later when adding an extension?

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