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with a few changes the adroid app could be quite usefull. 50 materials in the list is just way too limiting. If I'm really list the materials used in the wall or roof, tell me what the thermal conductivity is, let me enter the thickness. Then the app calculates the resulting u-value and adds it all together.
check out this website for inspiration:-)
Your calculator ignores the SI units versus SAE units. If someone types in the R-value from the US, which is typically SAE units, they get the wrong answer in U-value. You should fix this and/or have a toggle for people to convert. Here's the values from Wiki: The conversion between SI and US units of R-value is 1 h•ft²•°F/Btu = 0.176110 K•m²/W, or 1 K•m²/W = 5.678263 h•ft²•°F/Btu
Have a nice day,
1-How can find density of foam rigid insulation for R- Value, what is the equation between R- Value and density?
2-How can find R-Value?
If passable send me calculation.