Autoclaved aerated concrete block (AAC)
R-value (US) = RSI × 5.678263337 and RSI (SI) = R-value × 0.1761101838 and R = 1/U
0.25 W/mK = R value US of 5.678 X 1/0.25 = 5.678 X 4 = 22.7 R value for wall.
Some places list AAC has an "effective" R value of up to 3.9 but my figures indicate a real R value of approximately 1.25 per inch depending on density. Effective R value use the mass of the concrete to store heat for higher effective R under certain conditions.
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