R-value (insulation) typical straw bale houses have very thick walls and thus are well insulated. Snow is roughly R-1 per inch. Brick has a very poor insulating ability at a mere R-0.2 per inch; however it does have a relatively good thermal mass. Note that the above examples all use the U.S. (non-SI) definition for R-value. When determining the overall thermal resistance of a building assembly such as a wall or roof, the insulating effect of the surface air film is added to the thermal resistance of the other materials. In practice the above surface values are used for floors, ceilings, and
Mineral industry of Seychelles Mineral industry of Seychelles The mineral industry of Seychelles consists mostly of production of such materials as clay, coral, sand, and stone. Seychelles is not a globally significant mineral producer or consumer. In 2006, imports of mineral fuels accounted for about 27% of the value of total imports. That same year, Seychelles was estimated to produce about 210,000 metric tons per year (t/yr) of gravel and crushed stone, 93,000 t/yr of granite, and 8,100 t/yr of sand. The main commercial producers of these construction materials are Civil Construction Company Ltd., Gondwana Granite, and United Concrete Products (Seychelles) Ltd.; which are