The R-value, or resistance to heat flow, is the most common used measurement for determining building material's insulating properties. The greater the R-value of a material, the better it is at resisting heat loss (or heat gain). An earth block wall has very little insulative or R-value.

R-value is an assigned number derived from a specific testing procedure to determine a materials (or building assemblage) "resistance to conductive heat transfer". The higher the R-value, the more resistant a material (or building assemblage) is to conductive heat transfer. See similar questions...

R-value and U-value are reciprocal to one another. The term U-value is measured by the amount of heat that escapes a surface-a wall, ceiling, or window. R-Value is measured by insulation value. How many glass layers there are in a window to the type of gas that is between the panes of glass, are some of the basis of this measurement. The higher the R-value, the better insulated are walls and ceilings. The lower the U-value, the better job a window does in keeping out heat and cold. See similar questions...

Earth Blocks, or compressed earth blocks (CEBs), are machine-made adobes, a modern variation on an ancient building material. The blocks are typically composed of 60% soil with high clay content (30-35% is ideal), 35% sand, and 5% lime as a stabilizer to create a water-resistant block. The percentage of each ingredient will vary from region to region depending on soil composition. Each of our earth press machines uses a high pressure hydraulic ram to form approximately 7. See similar questions...

The shape of the Earth is well approximated by an oblate spheroid with a polar radius of 6357 km and an equatorial radius of 6378 km. Any value in that range will do, such as where lat is the latitude in which the bulk of your calculations occur, PROVIDED a spherical approximation is satisfactory. WARNING: The above formula for R gives but a rough approximation to the radius of curvature. According to Snyder ("Map Projections - A Working Manual", by John P. Snyder, U.S. See similar questions...

For information on NASA research and applications to solving problems on earth, please visit the following web sites: See similar questions...

That's a good question, but unfortunately the answer is not so simple, Window thermal performance is measured as a U-Value which Is the reciprocal of the R-Value ( R-Value = 1/U-Value. For example. R 2 = U .50, or 1/.50 = 2) A bit of background: the R-Value measures the resistance to heat loss or gain, while the U-Value measures the transmittance of heat through a material. The higher the number in R-Value the better the resistance, so the better the insulating value. See similar questions...

No. Products with R-values reduce rates of "conductive" heat transfer and are tested for this characteristic. Radiant Barriers provide benefit by dramatically reducing "radiant" heat transfer which is just as quantifiable but not related to R-value type performance. See similar questions...

Sun-dried adobes are made by pouring a mixture of mud and straw into forms on the ground, with the frequent addition of asphalt emulsion, a petroleum by-product, as the most widely used stabilizer. The adobes cure in the sun for as little as two weeks before being used and considerably longer depending upon weather conditions, but do not reach full strength for at least 30 days. See similar questions...

The different machines on the market today produce blocks of varying size. Our machines have the capacity to produce blocks with the following dimensions and weights: See similar questions...

Using 5-8% lime or Portland cement stabilizes the blocks and eliminates concerns about potential water damage during construction. Concrete footers keep the blocks from coming in contact with the ground and a cement bond beam protects the top. Stabilized Earth Blocks are water-resistant, but need protective plastering to be considered completely weather-proof. The compressive strength (PSI) of the blocks is also greatly enhanced by stabilization. See similar questions...