The concentration of creatinine is a better indicator of renal. function than urea or uric acid because it is not affected by diet, exercise, or hormones. The creatinine level has been used in combination with BUN to differentiate between. prerenal and renal causes of an elevated urea/BUN.
Roof surfaces are measured in squares.. A square is an area of roof which measures 100 square feet. To determine the number of squares on the gable roof above, simply divide its total of 24,000 square feet by 100. The result is 240, and this means you would need 240 squares of shingles to cover that roof.
CALCULATING and PACKAGING SHINGLES. The amount of asphalt shingles required to cover a roof is calculated by the square. A square is an area 10x10 feet. Shingles are sold by the bundle, and a square may contain from three to six bundles, depending on the shingle design and exposure.hree-Tab Shingles. This is a three-tab (or 3-tab) shingle. It s a type of strip shingle. Its main identifying feature is two notches, called cutouts, which separate the lower part of the shingle into three tabs, as you can see here. A three-tab shingle is a single layer thick, usually 12 inches wide and 36 inches long.