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.
Asphalt Shingles account for about 90 percent of all residential roofing materials sold each year in the US. Whenever a contractor is measuring a roof, they know that each square of roofing shingles is 3 bundles (for the most part), and if you have 20 squares of roofing, you will need 60 bundles of shingles.