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.
For 480 square feet of roof how many bundles of shingles do you need? How many square feet does a bundle of roofing shingles cover? About 32 square feet. An easy way to remember this is 1 bundle is needed for every 4' x 8' sheet of plywood on your roof.