Not having enough of these protective substances can cause stones. Changes in the Acidity of the Urine. Changes in the acid balance of the urine can affect stone formation. 1  Uric acid and cystine stones mainly form in acidic urine.
1 For an average sized 1,500 square foot roof, that works out to a total PVC roofing cost of $6,000 to $18,000. 2  While certain types of PVC roofing material can be installed over the existing roof, the old roof may need to be removed and disposed of at an additional cost of $1.00 to $2.00 per square foot. While certain types of PVC roofing material can be installed over the existing roof, the old roof may need to be removed and disposed of at an additional cost of $1.00 to $2.00 per square foot.
EPDM rubber roofing average installation cost is $4.00 to $6.00 per square foot, or about $6,000 to $9,000 for a 15 square (1,500 square feet) flat roof. The cost may be higher or lower depending on the tear-off and removal cost of the existing roof, insulation layers, and the number of penetrations on your flat roof. Install Roof Shingles.