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.
1 The cost of a PVC pipe varies widely. 2  Among the factors that may directly or indirectly affect its cost are the following: location or state, size, quality, type or specifications, and the store or seller. 3  Depending on the diameter of the PVC pipe, plan on spending around $0.15 to $2 per foot. According to Home Depot a PVC pipe costs around $0.47 to $12.17. 2  For example, a Â¾ inch PVC elbow costs $0.47 while a Â½ inch x 10 feet PVC plain end pipe costs $1.81.