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 A wood lattice based roof can cost anywhere from $600 to $6,000 depending on the size. 2  A gazebo can cost anywhere from $2,000 to $7,000 or more. 3  Custom made patio covers made of acrylic or glass can cost anywhere from $2,600 to $12,000. On average, plan on spending $10 to $50 per square foot, depending on the materials selected. 2  A simple patio umbrella that covers a majority of a patio can cost anywhere from $45 to $200. 3  For example, the Coolaroo 11 feet round patio umbrella retails for $110 to $160.