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.
Ceramic roof tile costs starts at approximately $5 to $15 per square foot but could cost as much as $15 to $30 per square foot or more. For a 2,000 square foot roof, this amounts to a total cost of around $10,000 to $60,000. Concrete roof tile costs are generally around $5 to $10 per square foot, or $10,000 to $20,000 for a 2,000 square foot roof. Tile is a heavy material, and it is sometimes necessary to upgrade a home's structural support to accommodate the added weight of a tile roof.