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.
On average, tile roofs cost $700 to $800 per square to install, though they can cost anywhere between $400 and $1,000 per square. Tiles come in clay or concrete but can be shaped in many different ways even to the point of looking like wood shake.our house will never be âfire-proofâ, but a tile roof can make it âfire resistantâ. Clay and concrete have Class A fire ratings. What this means is that your roof wonât catch fire. During the Oakland Hills fire in California, embers falling on roofs were the biggest reason many homes caught fire.