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.
Because of the enormous scale of its projects, the segment sees system prices that are nearly $2 per watt cheaper than the residential segment. Turnkey installation prices for fixed-tilt PV systems fell from an average of $1.77 per watt in the first quarter of 2014 to $1.55 per watt in the fourth quarter.The report notes significant variance in system pricing in the utility-scale segment, ranging from as high as $2.10 per watt or as low as $1.40 per watt.owever, system prices continued to fall, despite the lack of installation growth. Driven by significant reductions in balance-of-system costs, the cost for a medium-scale commercial system averaged $2.25 per watt by the end of 2014. This is down from $2.53 per watt in the first quarter of 2014.