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.
Step 2: Estimate your cost per Watt installed. Hint: If solar is popular in your state (CA, CO, NJ) and you have asphalt or composite shingles, then use $4-$6/W. If solar is less popular in your state (VA, TX, MI) and you have a tile roof, then use $6-$8/W.If youâre unsure, $5.5/W is about the National average.his calculator assumes no State or Utility rebate. Go to www.dsireusa.org to see if your area offers solar incentives. If it does, subtract it first from the Estimated System Cost. This is your total cost of installation. Then calculate the Fed Tax credit by multiplying the result by 30% (0.3).