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.
Pricing Asphalt Shingles. The average cost to install an asphalt shingle roof is anywhere between $1,700 and $8,400 depending on the slope, pitch and size of your roof. The material cost factors into that price, and as such shingle prices vary depending on your location and the specific product.ere are some major brands and types with their average prices per square foot: Owens Corning. 1  Three-Tab Asphalt Shingles : $21.95-$27.95 per square foot â Owens Corning shingles are available at Loweâs and sell for an average price of $21.95 to $27.95 per square foot.