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.
To give you an idea of cost, wooden sash windows can cost around Â£1,300 each, whilst uPVC tend to be cheaper at about Â£700 per window. Sash double glazing windows are still much more expensive than getting traditional double glazing, which works out at about Â£300 per window on average.As we have mentioned elsewhere, it is never cost effective in terms of energy efficiency to switch to double glazing, even on an older property with large sash windows.PVC Sash Windows. uPVC sash windows are now available, and they are about a third cheaper than wooden sash equivalents. The advantage of uPVC of course is that less maintenance is required, and they generally come with lengthy guarantees, but their lifespan is likely to be less than well maintained wooden sash windows.