I'm getting estimates to replace the underlayment on my 3100sf clay tile roof. One roofer is planning on using 2-Ply SBS TU43. Another roofer has quoted a single layer of Fontana G-40 underlayment.
Are these two products comparable in quality and performance? Is one of these options better for the extreme Arizona heat?
Are these two products comparable in quality and performance? Is one of these options better for the extreme Arizona heat?