"This Ariel Vistalux Corrugated ASB 3" PVC Sheet Flashing is not 3 inch! It is actually about 2.8 inch which means that over it's width of 10 corrugations it loses between 1.5 and 2 inches! Which makes it totally unusable with normal 3 inch profile metal corrugated sheets or even with the 3 inch Corulux PVC corrugated sheets. I don't understand why it should be wrong as it is clearly marked (each sheet has a sticky label) as 3 inch. Very, very disappointed."