Certainly, the large the air space, there is greater potential for damage in extreme cases. Several years ago, there was a study I was involved with at Florida Solar Energy Center that compared white standing seam (reflectivity of 65% but the metal rested on the roof deck) to a brown metal shingle (reflectivity of 17% but very little of the metal resisted on the roof deck) and the metal shingle was keeping the attic cooler than the white standing seam. The metal shingle was installed direct to deck but the formation of the shingle itself greatly enhanced the overall energy efficiency.
Also looking for ASV products. Is there a hail dent downside to ASV? Decra XD is direct to deck so can only smash the depth of the shake profile. Decra shake is good for over ASV. With ASV and 2.5" void under the metal do you get more damaging and bigger hail dents? Live in a place where Hail only allows built up, concrete, steel and SCS to survive long. Decra and Gerrard don't like to give answers on this.
