double cut foam vs plain

Recently got some 5/8" double cut core foam and was supprised by how wide the curfs were 1mm, is this typical? Do they get wider as the foam gets thicker, as to allow it to bend?

1mm curfs the double the resin used in laminating the foam, but does this add significantly to shear, compression and bond to the skins strength? eg M80 becomes M90?

tks

 

The compression strength will be greater if the resin goes from skin to skin. Basically, it is creating a honeycomb. In shear, the increase won't be as significant.

 

The resin doesn't go all the way through, though. What is the application that required the kerfed foam ?