Why sandwich concentrates in dhvs?

[Fartfart]

The general advice for using concentrates in a dhv is to sandwich the concentrates between flower but I have wondered why. I can see the logic if I’m using fire, but aren’t we aiming for higher temps with concentrates, so direct heat would be better?

 

[2tiki]

The general advice for using concentrates in a dhv is to sandwich the concentrates between flower but I have wondered why. I can see the logic if I’m using fire, but aren’t we aiming for higher temps with concentrates, so direct heat would be better?

I think it's to keep the trates from liquifying from the heat and leaking into the oven or other parts of the vape that you don't want getting gunked up. The sandwich is for keeping the trates in place. Some people use hemp fibers, or a metal mesh pad. All for the same reason. Keep the oil from getting into places you don't want.