Well, you can be very sure that Andre has substance behind his short statements.
Brian, I don't know the density of the pink stuff, but at that thickness I would want to be down around 2 pcf. 705 would certainly not be a good choice.
Expensive heavy, and not the best performer at that thickness.

However, for Staab's traps one might consider 10cm of 100KG with a 10cm airgap behind. One wonders would that perform better or be cheaper than a full fill of 40KG. I suspect the latter, but Andre?

Staab, apart from the theoretical questions, rest assured, it really is not critical, and 40KG will definitely work if you just want to get on with it.


DD