Exactly, I used Lohr for a house in Pattaya, waste of money, traps the heat in the roof void and doesn't allow it to breathe, if you do have a leak from the roof, which we did its an absolute nightmare to repair, sure Lohr give you a guarantee, which means they eventually arrive on site and ask you what you wont to to do?
Without ceiling insulation you are paying to cool the roof void, which still gets very hot no matter what you use to insulate the actual roof. Better to treat them as to separate areas, air flow through the roof void, insulate directly above the rooms you need to be cool