Evening all.  So fitting windows in a icf wall.  My cill area is made up using the cavity closer system from the icf manufacturer (nudura) so I end up with a concrete core and 50mm of eps on top which closes the cavity and forms a no cold bridge type of design, super dooper  however im concerned over the weight of the windows sitting down onto this eps insulation, will they sink over time??   im thinking I need something to spread the load over the eps, something like a