I don’t really know what would be classed as a decent amount? Still worth replacing the 50mm polystyrene with kooltherm? Do you have a link to what type I would need?
I have just measured out of the window to see where the vents line up and looks like they are approx in line with the polystyrene
So flooring is
20mm chipboard
50mm polystyrene (in line with vents)
Concreate
80mm Void
5mm plasterboard?
Carport
I have just measured out of the window to see where the vents line up and looks like they are approx in line with the polystyrene
So flooring is
20mm chipboard
50mm polystyrene (in line with vents)
Concreate
80mm Void
5mm plasterboard?
Carport