Insulation air-raid shelter ceiling

We want to insulate the ceiling in our air-raid shelter. Now we have learned that this is possible, but we have to use isolation pins that can be unscrewed again. Does anyone have any idea where we can find these? So far, we have only found the regular pins, but these cannot be removed anymore.
Who has experience with insulating air-raid shelter ceilings? We tried to get a hole in the wall - no chance! What drills do you use?
Thanks for the help
serasir

Hello serasir, please inquire at the above-mentioned link whether there are suitable fasteners for overhead insulation. Acoustic panels can be glued, so no drill is needed; however, gluing will not work for thermal insulation panels, as the panels are probably too heavy. "Saglan-" and "Sagex-" panels should also be mechanically fastened, as recommended by the manufacturer. Perhaps a technical advisor from the manufacturers can assist you; an air raid shelter ceiling is quite a special case.