All repairs, regarding both bitumous laminate membrane laying and maintenance should be carried out by technicians who are specialised in these kinds of products.

No membranes covered in aluminium or copper can ever be placed above insulating panels. Both due to the possible instability of the insulation itself and due to the high temperatures that coverings of this type can reach. 
A copper covered membrane can reach very high temperatures (70°C/80°C) during the summer months and such temperatures could compromise the metallic membrane’s adhesion to the bitumous mass provoking a delamination.

The membranes which show the least thermal effects are those made of natural aluminium. As they are photo-reflective they keep the membrane/system temperature lower.

During periodical inspections the areas which are beginning to show signs of delamination should be checked (and, if necessary, repaired). A badly timed intervention can worsen the situation due to the effect of wind or the presence of dust which can come between the laminate and the bitumous mass, which would increase the risk of short term damage.