How to restore an old coat with a worn-out outer layer of shaving and lining?

PROBLEM: how to restore an old coat with the outer layer of shaving and coating completely deteriorated

In some cases we find ourselves facing old insulated walls with improvised systems lacking any coding.

Insulation coats without protective cover, coats with insufficient or inadequate smoothing layers.

Coats with non-overlapping mesh, without any possible anchoring.

In such burdensome situations, it usually is advisable to intervene with significant restorations that also involve removing the entire crust formed by smoothing, mesh, and coating, in order to start again from the intact surface of the insulation panel.