The repair of delaminations is designed to prevent further detachment of stone, to establish a cohesion between exfoliated layers, and to prevent the penetration of water. Whether an edge detachment or a full detachment (in single or multiple layers), conservation treatments are typically the same.
Loose stone particles and other debris in the void behind the delaminated layer are carefully removed using a low pressure air wand. When necessary, the interior is cleaned by flushing with a wetting solution.
For sandstones, to ensure adhesion of grout within the void interior, surfaces are treated with a consolidant before filling. After complete curing of the consolidant, a flowable grout pigmented to match stone is gravity fed or injected into the void. Grouting is done from the bottom up, using a temporary backer rod. With large voids, grouting is done in “lifts”.