Sometimes i ll also use grab adhesive depending on the wall type and the anticipated loading of the shelves especially on hollow walls.
How to make alcove shelves floating. For this you can use doorstop architrave or almost any type of timber you want. Assess the wall get a really strong fixing in the back wall batten. Cut and fix a batten to the back wall at the height you want the shelf. Plane a fillet infill piece.
Grab adhesive was applied to the top and bottom surfaces of the battens prior to screwing the shelf panels in place. Cut the shelf door to size. These were screwed to the wall. Make the most of an awkward alcove or nook with these diy floating wood shelves.
Step by step instructions. This is the order i would attack alcove shelves like this in. This is where you start to allow for variations in your alcove dimensions cutting the size of the battens to the size of the alcove at the individual shelf position.