We will need: two twine nails
1 x patch cord
1 x Bubble Level
1 x Folding Ruler
1 x pouf
1 x curb tongs and 1 x shovel
curbs
Excavation of the shelf (rough)
Insert twine nails accordingly
Tension the cord parallel to the board (note slope)
and fix
excavate according to the depth of the curb
Plan substructure
Check excavation depth
Insert the shelf vertically and horizontally with curb pliers
horizontal control
plumb control
Fasten the curb with dry mortar or sand
fill up
and solidify
Finished!