Extension Open Stringer with Shadow Gap

It is now possible to slide the open stringer over the visible tread edge to create a shadow gap between the wall and the tread edge.  This is particularly useful for shaft staircases installed between two walls. With this type of stair, the walls are not always perfectly straight, and it can happen that the treads do not fit between the walls if the treads are made to fit exactly. To avoid this, a mounting gap is required. This is created using the Open Stringer with Shadow Gap option. The stringers can be screwed directly into the wall and the treads and risers can be fitted from above. The resulting shadow gap can later be concealed with a skirting board along the staircase.