Instructions / Assembly

Construction Guide
Stairway Details
Size O
Door and Stair Stringers
Size B
Door and Stair Stringers
Size C
Door and Stair Stringers
Size SL
Door and Stair Stringers
Showing areaway dimensions for four BILCO Door sizes and sectional
views of Stair Stringer installations for normal grade conditions.
for building areaway to
suit various grade conditions
This chart was developed to aid builders in the construction of the masonry stairwell to the proper inside length, width and height for various
grade conditions. First, determine the approximate height that the grade will be above the nished basement oor. With this dimension, refer
to the rst column of the chart below and nd the range in which this grade height falls. Read across the chart to determine the dimensions of
the areaway and the size and dimensions of the BILCO Door and Stair Stringers required.