Instructions / Assembly

The BILCO Company, P.O. Box 1203, New Haven, CT 06505 • [phone] • www.bilco.com
Printed in U.S.A. 2004 ©2017 The BILCO Company
SD 474 Rev. 2.0
BILCO Stair Stringer
Installation Instructions
1”x 1”
notch
Note: (6) masonry nails are sufcient for
anchoring each stringer, (3) nails through top ange
and (3) nails through bottom ange. Additional mounting
holes are provided on stringer for anchoring hole loca-
tion exibility when installing on concrete block walls.
Figure 2
Secure treads with 8-penny
nails provided. Drive nails
through hole in stringer and
straight down in step
Figure 3
BILCO Door
Stringer
tight
against
outer
wall
Vertical Door
FINISHED FLOOR LINE
Draw
level line
8-1/4”
above
nished
oor
Line up lower
anchor holes
on stringer
with level line
Figure 1
Note: See reverse side for stairwell dimensions
and BILCO Door and Stair Stringer sizes for vari-
ous grade conditions.
To Install:
Measure up from the nished basement oor line and draw a
level line on the wall as shown in Figure 1. Place one stringer
up against the wall and line up the lower anchor holes on the
stringer to the level line on the wall. Make sure that the top of
the stringer is up tight against the outer wall, The stringer is
now in position to be anchored. Anchor stringer to wall through
the anchor holes in the stringer using the 1-1/4” long masonry
nails supplied. Use (6) masonry nails for each stringer.
When installing the stringer against a masonry block wall, it
is necessary to anchor into the solid part of the blocks or into
the joints between the block. The masonry nails will not hold if
driven into the hollow part of the block. If some anchor holes do
not line up with a joint or solid portion of block, you can make
your own holes by driving the masonry nails through the steel
stringer. Use (6) masonry nails for each stringer.
Using standard 2 x 10 lumber (actually measures 1-5/8” x
9-1/2”) cut off the required number of pieces to be used for
treads to a length of 2” less than the width of the masonry
opening. On one piece only (to be used for the top tread) the
two rear corners must be notched out as shown in Figure 2
to allow the tread to t snugly against the outer wall.
It is generally easier to install the second stringer by level-
ing from the rst installed stringer. Place the second stringer
against the opposite wall and insert the top and bottom treads
by sliding them into the slots provided in the stringers. With
the treads level, and the stringer tight against the outer wall,
the second stringer is in position to be anchored to the wall
following the same procedure used to anchor the rst stringer.
Insert all of the treads into the slots in the stringer and secure
all treads with the 8-penny nails provided. Use one nail in each
end of each tread utilizing the holes supplied in the stringer,
see Figure 3.
Experience. Innovation.