Keller W2200 Serie Instrucciones De Instalación página 16

Section 1.6 (continued)
FRAMING THE ROUGH OPENING
Installing Stringers:
STEP 1. Measure the stringer length "S" between
the headers (See Figure 17).
STEP 2. Cut a stringer to this length. Use
joist-sized lumber.
STEP 3. If the ceiling joist does not provide one
side of the frame, then cut a second
stringer the same length as the first one.
Note that only one stringer is needed in
Figure 17 because the ceiling joist
provides one side of the frame.
STEP 4. Position the stringer(s) along the
unframed side(s) of your location
(See Figure 18). Check that the inside
dimensions of the frame are 22-1/2" x 54"
(W2208, W2210 and WU2210) or 25" x 54"
(W2508 and W2510).
STEP 5. To attach the stringer(s) to the headers,
use nails that are long enough to go
through both headers and into the
stringer at least one inch. Square the
stringer(s) to the headers at one end and
drive (3) 16d nails through the headers
and into the stringer.
Check for squareness, then nail the other
end. Check the rough opening for
squareness by measuring across the
diagonals. The two measurements
should be within 1/8" to be considered
square (See Figure 18).
PROCEED TO STEP #4 (page 4) - PREPARING/MAKING THE ATTIC LADDER OPENING
16
YOUR ROUGH OPENING IS PREPARED
FIGURE 17
Diagonal
measurements
Headers
FIGURE 18
S
Headers
Stringer
Nails