Creating A Rough Opening; Important Questions - Keller W2200 Serie Instrucciones De Instalación

Appendix

CREATING A ROUGH OPENING

Section 1.1

IMPORTANT QUESTIONS

Is your ceiling and joist structure suitable for this installation?
This attic ladder can be installed in structures with
conventional wood roof frames (See Figure 1). If there is a
ceiling, you must have an access hole in the ceiling that
allows you to enter the overhead space for a pre-installation
inspection.
Roof support structures that have braces connected to the
ceiling joists or which use trusses (See Figure 1) cannot be
cut without destroying the load-bearing capacity of that
section of the roof. Do not cut joists that are part of a
braced conventional frame or truss without first consulting
an architect or structural engineer (see the Yellow Pages
under "Architects or Structural Engineers").
The attic ladder should not be installed in a ceiling that has any of the following:
– components of heating/cooling systems embedded in the ceiling
– joists made of materials other than wood
– metal reinforced plaster
– suspended ceilings
If your ceiling contains any of the above, do not attempt to install the attic ladder. Contact a professional for assistance
with your specific needs (see the Yellow Pages under "Heating and Cooling Contractors, Building Contractors,
Carpenters, Home Builders, Home Improvements, or Contractors-General").
Do these instructions meet your needs?
These instructions describe how to install the attic ladder parallel or perpendicular to the ceiling joists.
Contact a professional if you want the attic ladder installed in some other direction relative to the joists.
Is your ceiling and joist structure suitable for this installation?
Ceiling Joist
Truss Roof Frame
Do not cut these types of structures without consulting an architect or structural engineer.
Rafter
FIGURE 2
WARNING
Ceiling Joist
Conventional Roof Frame
FIGURE 1
Ceiling Joist
Braces
Conventional Roof Frame with
Braces Connected to Ceiling Joists
Rafter
Rafter
7