Install a Cat Door

Tired of continually opening and closing the door and then have the cat starring in the window 30 seconds later, wanting to get back in?  Let the cats open and close their very own door! For under $30 you can purchase a cat door that will fit the bill nicely.

Cat door
Items needed:
Screw driver
Jig or saber saw
Electric drill and bits
RotoZip (optional for metal sheathing)


Safety Suggestions and Tips
Use a stud finder with AC locator.  
Avoid walls with electric outlets. 
Use safety glasses/goggles
Level of difficulty


Time Required:
 2 hours

Steps

Purchase two-way swinging cat door
Purchase two-way swinging cat door

Step 1:

This unit has a two-way door and magnetic strips to keep the door closed and reduce drafts.  The frame of the door is white but the door is of weather-resistant thermoplastic construction.

Select location away from outlets and studs
Select location away from outlets and studs

Step 2:

Use care when situating the door.  Electric wiring, plumbing and studs need to be avoided as the hole for the door goes completely through the wall.  We recommend using a stud finder to avoid studs.  Some versions also reveal the presence of hidden wiring. Trace around the inner perimeter of the opening to mark the hole.  To ensure that the doors swing freely, enlarge your trace at least 1/8" on all sides.

Cut partial hole and examine wall cavity
Cut partial hole and examine wall cavity

Step 3:

Rather than cutting the entire opening, cut a smaller section, just be sure that there is not a stud.  A jig saw with a 3/8" starting hole drilled first does nicely. If there is any possibility of an electric cable in wall, use a circular saw with the blade set to the depth of the paneling or drywall.

Finish sawing the opening
Finish sawing the opening

Step 4:

As luck would have it, our planned opening ran right into a 2x4 stud.  The opening was relocated to left and then cut to the full extent.

Use sheet metal shears to cut through siding
Use sheet metal shears to cut through siding

Step 5:

The exterior of our installation is sheet metal.  Several 3/8" pilot holes were drilled in the center and metal shear snips used to make the rough cut.  The opening is approximately 1" less on all side from the desired hole. For vinyl siding, use a utility knife to enlarge the opening. For wood siding, use a jig saw.

Trim metal flush using RotoZip
Trim metal flush using RotoZip

Step 6:

Using the cutting wheel of a RotoZip, the opening in the sheet metal was enlarged to the full extent.  Be sure to use safety glasses/ goggles as this will send sparks flying over three feet!  You can use the cutting wheel to feather any sharp edges.

Align inside door unit
Align inside door unit

Step 7:

Align the inside door unit.  Shift left and right to make sure that the doors swing freely.  Shift up and down such that the door does not drag and also opens completely.

Doors swing in both directions
Doors swing in both directions

Step 8:

The door should swing freely in both directions.  Because of a very tight fit, we sanded the outer edge of the clear plastic door slightly to keep it from binding inside the wall.

Screw into wall using pan head screw
Screw into wall using pan head screw

Step 9:

The unit comes with through bolts and nuts, but were not long enough for this application.  Mark the hole for a screw and drill a small pilot hole. Then secure the frame into the wood work using pan head screws.

Outer door secured to sheet metal siding
Outer door secured to sheet metal siding

Step 10:

The outer door is secured to the sheet metal using pan head screws.  Drill a pilot hole first.

Walkout board extender
Walkout board extender

Step 11:

A walkout board may be needed for your cat to perch.


For more information on ordering a cat door, here are a few suggestions: http://www.drsfostersmith.com/product/sc_view.cfm?pCatId=44  http://www.jemarpet.com/catalog/ShowAcc/Staywell.html 
http://www.kittenkaboodle.com/Coming_and_Going4141.html http://www.properpet.com/cat_doors.htm http://www.moorepet.com/store/door.html