| There should be a
3/4" to 1" over lap for your sliding door at the top of the door opening. The
door should
also be approximately 3" to 4 " wider than the door opening.
This overlap will insure that the door opening is completely covered by
the door. So this allows
1-1/2" to 2" overlap on each door side. Please keep in mind
that doors can always be shortened on the job
site by using a metal chop saw to shorten vertical and horizontal frame
members if necessary.
When assembling the door keep the top rail (girt) flush with
the side rail as shown in Figure 7.

Figure
7
Picture © 2006
However, when you slide the bottom rail into the side rail, the
bottom rail hangs down 2 inches below the side rail as shown in
Figure 8.
Click here for specification of bottom door rail
Figure
8
Picture © 2006
Lay the J-Cannel, that's the lip on the bottom
rail and side rails down as shown in
Figure 9. Once the frame is complete and the door is
hung, the J-Channel on the door will be facing toward the outside of the
building and the door skin will be applied to that side of the door.

Figure
9
Picture © 2006
If you don't know
what the J-Channel on the door is for. I'll briefly explain it.
First, the J-Channel is 3/4" deep. This is deep enough for a
standard 3/4" thick board you normally purchase at your lumber yard.
It can also accommodate thinner sheet metal. If you use sheet metal and
the sheet metal rattles in the wind, it may be necessary to run a bead of
caulking around the sheet metal along the J-Channel.
Regardless of what your using, if the product is 3/4" or
thinner, it will slide behind the J-Channel on the
edge of the door, thus giving it a nice finished look as shown in
Figure 10 . In this figure I used a white
board 3/4" thick as an example. I intentionally did not bring it
down flush with the bottom rail to show the board behind the J-Channel
on the side rail.

Figure
10
Picture © 2006
There is no J-Channel on the bottom rail, thus the door skin just
sits on this rail. Also there is no J-Channel on the top rail, so
when your applying the door skin, make sure it is level at the top,
because it will be totally exposed to the eye. Don't worry because
there's no J-Channel at the top, if it's straight it will look great.
Surely none of your Good Friends will get on a ladder and check
the top metal with a straight edge and then make comments about
it.
Finally - Assembly
Drilling Trolley Holes
First, take a girt and drill a hole in
it for your trolley to mount to. It's best you do that now,
because it's much easier to drill the hole with the girt laying down.
If you wait until the door frame is assembled your going to have to
drill the hole in a horizontal position. Lay the girt down with a
piece of lumber under it. I would use a 2 by 4 because of its
thickness. Use a drill bit that is at lease 4 inches long because
your going to drill the hole through the top of the girt right through
the bottom of it (3-1/2"). That's why you need a 2 by 4 under it.
If you don't have something under it, your drill bit is going to go
right through the bottom of the girt into the ground or hard concrete.
Save that Bit.
On doors 6 feet wide to 12 feet wide,
drill the trolley hole one (1) foot from each end of the top girt as
shown in Figure 10a
On doors 13 feet wide to 20 feet wide,
drill the trolley hole two (2) feet from each end of the top girt as
shown in Figure 10a
Trolley holes should be a minimum 17/32"
in diameter. If you don't have a 17/32" drill bit, use one a
little larger. The next one up is a 9/16".
Figure
10a
Now, lets lay the door frame out on a level surface
such as a drive way or floor of the building you are working on.
The more level the better, because if you lay the frame out on an uneven
surface the new frame will probably be assembled with a bow in it.

Figure 11
Picture © 2006
When assembling
the door you must keep it square. Do Not use a square, it won't work
this time, the door frame is to big and your square is to small.
If you have never squared something this large before, it's quite
simple, there is no math involved.
Lay the top rail out, the bottom
rail out and the two end rails out as shown above in
Figure 11.
Use one
#8 self-drilling, self-tapping screw in each corner of the door frame as
shown in Figure 12A and 12B.

Figure
12 A
Picture © 2006 When applying the screw, screw it in the
extruded pilot groove of
the rails as shown in Figure 12B. This keeps the screws in alignment with
each other up and down the side rails and gives the door a nice
appearance.

Figure
12 B
Picture © 2006 |