Basic Door Installation
Step 1
Standard construction steps
apply. Proper framing and
sheathing is also assumed as
shown.
The sill is shown as even 
with the deck — perhaps 
the toughest to make level 
as required for proper 
installation.
Drip sill (set down 1/2” to
3/4” is better because it’s 
easier make level after 
the deck is built, and to
accommodate the sill pan. 
Drop sills are more effective 
at keeping water from blowing
under the doors, as well.
These instructions are basic
for either approach.
Step 2
After the sheathing is applied
to the wall, install 9” wide,
flexible flashing on the sill,
overlapping the sill plate, and
up the jambs, 6” to 9” high.
Place a bead of caulk/sealant
along the top of the flashing to
help secure the sill pan.
Prepare metal sill pan, or use
a pre-manufactured plastic
pan and place on top of the
flashing — tight between the
jambs — with the lip of the sill
pan against the sill plate.
If shims are needed, use flat
shims of 1/8” or less. Make
sure they lie in a bead of
caulk/sealant.
Window Fitters Guide to Window Installation 
110                ©2022 AWDI, LLC Do not reproduce without permission
SAMPLE MANUAL

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