Installation Guide
INSTALLATION INSTRUCTIONS
for Swinging and French Patio Doors
1
Newer construction methods have led to an increase in air and water 
tightness in buildings. This frequently leads to negative air pressure 
inside the house, which can draw water through very small openings. 
Our installation method seals the door to the weather barrier (typically 
building wrap) and uses a sill pan to capture and drain incidental storm 
water from under the door.
Thank you for selecting Lowe’s
®
 ReliaBilt
®
 products. Attached 
are recommended installation instructions for Steel, Fiberglass, 
Vinyl and Wood French and Patio Doors. Read these instructions 
thoroughly before beginning. They are designed to work in most 
existing applications however; existing conditions may require 
changes to these instructions. If changes are needed, they are 
made at the installer’s risk. For installations other than indicated in 
these instructions, contact a building professional.
IMPORTANT INFORMATION AND GLOSSARY
GLOSSARY
Active Panel 
The primary panel or the one that opens and locks into the other panel.
Astragal 
The vertical trim attached to one of the panels of a French door that 
bridges the gap between the panels when closed to provide weather 
and overswing protection.
Backer Rod (backing material) 
A material (e.g. foam rod) placed into a joint primarily to control the 
depth of the sealant.
Brickmould 
A form of exterior casing for windows and doors that serves as an 
aesthetic boundary between the siding and the frame.
Buck 
A wood framework attached to the masonry inside a patio door rough 
opening.
Mull (mullion)  
A wood or metal part used to structurally join two window or door 
units.
Please allow sufcient time to properly prepare the rough opening, 
install the patio door, and ensure its proper operation.
Mulled Unit 
Two or more door units structurally joined together. 
Pilot Hole 
A drilled hole that is no larger than the body of the screw (minus the 
threads).
Shiplap 
The layering method in which each layer overlaps the layer below it so 
that water runs down the outside.
Weep Hole (weep channel)  
The visible exit or entry part of a water drainage system used to drain 
water out of a door.
Not all exterior door types may be installed into every wall condition 
in all areas. Consult your local building code ofcial for applicable 
building codes and regulations. Local building code requirements 
supersede recommended installation instructions.
Please Note! Any French or patio door installation such that the sill 
is higher than 35 feet above ground level or into a wall condition 
not specically addressed in these instructions must be designed by 
an architect or structural engineer. Failure to install square, level and 
plumb and on a at surface (without twist or warp) could result in 
denial of warranty claims for operational or performance problems.
Note to Installer: Provide a copy of these instructions to the building 
owner. By installing this product, you acknowledge the terms and 
conditions of the limited warranty as part of the terms of the sale.
Estimated Install 
Time for New 
Construction
First Time: 4.0 hr.
Experienced: 2.5 hr.
Professional: 1.5 hr.
1
2
3
4
5
6
7
8
9
10
11
12
Step-Down Landing Continuous Slab Landing
LANDINGS
These instructions cover two sill conditions: the step-down landing 
and the continuous slab landing. The installation methods vary slightly 
between landing types.









