Window Locks, Stops, and Patio Door Bars

What secondary hardware does

Secondary window hardware adds a second physical decision point to the opening. The factory latch indicates that the window is closed. A bar, pin, or stop adds a requirement to lift, pry, remove, or break something else. That additional step, even a small one, is often enough to redirect an opportunistic intruder to an easier target.

How sliding doors fail

A sliding door has two movements: slide and lift. A good bar blocks sliding and incorporates an anti-lift feature that resists lifting the panel out of the track. A broomstick or loose dowel addresses only the sliding motion; it does nothing if the panel can be lifted.

The latch also matters. Most factory sliding-door latches are hook-style and can be popped with a shim. Secondary hardware does not replace a properly functioning latch; it supplements one.

Inspect your windows in 5 minutes

• Can the patio door be lifted in its track?
• Does the patio bar lock in place, or does it simply rest in the track?
• Do any window stops limit an egress opening?
• Are casement locks tight, or can the sash be pried?
• Are basement windows reachable and hidden from the street?

Egress is non-negotiable

Secondary hardware that limits window opening can block emergency exit. Before installing any stop, pin, or bar:

1. Identify which windows are required egress openings under the Quebec Building Code.
2. Measure the clear opening width, height, and area the window provides when fully open.
3. Confirm that any hardware installed does not reduce that opening below the code minimum.
4. Never restrict a bedroom or basement egress window to a point where a person cannot exit.

DIY versus professional installation

Patio bars are generally safe to install as a DIY project when the manufacturer's instructions for track placement and anti-lift engagement are followed. Window pins and stops require more care because of egress considerations. For egress windows in particular, a professional assessment is often the safer path.

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What this hardware does not replace

Secondary hardware adds friction. It does not stop someone willing to break the glass. For glass beside a reinforced door, or any reachable ground-floor opening, 8-mil security film with edge attachment should also be considered.