Keypad Door Access Installation in Houston 77099: Strikes, Maglocks and Wiring

What keypad access means in a 77099 flex suite

Picture a typical office-warehouse unit: a glass or steel front door into a small office, an interior door onto the warehouse floor, a steel man door beside the overhead door at the back, and sometimes a pedestrian gate in a perimeter fence. Each opening can take a keypad, and each wants a different lock.

Because the landlord may own the doors while the tenant owns the access system, we start with practical questions: who keeps the hardware at move-out, which doors are required exits, what is already inside the walls, and whether one system should run every door or each door can stand alone.

Alief’s apartments and 1970s-80s houses get a short answer in the FAQ; the rest of this page is about wired doors, where installs tend to go wrong.

The six parts of a wired keypad door

1. Keypad or keypad reader. Either a standalone unit with a built-in relay, or a reader that passes the entered code to a controller.
2. Controller. Holds the user list, schedules and event log, and decides when to energize or de-energize the lock. On a single standalone keypad, the keypad plays this role.
3. Locking device. A strike mounted in the jamb, an electrified lockset in the door, electrified trim on an exit device, or an electromagnetic lock.
4. Power supply. A regulated 12 or 24 VDC supply sized for the lock and reader, with a standby battery.
5. Request-to-exit (REX). A motion sensor or switch that tells the system someone is leaving, so a normal exit isn’t logged as a forced door. For maglocks it is also part of the release path.
6. Door position switch (DPS). A magnetic contact that reports whether the door is actually shut, which enables door-forced and held-open alerts.

A standalone keypad driving a strike uses items one, three and four; controller-based systems use all six. Skip the DPS and REX and you lose any record of a propped or forced door.

Fail-safe or fail-secure: decide before you order

Every electric locking device is one or the other. Fail-safe hardware is unlocked when power is removed; fail-secure hardware is locked when power is removed. Neither choice affects getting out: a fail-secure strike controls the outside only, and the inside lever or push bar retracts the latch mechanically with or without power.

Outages here are not theoretical. Storms have left parts of Houston without power for days, as after Hurricane Beryl in 2024. A standby battery keeps a fail-secure keypad door working for hours rather than days, so everyone who might need to get in during a long outage should know where the mechanical key override is.

Maglocks: when they fit and what the code demands

An electromagnetic lock is a coil on the frame header that clamps a steel armature plate mounted on the door. Common holding-force classes are around 600 and 1,200 pounds. They mount on doors that can’t take a strike, which is why they are popular on glass. They also carry obligations, because a maglock holds the door no matter what the lever does. On an egress door, the building code generally requires:

• A sensor on the inside that releases the lock as someone approaches to exit.
• A separate manual release, a push-to-exit button near the door, that cuts lock power directly, independent of the other electronics, and keeps the door unlocked for a timed interval.
• Release on loss of power, which is inherent in how a magnet works.
• Release on activation of the fire alarm or sprinkler system in buildings that have one.

The fire official with jurisdiction has the final word on each opening. We don’t install a maglock where an electric strike or electrified lever would do the job, because those keep the door latched and the exit purely mechanical. Where a maglock is the right answer, the armature must sit flat and centered on the magnet: a misaligned plate holds at a fraction of its rating and gives a false sense of security.

Electric strikes in hollow-metal frames

Most steel man doors in these flex buildings hang in hollow-metal frames, and frames set in masonry or tilt-wall construction are often filled with grout. That matters because an electric strike needs a deeper pocket in the jamb than the original strike did. In a grouted frame, grout behind the jamb has to be chipped out cleanly and a cable path created before the strike can sit flush.

• Match the strike to the latch. A cylindrical lever, a mortise lock and a rim exit device each need a different strike body. A rim panic device takes a surface-mounted rim strike; vertical-rod devices usually call for electrified trim or motorized latch retraction instead of a strike.
• Check latch engagement and the door gap. If the latch doesn’t reach far enough into the strike’s keeper, or the gap is wider than the strike tolerates, the door can be pulled open under load.
• Plan for preload. Weatherstripping, wind on a west-facing door, or someone pushing while entering puts sideways pressure on the keeper. Use a strike rated to release under preload, or adjust the stops.

Power budget, wire gauge and data protocols

A keypad door fails electrically in predictable ways, so we calculate before we pull cable.

• Current draw. Total the lock, keypad and accessories, then size supply and battery with margin; a supply near its limit runs hot in an unconditioned warehouse.
• Voltage drop. Lock current over a long run of thin conductor loses voltage, and a strike that needs 12 V but receives much less may buzz instead of releasing. Heavier gauge for lock power, or a 24 V lock on long runs, solves it.
• Coil suppression. Strikes and maglocks are inductive loads. A diode or suppressor across the lock terminals keeps the switching spike from eroding relay contacts.
• Wiegand versus OSDP. Many keypad readers still talk to controllers over Wiegand, a one-way, unencrypted format generally limited to runs of about 500 feet. OSDP uses a two-wire RS-485 bus, handles longer distances, supervises the reader, and with Secure Channel encrypts the traffic. On new installs we favor OSDP wherever the controller supports it.
• Warehouse routing. Under open bar-joist ceilings, cable belongs in conduit or properly supported from the structure, clear of forklift paths and away from the roll-up door’s operator and tracks.

Signs this is a job for a low-voltage contractor

A battery keypad lever on an office door can be a do-it-yourself swap. Everything else on this page generally is not. Bring in a licensed contractor when the plan includes an electric strike or maglock, any fire-rated door or required exit, several doors that share one user list, cable through block walls or warehouse ceilings, or a connection to a fire alarm. In each of those, a wrong choice either locks people out, locks people in, or quietly leaves the door unsecured.

EVOTECH’s installation sequence on a 77099 job

1. Survey and classify every opening: exit or not, rated or not, frame type and fill, latch type, closer condition, and route to power.
2. Choose fail modes and locking devices door by door, with the reasoning written into the quote.
3. Work out the power budget and wire gauges, and decide between standalone keypads and a controller based on user count, logging and schedule needs.
4. Deliver an itemized quote, including any door or frame correction that must happen first.
5. Install: frame prep, locking device, keypad at an accessible height on blocking or masonry, REX and DPS where used, supply and battery, coil suppression, and labeled terminations.
6. Commission: test every code, schedule and log entry; cut AC power to verify fail mode and battery run time; confirm mechanical exit from inside and, on maglocks, every release path.
7. Leave an as-built record: a wiring drawing, owner-held admin credentials, and the mechanical key location.

What moves the price of a wired keypad door

• Door count, and whether the doors share one controller or stand alone.
• The locking device: strike, electrified exit trim, electrified lever, or a maglock with its sensor and release button.
• Frame condition and fill; a grouted hollow-metal frame takes more labor than a wood jamb.
• Cable distance, ceiling type, and whether conduit is required.
• Fire alarm interface where maglocks or rated openings are involved.
• Controller licensing or software subscriptions on managed platforms.
• Work scheduled around business hours or warehouse operations.

Pricing follows the on-site survey as an itemized quote.

Wiring and hardware mistakes that bring us back

• Lock powered through the keypad’s own terminals. Small standalone keypads can’t always carry a strike’s current, let alone a maglock’s continuous draw; the keypad relay should switch a separate supply.
• No REX on a monitored door. Every ordinary exit logs as a forced door, and within a week everyone ignores the alarms.
• A maglock armature bolted off center. Holding force drops sharply and the door can be pulled open.
• A standby battery never replaced. Sealed backup batteries wear out in a few years, and a dead one turns the next outage into a locked-out morning.

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