Maglock Installation for Spring Branch Warehouses, Storefronts and Offices

The doors a maglock meets in 77055

Spring Branch is a working neighborhood that is also rebuilding itself. North of the Katy Freeway, the blocks between Long Point Road and Hempstead Highway hold office-warehouses, machine and auto shops, church campuses and strip centers, while the old ranch-house lots behind them keep turning into gated townhome rows. A magnetic lock can work on almost any of those openings, but the mounting, the wiring route and the exit rules change with each one.

The principle is simple: an electromagnet fastened to the door frame header, a steel armature plate bolted to the door, and a DC current that bonds the two together. Cut the current and the door is free. There is no latch to wear out and no wire has to cross the hinge, because the armature is passive steel. That is why maglocks are popular on steel warehouse doors and glass storefronts that are awkward to electrify any other way.

After that, three things decide the job: faces that meet flat, full rated voltage at the coil, and an exit side that releases every single time.

• Office-warehouse and flex space along Hempstead Highway and the rail corridor: hollow metal doors set in concrete block or tilt-wall, frequently with the frames grouted solid.
• Strip-center tenant doors on Long Point and the surrounding arterials, including the restaurants, salons and offices of Houston’s Koreatown: aluminum storefront with narrow stiles and thin headers.
• Churches, schools and daycares: interior corridor doors, some of them fire-rated, where the lock has to cooperate with the building’s alarm system.

How the mounting changes from one door type to the next

The magnet always goes on the secure side of the opening. Where it sits after that depends on which way the door swings and what the frame is made of.

Storefronts deserve a second look: narrow stiles leave little metal for the armature bolt, and an aluminum header can bow under a locked door. Where the header cannot carry the magnet cleanly, we will say so and suggest an electrified exit device or a concealed shear lock instead.

Getting power to the header when the frame is full of grout

Hollow metal frames set in concrete block are often grouted solid for strength. That is good for the frame and bad for anyone who wants to fish a cable down the jamb, because there is no cavity left to fish through. Tilt-wall panels create the same problem in a different material, and most of the older flex buildings in 77055 have one or the other.

We choose the route by what the space will tolerate:

• Exposed conduit in a warehouse or shop, where a clean EMT run from the ceiling down to the header looks like every other circuit in the building and protects the cable from forklifts and ladders.
• Surface raceway in a finished office, painted to match and entering the magnet housing from above.
• A drilled frame head when the head is still hollow even though the jambs are grouted, which is common.

The magnet end usually needs four conductors or more: two for lock power and two for the bond sensor that reports whether the armature is fully seated. A door-position switch adds another pair. Those home-run to a dedicated lock power supply sized for the number of doors, rather than hanging off the small auxiliary output of an access controller.

Because most Spring Branch businesses are tenants, we ask about the landlord before anything is drilled. Many commercial leases require written approval for penetrations in the storefront or the demising wall, and that approval is easier to get before the install date than after it.

What has to happen when someone walks out

A maglock is fail-safe by nature, but on an egress door the building code expects several independent ways out, and a missing one is the usual reason a maglock fails inspection.

For the usual arrangement, where a motion sensor above the door releases the lock as someone approaches from inside, the model code calls for:

• A sensor on the egress side that unlocks the door on detection, and also unlocks it if the sensor loses power.
• A manual button marked PUSH TO EXIT, mounted 40 to 48 inches above the floor within 5 feet of the door, that cuts power to the lock directly, independent of the access control electronics, and keeps the door unlocked for at least 30 seconds.
• Release when the building’s fire alarm, sprinkler or detection system activates, staying released until the alarm is reset.
• Automatic unlocking whenever the lock itself loses power.

The word that matters is directly. The button has to break the lock’s power circuit on its own, not merely send a request to a controller that then decides what to do, so we wire it in series with the lock power. The alternative is door hardware release: a lever or exit bar with a built-in switch that drops the lock in the same motion that opens the door. On a shop door where a motion sensor would see forklifts and carts all day, that is often the cleaner answer.

The code also limits locking public entrances from the inside during business hours, so a retail or office front door usually runs its maglock on a schedule. The reviewing inspector has the final word.

EVOTECH’s sequence on a Spring Branch tenant door

1. Walk the door with you. Swing, frame, closer condition, who needs in, and whether there is a fire alarm panel to tie into.
2. Fix the door first. A maglock cannot hold a door that sags, binds or bounces off the stop, so we adjust or replace the closer and flag hinge wear before mounting anything.
3. Mount and align. Magnet on the header, armature on the door, checked for full-face contact with the door closed, confirmed by the bond sensor rather than by eye.
4. Pull and terminate cable along the route agreed at the estimate, labeled at both ends.
5. Install the exit devices: a motion sensor aimed and masked so it only covers the approach from inside, and the push-to-exit button at code height.
6. Connect power and the alarm release. A lock power supply with battery backup and a fire-alarm input; where the building has a panel, we coordinate the final connection with the fire alarm company that services it.
7. Test it the way a user and an inspector would: badge in, walk out, press the button and time the hold, pull power, trip the alarm input, and confirm the lock releases every time.
8. Hand over the schedule settings and a contact for service.

What changes the price of a 77055 maglock job

The quote is itemized after we see the door. These are what move it:

• Single door versus a pair, and whether the pair has an astragal that needs a coordinator.
• Door and frame material, and whether brackets, filler plates or header reinforcement are required.
• The wiring route: an open ceiling above a warehouse door is quick, while a grouted frame in a finished office means raceway or conduit.
• Exit hardware: a motion sensor and button, or an exit device with an integral switch.
• Whether the lock joins an existing access system or needs its own reader, keypad and controller.
• Fire alarm interface and coordination with the alarm contractor.
• After-hours scheduling so a shop or restaurant can stay open while we work.

Mistakes that bring a maglock installer back

• An armature bolted rigid. The armature should rock slightly on its rubber washers to find the magnet face. Cranked down, it meets at an angle and holds a fraction of its rating.
• A motion sensor that sees through the door. Aimed too wide, a passive infrared exit sensor can be tripped from outside through the gap or the glass. We aim and mask the pattern so only someone inside can trigger it.
• A button that only talks to the controller. It works until the controller freezes, and then nobody can get out the way the sign says.
• An ignored closer. A door that stops half an inch short never bonds, and the event log fills with door-held alarms.

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