WiFi Dead Zones: How Proper Access Point Placement Fixes Office Connectivity

Every office with WiFi complaints has already tried two things: turning the transmit power up, and plugging in a repeater near the bad corner. Both feel logical. Both usually make the problem worse. Understanding why is most of the fix.

Why turning the power up backfires

WiFi is a two-way conversation. An access point can shout across the floor, but a laptop or phone transmits at a fraction of that power. Turn the AP up and devices can now hear it from far away — so they stay connected to it instead of moving to a nearer one, while their own replies never make it back cleanly. You get full signal bars and a connection that does not work, which is the most frustrating failure mode there is.

Raising power also widens the area each AP interferes with. In a floor with several APs, that means more of them competing for the same airtime, and everyone slows down together.

Why repeaters are not the answer

A repeater receives and retransmits on the same radio, so it roughly halves the throughput of everything behind it. Worse, it repeats whatever it can hear — including a weak, noisy signal. You extend the coverage area and degrade the quality inside it at the same time. An access point with a cable back to the switch does the same job without either penalty.

Coverage is not the same as capacity

An empty warehouse needs coverage: reach the far wall. A meeting room with fourteen people needs capacity: serve many devices at once in a small area. These lead to opposite designs. Capacity means more access points at lower power, each serving fewer clients. If your problem is that the office is fine at 8am and unusable at 11am, you have a capacity problem and no amount of range will fix it.

Bands and channels

The 2.4 GHz band travels further and through more walls, but it has only three non-overlapping channels — 1, 6 and 11. In any building with neighbours, that band is crowded before you add anything. The 5 GHz band has far more usable channels and much higher throughput, at shorter range. Design for 5 GHz as the working band and keep 2.4 GHz for devices that need it.

Resist the urge to set the widest channel width available. Wider channels are faster for one client in isolation, but they consume more spectrum, which means fewer non-overlapping channels and more interference between your own access points. In a dense office, narrower channels usually deliver a better experience overall.

Placement rules that matter

• Mount on the ceiling, in the open, near the centre of the area the AP serves. Not in a corner, not on a shelf behind a monitor.
• Never inside a metal rack, a cabinet, or above a false ceiling lined with foil-backed insulation. Metal is the one material that ends the conversation.
• Keep clear of ductwork, lift shafts and large metal shelving. Reinforced concrete walls attenuate heavily; glass partitions much less; mirrors and foil worst of all.
• Plan a modest overlap between neighbouring APs so devices have somewhere to roam to before the current link fails. No overlap means a dropped call every time someone walks down the corridor.
• Run a cable to every AP. It carries power and data, and it is what separates a real deployment from a chain of repeaters.

Survey, then validate

A proper deployment starts with a survey — walking the floor plan and measuring, or modelling it from the drawings with the wall materials accounted for. It ends with a validation walk after installation, confirming signal and throughput at the desks people actually sit at, including the awkward corners. Skipping the second half is why systems get signed off and then complained about a week later.

One local detail

Put access points and the switch that feeds them on a UPS. When the grid drops and the generator picks up, every AP without backup power reboots and every device in the building reconnects at once. Staff experience that as "the WiFi is unreliable", and no amount of radio tuning will ever fix it.