Walls, concrete, brick and floors can significantly weaken WiFi. Not every obstacle attenuates the signal equally; material, thickness, the number of walls and frequency all matter. In a multi-storey home, a floor slab can matter more than the raw distance between router and device. WiFi planning should therefore consider the signal path, not just floor area.
- Concrete and reinforced-concrete floors block WiFi far more than drywall or wood partitions.
- Steel rebar inside concrete can weaken the signal more than the wall's thickness alone.
- In concrete buildings, an extra access point usually helps more than a stronger router.
FAQ
Does thicker concrete always block WiFi more?
Usually, but the steel rebar inside the concrete matters just as much — the reinforcement grid can weaken the signal more than the wall's thickness alone.
Does WiFi pass through the floor between storeys?
It does, but a reinforced-concrete floor slab attenuates the signal about as much as a concrete wall, so one router rarely covers two floors well.
Does 5 GHz struggle more with concrete than 2.4 GHz?
Yes, higher frequencies are attenuated more by dense materials like concrete, so in these buildings 2.4 GHz often has a real range advantage.
upload the plan, mark walls and important areas, and compare router or mesh positions.
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