In today’s connected world, reliable WiFi is essential for both schools and offices. However, the performance of WiFi networks can be significantly affected by the materials used in building construction. This blog post explores the top building materials that reduce WiFi performance and explains why higher WiFi frequencies, such as 5 GHz and 6 GHz, are even more susceptible to attenuation. We’ll also discuss the implications of placing WiFi access points (APs) in hallways versus classrooms or offices and how this can negatively impact the end-user internet experience.
Top Building Materials That Reduce WiFi Performance
- Metal: Metal is one of the most challenging materials for WiFi signals to penetrate. It is an excellent conductor of electricity and can reflect WiFi signals, leading to weak spots or no WiFi zones. Metal doors, walls, and building infrastructure can significantly reduce or even terminate your WiFi signal1.
- Concrete and Brick: Concrete walls are dense and thick, making it difficult for WiFi signals to pass through. Brick walls also pose a challenge, although to a lesser extent than concrete. The thicker the concrete or brick, the harder it is for the WiFi signal to penetrate2.
- Windows and Glass: While windows and glass might seem transparent to WiFi signals, they can actually reflect or absorb a portion of the signal. This is especially true for Low-E (low-emissivity) windows, which contain a metallic film to reduce energy consumption. This film can interfere with WiFi signals, causing attenuation2.
- Plaster and Drywall: Although plaster and drywall are relatively weak and thin compared to other materials, they can still weaken WiFi signals. The impact is more pronounced when these materials are combined with other obstructive materials like ceramic tiles2.
- Water: Water can absorb WiFi signals, making it a significant barrier. This is particularly relevant in buildings with large water features or aquariums1.
The Impact of Higher WiFi Frequencies
WiFi networks operating at higher frequencies, such as 5 GHz and 6 GHz (used by WiFi 6E and WiFi 7), offer higher data rates and lower latency. However, these higher-frequency signals have shorter wavelengths, making them more susceptible to attenuation when they encounter obstacles like walls and windows. This means that the signal strength and coverage are significantly reduced when these frequencies pass through materials like concrete, brick, and metal1.
The Problem with Hallway Placement of WiFi Access Points
To save money, some schools and offices place WiFi access points in hallways rather than inside classrooms or offices. While this might have worked back in the days of older WiFi operating at the 2.4 Ghz frequency and seems like a cost-effective solution, it can lead to several issues with higher frequency WiFi such as WiFi 6e and WiFi 7.
- Signal Attenuation: As mentioned earlier, higher-frequency signals are more susceptible to attenuation. When APs are placed in hallways, the signal must pass through multiple walls to reach the devices inside classrooms or offices. This results in a weaker signal and reduced performance1.
- Lower Frequency Connections: Due to the attenuation problems at 5 GHz and 6 GHz, client devices often connect at lower frequencies such as 2.4 GHz. While 2.4 GHz signals have a longer range and better penetration, they offer lower data rates and are more prone to interference. This negatively impacts the end-user internet experience, leading to slower speeds and higher latency1.
- Interference: Placing APs in hallways can lead to interference from multiple APs trying to cover adjacent rooms. This interference can degrade the performance of the wireless network, causing connectivity issues and reduced data rates1.
Conclusion
To ensure optimal WiFi performance, it is crucial to consider the impact of building materials on signal strength and coverage. Higher-frequency WiFi signals, such as those used by WiFi 6E and WiFi 7, are more susceptible to attenuation, making it essential to place access points strategically. By placing APs inside classrooms or offices, schools and businesses can overcome the challenges posed by building materials and provide a superior wireless experience for all users.
1: These 7 Materials Can Block Wi-Fi Signal (& What You Can Do About It)
2: 10 Most Common Materials that Block WiFi Signals | HighSpeedOptions
