Which Building Materials Can Block Wi-Fi Signals?
Are you curious why a part of your home, or even an area just outside the house, has poor Wi-Fi reception? It could be due to the material used for the wall, or other physical barriers that block or weaken Wi-Fi signals.
Worst Signal Loss: Concrete
Concrete, with and without metal reinforcement, is one of the worst building materials for wireless signals to pass through, but masonry block and bricks can also be serious barriers for Wi-Fi.
Least Signal Loss: Plywood and Drywall
Plywood and drywall come close to zero signal loss in tests.
By the Numbers
The numbers in the graphic and the following table are based on the findings in extensive experiments performed by the US National Institute of Standards and Technology.
|Material||Loss in decibel at 5 GHz|
|Concrete (203 mm)||55.1581|
|Brick-faced masonry block||32.6320|
The full report is called “Electromagnetic Signal Attenuation in Construction Materials”, NIST Construction Automation Program Report No. 3.