Shielding can be effective but requires proper understanding and installation.
Shielding Materials
Paints: Contain conductive particles (silver, copper, nickel). Apply to walls/ceilings, then overpaint.
Window Films: Sputtered metal layers on transparent film. Blocks RF while remaining optically clear.
Fabrics: Woven with metallic threads. Used for curtains, canopies, clothing.
Installation Principles
Shielding must be continuous like a Faraday cage. Gaps, cracks, or unshielded penetrations compromise effectiveness. Proper grounding is essential—ungrounded shields can actually increase exposure.
Frequency Dependence
Materials have different effectiveness across frequencies. A paint blocking Wi-Fi may not affect power-line magnetic fields. Select materials based on measured frequency concerns.
When to Shield
Shielding is best for strong external sources beyond your control (towers, neighbors' WiFi). First try simpler measures: remove sources, increase distance, reduce duration. Use professional measurement before and after installation.