Walls, microwaves, and weather: What really blocks your WiFi signal?

If you find yourself constantly struggling to get a strong WiFi signal, there might be something blocking it – like a certain material. But what are the true causes and reasons WiFi signals get blocked?

There are a lot of myths, but we can help unlock the mysteries with a list of materials and common objects that might interfere with your WiFi.

Let’s make sure it’s not something else first. Take your router and:

• Place it in a central spot so the signal can spread out evenly
• Keep it away from other electronics, thick walls, or metal
• Position the router antennas upright and pointed towards empty space

Once you've done this, you can check your WiFi signal strength. Let’s explore what can interfere with your internet signal, including materials and other objects.

Materials that block WiFi signal

Some sneaky materials are huge signal blockers you might not have thought about. Watch out for these everyday materials that might interfere with your WiFi:

• Concrete: Thick concrete walls and ceilings can  reduce your WiFi signal.
• Metal: Doors and panels can be signal-blocking, especially if they’re dense.
• Brick: Even if they look great, brick walls and fireplaces might block your WiFi!
• Water: Large aquariums, water tanks, and boilers can easily dampen your signal.
• Mirrors: Even tiny mirrors can reflect WiFi waves away from where you want them.
• Glass: Thick window glass or glazing with metallic coatings can block WiFi signal.
• Plasterboard: Dense, insulated walls, like ones with metal inside, may block signal.
• Furniture: Sofas, glass tables, and plush chairs can often become signal snuffers.
• Insulation: Foam or fibreglass may help keep you warm–but can also block WiFi.

For some science on the matter, a report from the U.S.-based National Institute of Standards and Technology covers many materials from concrete to plywood.

If these materials are around, Mesh WiFi systems can help by pushing signals seamlessly around obstacles and make weak signal a thing of the past. Our unbeatable Premium WiFi service uses Mesh WiFi to guarantee signals in the rooms that matter most – making us London’s fastest option. 

Objects and things that can block WiFi signal

There may be everyday objects in your midst that also block signal. Here are some WiFi signal blockers that could be ruining the speed and reliability of your internet:

• Microwaves: These emit electromagnetic waves in a similar range as WiFi signals.
• Cordless phones: Some models mess with the WiFi signals, giving you a blockage.
• Baby monitors: They’re essential but may use frequencies that block your WiFi.
• Bluetooth devices: Speakers, headphones, or keyboards, can interfere with WiFi.
• LED bulbs: Low-quality bulbs might create electromagnetic interference.
• TV antennas: Big antennas near your router can often play the role of WiFi barrier.
• Metal appliances: Fridges or washing machines can reflect or absorb WiFi signals.
• Bookshelves: Thick layers of paper, and the shelf itself, can easily block your WiFi.
• Pet enclosures: Like dog crates, hamster cages, or anything using metal wires.

If you have any of these, try moving them and your router around to find the best path for your WiFi. When it comes to your router itself, look for service providers who provide suitable routers that can handle the internet speeds you require.

Myth vs fact: What does and doesn’t block your WiFi

WiFi signals use a radio frequency range, so things that also use this range that will interfere with your internet connection or cause blockages.

With that in mind, let's myth-bust common misconceptions about WiFi and boosting your signal:

How to guarantee a better WiFi signal

Thick, dense materials like concrete can block WiFi signals, as well as certain objects that use the same frequencies. Router placement can help avoid interference and blockages.

If you live in London, Surrey, or Sussex, check your postcode to see broadband availability in your area. Keep up to date with our blog for more news, tips, and updates on WiFi, signal, and other topics.