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A masonry house is not a coverage problem, it is a zoning problem. Stop trying to serve the whole building from one radio and start treating each walled-off area as its own zone with its own radio, joined by something that is not air. That reframing is the entire answer.
What is actually in the way
The ordering below is a rule of thumb rather than a measurement — the real figure depends on the exact material, its thickness and its moisture content. Use it to work out which wall to suspect and how pessimistic to be.
Material
Severity for 5 GHz
Notes
Drywall / plasterboard on studs
Minor
Two or three of these are fine
Solid timber
Moderate
Doors and beams cost a little
Brick
Large
One wall is survivable; two is not
Concrete block
Large to severe
Hollow block is better than solid
Stone
Severe
Irregular and thick; also very variable
Poured concrete
Severe
Especially with rebar
Plaster on metal lath
Severe
Looks like ordinary plaster. Common pre-1950s
Foil-backed insulation board
Severe
Common in retrofits. Effectively a metal sheet
Tiled walls with a mesh substrate
Severe
Bathrooms and kitchens
Worst last. The metal entries are the ones people never think of, and they are the most severe.
Scroll the table sideways to see every column.
The pattern worth internalizing: metal is worse than thickness. A thin layer of foil or a fine wire mesh reflects radio far more effectively than a considerably thicker layer of brick absorbs it. That is why some surprisingly thin walls behave as if they were opaque.
Finding out what you have
Measure on both sides of each suspect wall. A drop of ten to twenty decibels crossing one wall identifies it definitively. Method in room-by-room testing.
Knock on it. Hollow and resonant is studwork. Dead and solid is masonry.
Try a magnet on the plaster. If it sticks in a regular pattern of lines, you have metal lath, and the wall is effectively a screen.
Check the building's age. Pre-1950s plaster is often on lath. Post-2000 external walls are often insulated with foil-faced board.
Compare 2.4 to 5 GHz across the wall. If 2.4 gets through and 5 does not at all, that is a normal masonry wall. If neither does, suspect metal.
This usually backfires
No wireless product will get through reinforced concrete or metal lath
Transmit power is legally capped, so no extender, router or mesh node is meaningfully louder than any other. A product that claims to punch through concrete is selling you a marketing claim. The honest options are: go around through a doorway, or go wired. There is no third option and no amount of money creates one.
The three things that do work
Openings. Doorways, archways, stairwells and even a gap above a wall. Radio takes the path of least resistance, so a node positioned in the line of an opening can serve a room whose wall is impenetrable. Free, and the first thing to try.
Coax. If both zones have coax outlets, MoCA is the best answer available — shielded, predictable, gigabit class.
Electrical wiring.Powerline crosses the wall because it never touches the air. An old masonry house often has old wiring, which is where G.hn beats HomePlug.
And of course Ethernet, if you are willing to drill. In a masonry house the drilling is harder but the payoff is larger, because you only need to do it once per zone and the result is permanent.
How to plan a masonry house
Draw the zones. Group rooms that are connected by openings or studwork. Each group is one zone.
One radio per zone. Not one per room, and not one for the house.
Join the zones with something that is not air. Coax first, electrical second, Ethernet if you can.
Put each zone's radio where the zone is, not where the wall is. A node pressed against the masonry wall it cannot cross is wasted.
We do not run a lab. Specifications are the manufacturers'; performance context comes from the independent outlets named in Sources. The scores weigh those inputs against the specific building on this page, and the rubric is printed on every pick so you can disagree with the weighting. What we do and do not assert.
Quick picks
Ranked by our published scoring rubric (beats masonry, setup, throughput, value). Tap any row to jump to the full write-up, or go straight to the retailer from the right-hand column. How we score.
#
Product
Best for
Score
Price
1
Illustrative
goCoax MA2500DShielded coax ignores masonry entirely and delivers gigabit-class throughput. Nothing wireless competes with this.
Scroll the table sideways on a narrow screen. Scores are our editorial assessment from published specifications and independent testing by named outlets — not our own lab results. What we do and do not test.
The picks in full
Illustrative
#1 · The best answer if there is coax
goCoax MA2500D
goCoax · Midrange
Full MoCA 2.5 speed at a fair price — if your house has coax in the rooms you care about, this beats every wireless answer.
Key specifications
Standard
MoCA 2.5
Throughput class
2.5 Gbps
Requires
Existing coax in both rooms
Score 9.1/10
Beats masonry10.0
Setup7.5
Throughput9.5
Value9.0
What it gets right
+Coax is shielded, so unlike powerline it does not care about your wiring's age or noise
+Turns an old cable TV outlet into a gigabit-plus Ethernet port
+The cleanest way to wire mesh backhaul in a house you cannot drill
What to watch for
−You need coax running to both rooms, and it needs to be on the same splitter tree
−Usually needs a MoCA filter at the point of entry to keep the signal in the house
#ad We do not publish a price we cannot verify, so the button opens Amazon's own listing. How we are funded.
Common questions
Does Wi-Fi go through concrete walls?+−
Badly, and through reinforced concrete essentially not at all — the rebar acts as a partial metal grid and reflects the signal. Since transmit power is legally capped, no product is louder than another. Route around the wall through an opening, or go wired with MoCA, powerline or Ethernet.
Which walls block Wi-Fi the most?+−
Anything containing metal: plaster on metal lath, foil-backed insulation board, tiled walls with a mesh substrate, and reinforced concrete. Metal reflects radio rather than absorbing it, so a thin metal layer is worse than a much thicker brick wall.
How do I know if my walls have metal lath?+−
Try a magnet on the plaster. If it sticks in a regular pattern of parallel lines, that is metal lath. It is common in houses built before about 1950 and it looks identical to ordinary plaster from the room side.
What is the best Wi-Fi setup for a brick house?+−
One radio per zone, where a zone is a group of rooms connected by doorways or studwork, with the zones joined by coax, powerline or Ethernet rather than by air. Trying to serve a brick house from one central router is the mistake.
Illustrative
