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I cannot find anything that distinguishes damp (or exterior) walls from dry internal walls.According to some Google sources, a 4" concrete wall should attenuate a 2.4GHz signal by at least 16dB.
I suspect it is down to moisture content, and the blocks being aerated (~1/3rd the density of solid concrete).The nearest figure I have seen browsing the internet is 11dB attenuation for an 8-inch concrete block with hollow cavities inside at 2GHz. I would expect more than this for 8-inches of block with no internal cavity at 2.4GHz. So I'm still puzzled.
Internal dividing walls between semi-detached houses in the UK such as you show in the plan are often only single-brick thickness - one block.
So something like equivalent to 33mm of very dry concrete?
So, are you sayingWell, I've owned a detached for 25 years now so have way of testing anything - but I do know for a fact that the brick-built Semi I had previously had a single brick wall between the two sides - I accidentally knocked a brick out of place while chiselling out for a socket backing box.... Luckily I was on good terms with the old couple next door!
Quick google - these are standard strength aerated concrete blocks; at 100mm & up, they are rated for "Load-bearing single-leaf walls" - so fact not daft.
(There is also a high strength version with twice the load rating).
It does mention thickness & sound attenuation - I'd guess that's part of the building regs, so now thicker walls between semis?
If your blocks are flat, then, as they are around 1/3rd the density of solid concrete, the attenuation (not structural strength) should be equivalent to ~66mm dry concrete.
Sorry, but this is just daft. If a wall was made of brick only 33mm (1.3 inches) thick, you could probably put your boot through it! As I already mentioned this is a two-story semi-detached house, so the dividing wall between the two houses is quite high (at least 16 feet at its lowest point - higher at the roof apex) and quite thick (8-inches or more). The masonry blocks (not bricks) are laid on the flat, accounting for the 8-inch wall thickness. I can see the wall construction in the attic, where the wall is not plastered.
It would be great if somebody else living in a semi-detached house could measure their own and their next-door neighbours WiFi signal strength and post it here. Some people may be concerned about long term exposure to WiFi signals, not realizing how much their neighbours are contributing.
A: No.So, are you saying