Rainwater possibly entering air brick

[ScottishGasMan]

Uploaded pics from iPhone so apologies for sideways photos

Framing bedroom wall for insulation and plaster board.

Soil under floor boards is a bit damp, so opened floor to check air brick, which was blocked solid and has been for years, cleared out with rubble Hoover, but wandering what the chances are that rain water/dirt etc is getting washed down there from street level air brick as shown?

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[kazuya]

if the air brick was blocked solid then nothing was getting washed into it, the air brick is to stop the under the floor from getting damp and rotting your joists, so the fact it was blocked is probably why its damp

 

[ree]

The air brick needs to be kept open even if water from the external surface is entering - the external surface has, at some time, been raised.
If the blockage was slushlike then it came from the exterior.

You should have air bricks at 2m intervals around your property?

The end of the joist in the pics is probably rotted and other joist tails along that wall are most likely in the same state.

Perching the joist on a loose brick is not best practice - there should also be a bit of DPC under each joist tail.

Some of the flooring is showing signs of wet rot, probably due to a lack of thro ventilation, and touching the damp wall. Do you have a circular saw to cut the floor boards - drilling and ripping them out is not the way to go.

You have penetrating damp and/or rising damp in the wall in the pics.

Research on here for how to do bolt-ons & how to deal with damp walls - FWIW: follow my posts on these issues.