In my rather narrow coal cellar I've got an area which has been tiled to provide a utility space - washing machine etc. The tiles are mounted on plasterboard which is fixed to battons on the wall. I have realised rather late in the day that I may have created ventilation problems under the floor of one of the rooms on the ground floor. The void underneath the floor is only about a foot in depth (the cellar itself doesn't extend under that part of the house. On the external wall of that room there is an airbrick at under-floor level. However, I now realise that the flow of air through this void went through the cellar and out of the coalhole, but my new plasterboard is now in the way.
| | Under-floor void | | | | | Tiles and |_____________________________| | plaster | | board -->| | top to | | bottom | | | | | | Cellar | | | |_________________|
There is no brick behind the top eight inches of the plasterboard wall. The remedy seems to be to put a couple of vents into the the top of plasterboard wall to restore the air flow.
Anyway, getting to the point, how can I do this job neatly? To make the ventillation cut-out through the wall I could drill through the tiles and plasterboard at the four corners of the cut-out. But then I would need to saw through the tile and plasterboard to take out the rectangle. Is that possible? Or any other bright ideas?