So the garage was turned into a bedroom a few decades ago. Weepholes were blocked before a very thin render layer was placed over the brick walls.
Below the old carpet is jusr tiles and soil under that I believe.
Concrete render from ground up 35cm is showing signs of rising damp/ water damage in the form of bubbling and peeling.
My family concreted over the backyard grass and installed a drain on the slope downwards so water shouldn't be pooling under the house as much as when we had a grass backyard.
My question is, if I was to put a gyprock wall and insulation over top of the single brick layers (evened out with the double brick where the pillars are), would there be any health or other issues (eg mould) for the room occupant?
It doesn't currently feel moist but the render is bubbled and peeled up like 35cm from floor in multiple areas of any of the brick walls. May have built up over time and still is, or may have happened during the time we had grass, well before the backyard concrete.
There is already floor to ceiling mould in a corner of the room, where the brick wall meets perpendicular gyprock wall and there is a minor gap that let's a small breeze in. But we intend to knock that wall down to put insulation in and rebuild.
Reason for insulation and gyprock is to reduce thermal transfer and block sounds from outside.
Thanks in advance.