In message , The Natural Philosopher
writes
On 18/12/2020 11:56, Monique Castellani-Kraan wrote:
On Friday, December 18, 2020 at 11:46:56 AM UTC, alan_m wrote:
advice? Photo: https://imgur.com/a/duJgrK5

Photo as usual unviewable on Linux.

A rusty cast iron job.

Fill it all up and cover the wall with plasterboard and celotex dot and
dabbed in place.

https://www.roofingsuperstore.co.uk/...ine-basic-tape
red-edge-wallboard-1200mm-x-2400mm-x-22mm.html

Vents part way up walls here have been installed to meet draught
regulations for chimney vented gas fires. Sleeved so there is no
intended link to any wall cavity.

ISTR mention of this now being used as a bedroom. Clearly changes have
been made and it might aid advice if more were known about the building
history.

The wardrobe/cupboard appears to be a later addition perhaps due to a
change of use.

My experience of fitting a wardrobe to an insulated modern cavity wall
is DON'T DO IT!

Black mould at high level on walls is an indication of too much
atmospheric moisture, too little room ventilation and insufficient heat
input.




--
Tim Lamb