Hi (new to this forum)
I have an asbestos sheet (well it looks like asbestos) that covers a square hole in the garage to house wall, which leads to a void under the staircase, and the concealed downstairs toilet cistern.
This panel now has a snapped off corner, and I probably need to replace it. If it's asbestos, and between the garage and house, I 'assume' its fireproof.
So I need some replacement board/material, that is fireproof.
Original is approx 1M x 1M x 11mm. There are many options on the internet, but as an amateur DIY’er, I wondered if anyone knew of such materals?
It needs to be removable for access, but sealed to remain 'vermin' free
Regards
Tim