Maximus152
Registered User
- Messages
- 173
It'll be easy to fix the hole in the base, but as you have lost some of the in-fill (most likely vermiculite) from behind the fireback, you really should get that sorted also. That in-fill is there to prevent a chimney fire starting in the void.
The proper builders providers should stock it, larger B&Qs have it at times. I believe you mix it with cement (6:1). Make absolutely sure there are no gaps at the back of the fireplace above the fireback, and that the fireback itself is fully intact.
Use a standard sand/cement mix to repair the base.
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