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The pic above (excuse the coloring - digi camera error) is of a wall underneath a window that a double-glazing firm buggered up on installing the window.
Could someone please tell me:
1) What type of wall is this? Is it plasterboard? There appears to be a thin layer of what appears to be plaster or plasterboard (it's quite cardboardy)over a greyish block (this block crumbles if you attack it with a screwdriver). The house was built in the mid eighties, if that helps.
2) What type of filler would be best to repair this?
3) Is it a concern that this "crumbly block" has cracked due to the window installation?
We've just moved into this house and this is the first time I've seen anything other tahn the normal plasterboard on wooden battens.
Many Thanks for all help provided !!!