Another DIY'er here looking for free advice I'm afraid. Go gentle. . .
Stripped bedroom back ready to dab and board and found an air brick that's patched up with expanding foam (see pic).
1. Can I just blue-grit over this ready for dab and board or should I fill it in better with a piece of board aswell?
2. The other wall has brick, cinder block, and timber underneath old plaster (see pic). Again can I just blue grit over and board on top?
Stripped bedroom back ready to dab and board and found an air brick that's patched up with expanding foam (see pic).
1. Can I just blue-grit over this ready for dab and board or should I fill it in better with a piece of board aswell?
2. The other wall has brick, cinder block, and timber underneath old plaster (see pic). Again can I just blue grit over and board on top?