How should i go about filling this gap?the fitter put foam in and said to plaster straight to that and to pva the part of lintel that is visible beforhand,it is 25mm wide and about 20mm deep and looks like the foam is across the gap between the inner and outer bricks which has a layer of bitumen felt between them,should i cut back some foam and then building sand render then plaster or build up the plaster.
edit the 20mm depth is with a knife blade pushed into the foam.
edit2,have some offcuts of Recticel insulating board that could be used on the sides with the foil against the cavity once foam removed.
edit the 20mm depth is with a knife blade pushed into the foam.
edit2,have some offcuts of Recticel insulating board that could be used on the sides with the foil against the cavity once foam removed.
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