Blown plaster, cracks and making good
Blown plaster — the kind that sounds hollow when you tap it — is common in Banstead's inter-war and post-war houses, especially on solid external walls and around chimney breasts. The fix is to cut the loose material back to a firm edge, treat the background and patch with bonding and a skim finish so the repair is flush with the surrounding wall. Patching over the top without removing the blown area is how cracks reappear within months.
For cracks, we rake them out and fill them properly rather than smearing filler over the top. Movement cracks around openings and where extensions meet the original house may need scrim tape embedded in the repair to stop them reopening — we will tell you which type yours is when we look.
