An alternative approach could be multi tool round the edges, find the screws and unscrew or cut along rafters and pry off/unscrew where possible. Then set about making good either with the plywood or plasterboard between the rafters.
@Airhead started
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An alternative approach could be multi tool round the edges, find the screws and unscrew or cut along rafters and pry off/unscrew where possible. Then set about making good either with the plywood or plasterboard between the rafters.