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I recently built an extension and used dpc with insulation to close the cavity walls around the doors and windows. Doors and windows have been fitted into the holes and reveals insulated with insulated plasterboard before the internal plaster. Doors and windows have had condensation since...

I need to re-render the rear of a large fireplace. The previous rendering, not done by me, cracked and blew with the heat. Is there anything I can put into the new rendering mix to minimise this problem. I have looked at vermiculite boards but this would be over £100 for this size of fireplace...

Hope you can help. I am planning to build a single storey extension to my house and need to lap the new damp proof membrane into the existing dpc of the external course of brick that I am connecting onto. obvoiusly can't rake out the mortar along the full length of the wall or the wall...