When insulating a loft at ceiling level with mineral wool type material, should the insulation cover the exposed wall cavities for external walls?


Your insulation should cover the top plate of the wall. This gives you a complete thermal envelope. Covering the wall cavities will help keep cold air from coming up to the upper areas.

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  • I agree, but insulation isn't intended to block airflow. (You probably meant heat transfer via conduction.) – isherwood Feb 12 '19 at 15:43

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