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Im in the process of lifting my floors and removing the slag/burnt rock insulation. There is a layer of whitish plaster which I assume is horsehair between the joists. Is this just to keep the slag in or is there some other reason. Ive also got a sickly sweet smell coming from the floor. I guess...

The house I bought has a lowered celing and there is a gap between the original and new ceiling of about a metre. Although the loft is insulated Im losing all my heat into the gap between the two. The lowered ceiling isnt insulated. Does anyone know If I can insulate the lowered ceiling? I can...