I own a detached house in the Gard for 1 year. The house was built in 1982. Unfortunately the insulation of the attics lost is mediocre (roof type farmhouse W). I would like to redo the insulation by keeping the old one (rock wool of 7 cm existing, because chimney, thought to leave on a supplement in wool of rock of 200 mm but I saw on the forums which one should not exceed a maximum weight of load, thank you for pointing me.
The density of bulk rock wool or rolls is a maximum of 60kg per m3. For 20 cm thick, extra weight per m2 will be very limited, maximum 12 kg per m2. There is therefore no contraindication to add 20 cm of mineral wool in lost roofs, including with a framework of small farms.
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