Is there any point in topping up pre existing 200mm rock wool in half the attic as the other half is floored? Will the heat from all over the house escape through the less insulated floored part?
Is there any point in topping up pre existing 200mm rock wool in half the attic as the other half is floored? Will the heat from all over the house escape through the less insulated floored part?
the extra insulation over the partial area will only slow the rate of heat loss in that area, but that trapped heat will be drawn to the less well insulated area... basic laws of physics demand it.
you could think about using a product such as this on the floored part:
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