Insulating Eaves over wall gap?

[grobbarg]

Hi, hope someone can help - we are currently insulating the eaves space in our house, both for sound proofing (next to busy road) and thermal. The house has granite external walls and lath/plaster inner walls with approx. 50mm gap between. At the eaves floor level I've laid Rockwool between joists over and up to the outer edge of the granite wall top, using baffles to keep the insulation away from the soffits and roof boards. This has greatly reduced the noise reverberating down the walls and already noticed 5 DegC increase in temperature at ceiling/wall.

However, I'm wondering if the gap between the walls will remain sufficiently ventilated to prevent condensation build up if insulation is sitting on top?

Any advice greatly appreciated...