There has to be LARGE air space gap in-between the insulation and the outer walls(inside the cavity), including an air space gap in-between the insulation and the cavity wall-tie drip-points(which must point downwards in the centre of the cavity). Therefor the air space gap must be more than half the span of the cavity.
There has to be LARGE air space gap in-between the insulation and the outer walls(inside the cavity), including an air space gap in-between the insulation and the cavity wall-tie drip-points(which must point downwards in the centre of the cavity). Therefor the air space gap must be more than half the span of the cavity.