Materials List Revisited

[Glenn Woodward]

I believe the wall insulation is coming from the gap material, noted as insulation gap. If you change this material wall insulation changes accordingly.

Gerry,

Thanks for the confirmation on the slab quantity.

I still maintain that the insulation is coming from the walls main layer.
I can draw the cavity brick wall with a water material for the cavity and the ML gives me bricks for both wall skins, the water in the cavity AND the wall insulation.
Even your attached plan is giving wall insulation because there is only 1 wall layer, which is the main layer and hence automatically generating the insulation.
Can you post a plan that doesn't show any insulation for the wall?