Foundation drainage mat (dimpleboard) not required?
I am considering using mineral wool rigid insulation below grade on outside of the foundation wall. It would be exterior of the concrete wall, ICF form, waterproofing layer.
Because mineral wool drains, I wasn’t sure if dimple board (drainage mat) is needed and if it is, whether it sits in the foundation wall assembly.
Appreciate any advice on this, and also whether a piece of rigid insulation needs to be used as a ‘roof’ for the weeping tile.
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