There are a few things that are important if you want quantities of materials to be calculated for your model by using Revit schedules. Firstly, you should consider drawing walls from level to level. That way, you can answer questions like “How much of what paint do I need to purchase for the ground floor level?” This is true not only for paint but also for other materials.
We handle walls in South Africa in a specific way. We do not include the plaster level in the layer definition because we want to dimension the faces of the brick wall layers. Instead, we paint the relevant material onto the wall. You may also split faces to calculate the required areas that you need to paint in different colors or finishes.
However, you should keep an eye on the quantities because the original of wall area the face does not change.

If the face of the wall is painted, then the area of the finish accounts for the split faces. Therefore, it may be an idea, doe instance, to use the default wall material to calculate waterproofing or priming, while the other painted areas can represent the different paints.

Do this with all the quantities you are calculating. Use Revit to calculate them but understand how Revit calculates the values. Otherwise, you may get incorrect values from the schedules. Thankfully we can always export the schedules to Excel to calculate
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