I'm modeling a massive masonry outside wall (600 mm, uncoated) and whenever I have driving rain on, the whole brick layer gets wet rather quickly. This is odd, since I've never encountered abnormally high moisture contents in massive masonry outside walls. Should I add a surface condition with a small Sd-value to the outside surface? Could I even switch off the driving rain altogether? The facade is an old bare brick wall so I think switching off driving rain might be a bit irresponsible...
I've encountered this problem with multiple different bricks (Fraunhofer: Solid brick masonry, Solid brick historical).
When I'm simulating massive masonry outside walls with rendering I have the same issue. The results seem more accurate when driving rain is switched off and when some Sd value is used in the outside surface.
I've enclosed some screenshots.
Could this effect be happening because the brick layer in the model is homogenous and the actual structure may have air pockets, vents etc. in the brick wall? Is there any good way of simulating them? Other than putting air layers in the model of course.
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