How do I get rid of flashing on roof when I move the model around. see attachment
It could be two things:
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Are there two roofs in the same position? If so, SketchUp does not know which one to show, so it shows both. The flashing you describe is called Z-fighting.
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The Batten/Sheathing thickness is set to zero, and the roof cladding & waterproofing or sheathing are on the same plane, creating Z-fighting. To fix it, you need to add a positive integer to the batten /sheeting thickness. If this is the case, you will know if you turn the tag named 21_roof_waterproof off in the roof tool
. See the images below
