I have scoured this site and tried all the suggestions, but nothing seems to work. I have a fairly straight forward model. All spaces are rectangular. Basement and first floor with return plenums. Some of the first floor spaces are full height. I have tried intersecting and then surface matching with:
Extensions->User Scripts->Alter/Add->Intersect Space Geometry The SurfaceMatching toolbar Directly in OpenStudio with Components&Measures->Apply Measure->Envelope->Form-> BCL SurfaceMatching
I've tried every combination of intersecting and SurfaceMatching in SketchUp and even then using BCL SurfaceMatching without intersecting.
Nothing seems to work. I still end up with a lot of unmatched surfaces. It even sometimes flips surface orientation or deletes surfaces all together.
Here is the file before I did any intersect/surface matching: https://drive.google.com/open?id=1Xa7fzGIRjAiSZ5b3AFe3bRc5gCvgndZi
SketchUp Version 17.2.2555 / OpenStudio SketchUp Plug-in Version 2.9.0 / OpenStudio Version 2.9.0