Thanks for supplying your sample house file. It is very helpful. My expertise is cabinets but I have been trying to understand sketchup for the purpose of my own house design. Had a question about the structure of the sample house but then thought that perhaps it is not intended as a structurally correct house example of a house that could be built but just as an exercise for seeing how the estimator works? I have been struggling with avoiding the need for a ridge beam in my own design and the need for either, rafter joist, truss system or ridge beam.