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Venting Case Study Raises Questions To the Editor: I have tremendous respect for Henri de Marne. His sessions at the JLC-Live show were informative, thought-provoking, and extremely well presented. But his recent case study on roof moisture problems ("Case Study: Roof Ventilation Retrofit," 6/95) raises more questions for me than it answers. What was the relative humidity inside this house? It appears to have been very high. Was anything done to reduce the amount of moisture generated within the house itself, or were all corrective measures directed solely at trying to vent this excess moisture off through the roof? The ice damming shown in one picture implies that the roof insulation and ceiling airtightening were woefully inadequate. Based on that evidence, could not his