I am new to the profession and seem to have many more questions than answers. Maybe someone can help the new guy. Here are some of my questions: 1. I have been using a mini protimeter to analyze whether a waterstain is active or not, when comparing the difference between the drywood and the waterstained wood I am seeing a very small incremental difference (11 on the stain and 10 on the non-stained area)does this mean the stain is active or is this inconclusive? 2. Does a scuttle hatch door have to be fire rated. 3. Sometimes it is very difficult to tell if a toilet, or sink is vented correctly, is it possible to tell by using a TIF 8800 to measure the sewer gases, and if so where should I adjust the sensitivity to. 4. I recently inspected a house built in the 1800's and was a bit overwhelmed when I went into the basement. It was a granite block foundation with square cut granite on top of round granite boulders, there were air spaces between the joints, spalling boulders, and deteriorating mortar joints. Any ideas on what to suggest to the client? should this be something a contractor of structural engineer should look at. Also the was exposed rigid foam isul. on the ceiling, I believe this to be a fire hazard? so may questions and so little time