Hi, I'm new to this so bear with me if I use the wrong terminology or ask an 'easy' question. We purchased a log home last spring (built in 1989), it has a wood burning stove and previous owners said that it cleaned and inspected before house went on the market (summer 2017). This winter we have been using it on a 'weekend' basis, but have noticed that it leaks a little when it rains heavily. It rained all day yesterday and dripped around the chimney box (we have a type 3 based on https://www.hearth.com/talk/threads/the-basics-on-how-to-install-a-wood-burning-stove.147798/) and about 10pm several pieces of slate fell off of the chimney box due to water intrusion. I believe these are just decorative. On the roof there is a 'tarred' section around the chimney that seems excessively large. I know that I'm going to have to tear that up to get to the leak, but is there a step by step guide on how it is supposed to be when putting it all back together? I have pics and can post if needed. Thanks, Tim