Hi, I am a new home owner. I had the chimney's inspected today, and didn't get good news. I'm used to chimney's being lined with that reddish/orange plate, but mine it just cinder blocks. Additionally, the flues sort of connect into one large flue, and the blocks are stacked like legos. When I put my head in the fireplace and look up, I can see holes on the bottom of some of the overhanging cinderblocks. It looks like the fireplace was used often, and the house is still here, but the chimney inspection guys said I need to cut out the flue and they need to rebuild it all with mortar. Thing is the bottom of these bricks look like they never had mortar to begin with. Help?