Very knowledgable. Jim Duda came to my home to do a camera inspection and clean my chimney in my recently purchased home. In the process he found a few other things which needed to be taken care of with the chimney (of course because the house and chimney is old and my home inspector did notice one major item) but he listed them in order of necessity and what approximate time frame I should get them taken care of. He was very knowledgeable and was excellent at explaining what work was needed and why. I have used their services in the past and plan on using them in the future.
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