The hearth is 2 inches high. Natural stone slate tile, really Quartzite on ½" (broken link removed to http://www.usg.com/USG_Marketing_Content/usg.com/web_files/Documents/Prod_Data_and_Submittal_Sheets/DrckCement_Board-Submittal_Sheet_CB399.pdf) cement board all on ½" Micore 300 as a base for the hearth. "Combustible flooring must be protected with a covering of noncombustible material with an R-value of 1.2" is needed for the 2004 HearthStone Heritage hearth.bcnu said:" How high is your hearth?"
Talk to your building inspector and see what he wants to see, them a architect or carpenter to see how to do it, I guess. The total weight loads are high on a stove and hearth. Expert help planing is the only safe way to go. Start a Question in The Hearth Room forum those guys have some ideas.bcnu said:"To get a flush hearth what would you have done with floor/subfloor(if old hearth wasn’t there?) "
The stove back is 10 inches to the centre of the connector T vertical vent.bcnu said:" What is the distance from your stove vent to your flue - it looks like your vent pipe is almost at the very back of your stove."