ok guys, after i come up hungover from Columbus Ohio to see the greatest blowout this saturday, i plan on tackling the rest of my block off plate . from the pics below, you can see i had the right tools for the job. . now, ive listened to many peoples opinions on what to use to cut out the damper frame to fit your pipe through(in my case 7" round) . ignore it all. get yourself an angle grinder , 4.5" or whatever, and get thin cut off blades from the depot for 2$ each(itll only take one and you cant cheap out on these things). get your goggles and cloth mask and away you go! i cut throught the steel frame and brick in about 60 seconds. then , luckily, i had an air hammer chisel and blasted away the remaing sharp chunks of brick. anyways, i just bought 4' of Kaowool (from http://www.anvilfire.com/sales/pages/index.htm) and its 1" thick and 2' wide. heres my question. as you can see below, i have custom cut a block off plate from 30gauge hvac metal, and i have TWO of them to smoosh together. i was thinking, should i put one layer of kaowool like a blanket in between the two riveted pieces of metal like a sandwhich , OR should i lay a layer on top of both sheets of metal, thus the kaowool would be closest to the chimney cap? if thats the case i was wondering how this stuff will stay put on the block off plate. i figure glue will melt. i was DEFINITELY gonna take this stuff called 3M FIREBLOCK (anyone use this?) caulk and put it on the sides and the rest of the wool and line the edges of the metal so no air can creep in on the sides where it meets the brick. the fireblock cault is supposed to expand slightly when fire hits it to seal better, but i think they mean dirt flame. then i was gonna just tack the plate in place to hold it. what you guys think? rivets or a better solution? where to put the wool blanket? thanks in advance!