A sheet metal blockoff plate is the biggest thing, but Kaowool behind the insert can also be a BIG help, if you have an exterior chimney or other construction where the heat radiated out the back side of the chimney won't be useful.Rockey said:Good idea or bad idea? I figured that it would keep the heat from being absorbed by the back of the hearth and transfered right outside. Will this help any?
I bought 25' of Kaowool on ebay it is rated up to 2300 degrees. I don't know if Lowes or Home Depot sells it just make sure it is a high temp rated ceramic product. i paid $47.00 with shipping for mine.It is also known as ceramic blanket and it worked great.karl said:Where can you get kaowool or something similar? Would I be able to find it locally? Like at Lowe's or Home Depot? What about other smaller stores? What would I like for.
Is rockwool the same thing? Or atleast usable too?
Past discussion has varied, probably alot depends on the exact nature of the stuff, it comes in different forms ranging from a fairly stiff board to a fiberglass like bat... The big issue is mostly to hold it in place long enough to get the insert into place, as once the insert's installed, the Kaowool isn't going anyplace.Stevebass4 said:how do you guys mount the Kaowool to the fireplace itself? some sort of high temp adhesive? or did you tapcon it in place?
Not sure... I know they make a "Kaptan" tape (unsure of the spelling) that is used in electronics to mask circuit boards going through a wave solder machine, but I have no idea if that would be useable for this application. They also make high temperature tape that is used in pellet stove installs, but I don't know if it has a high enough temp rating to be useful / safe.... I'd be looking through McMaster's catalog in the same area as the insulation was to see if they list any kind of tape suitable for use with it....Stevebass4 said:Thanks just ordered two sheets of 2*4*1inch stuff from McMaster Car though work and i'm pretty sure it's fiberglass like bat stuff.. so the plan is to line the inside of the brick (exterior chimney) with the stuff - and then slide the insert back in - wonder if they sell high temp duck tape stuff
Well, the blockoff plate is good, but IMHO direct connects are problematic at best. Insulating the fireplace will help keep you from loosing heat out the back for sure, but replacing that direct connect with a full length liner will probably improve your performance, and make future maintainance a LOT easier...Stevebass4 said:Thanks again for your help Goose!
i already have a block off plate and i use a "direct connect" for my insert (goes about 6 feet into the terra cotta flue) but the plan is to use the Kaowool on the sides and back of the fireplace and then slide the insert back in
my exterior chimeny is in fine shape but there is a crack that runs to the smoke shelf - so i figure if i insualte the fireplace before i stick the insert back in - i wont lose any heat from the crack and to the outside brick
US Codes do technically allow direct connects, My understanding is that the Canadians don't, and I tend to think they have more practical experience as to what works best...Stevebass4 said:1) i agree a full liner would be better BUT when this QF 2100i was sold all that was needed was a direct connect and i've been running it for two years now
That's doing pretty good, but I'd bet a liner would take half or less than that, other than the time it takes to dig out and setup all the tools...1a) yup i have to remove everything to clean the direct connect pipe, the stove and the terra cotta flue tires sure it's a PIA but it only takes about 2 hours
Pretty sure that's well over the "OK size" for an outside chimney - a 6" diameter stove pipe is about 30sq" in cross section, a 12" x 8" tile is about 96sq", or about 3x the area2 i think my flue tiles are like 12*8
Sort of, and obviously the chimney guy has seen it, while I haven't, but it still doesn't sound good to me...3) the chimeny has been checked and they fireplace guy said it was everything fine :shrug: there is no crack in the chimney section where the flue is (if this makes sence)
If you see Elk say hi for me! I'm willing to bet that he will say about the same thing that I just did - a good bit of what I've learned on these forums came from his advice, I just try to put it a bit more diplomatically. :coolgrin:4) great thanks for the info - i wont put the stuff above the block off plate
maybe i should ask elk to come by and have a look one of these days