The liner coming down the old chimney assuming I could get past my damper door which I think mine is pretty wide and can likely accommodate a 6" or 7" liner (I'd have to check). But by either removing it or keeping it open what would I put if anything in that space void? I'd suspect that you would loose a lot of heat up the old chimney. I've seen some guys on Youtube use Roxul and even cement board. Do they have some type of seal kit or sometime? Also on the top of the chimney where the liner goes down the gaps around liner are they sealed off. Am thinking that cold air would come down those gaps or is that not really an issue? Sorry for all the questions and threads lately trying to wrap the brain around it all. Would really love to put a insert in I've got the itch especially when they are calling for a low of 14 tonight.....!
Most of us have a block-off plate where the old damper was. In my case I removed the damper, cut a little of the damper frame out to get the liner in, then stuffed roxul up & around the liner for a good seal. After that I used four pieces of sheet metal to form the block-off plate. Two had the curve of the liner cut out, the other two were rectangles. Worked the pieces in, slid them so they covered the opening and overlapped, then used sheet-metal screws in the overlap to lock the pieces in place. At the top of the flue I stuffed roxul down to insulate up to the heated area of the house. I have an internal flue so I only insulated above the room ceilings. This also created a seal to prevent hot air from escaping out the top. Then I put the cap on and sealed it with silicon. If you have an external flue you should consider insulating the full length. KaptJaq
Thanks KaptJaq! So at the top the gaps around the lining you shoved Roxul down on the sides of the lining to prevent that cold air coming down?
The seal at the top prevents hot air from rising out and keeps the flue warmer. When the stove is not running it will prevent cold air from traveling down between the original flue and the liner. Do you have an internal or external chimney? KaptJaq
Ahh gotcha.....! Looking at kits and pic's now of them so I get a visual makes sense. I have an internal chimney......That liner is pretty $$ eeks...lol!
Dumb question! Tried to answer it myself online but couldn't figure out. Looks like my chimney has to terracotta flues at the top. Trying to find a pic of my house now but it's very wide at the top and looks almost like two rain caps. Kinda like attached!
There are probably two flues in your chimney, one for the fireplace and usually one for your heat/hot water boiler/furnace or any other fuel burning device in your home. There should only be one device per flue but there can be several flues in a chimney. My chimney has 3 flues. At the top they are about 6 inches apart. The tops of the three caps almost touch each other. From the ground it looks like one large cap. KaptJaq
Has anyone had to use an oval liner to get past the damper? Are there any pro's o con's to doing this vs. trying to break out the damper or cutting it?
