Apr 20, 2013 · How to make a block-off plate A block-off plate is particularly helpful with inserts installed in fireplace on exterior walls with exterior chimneys. Without one, the flue liner (which …

Aug 25, 2008 · I've gotten some conflicting advice on which cement to use on an old chimney. I was told that I cannot use just any motar mix for chimney repair because I have an older …

Nov 5, 2006 · the block chimney should have 4" of solid masonry if it is solid chimney block and the motar joints there are good there possibilities for its use. The other part of the equasion it …

Oct 4, 2014 · It's a center masonry chimney with 30' of un-insulated liner to a capped top. The cast iron surround isn't all that tight to the fireplace brick and there was no block off plate …

Oct 10, 2008 · Hi folks, We have a 30 year old external cinder block chimney, that has a couple of cracked bricks and some mortar missing from the joints. It has a stainless liner, for our PE …

Nov 18, 2022 · Lower block off plates (where damper was) help keep more heat in the house where you want it. Exterior masonry chimneys transfer a fair amount of heat to the outdoors, …

Aug 17, 2023 · The chimney consists of hollow concrete chimney blocks that are 17" x 17" with an 8" x 8" clay liner. Need to rebuild top half of the chimney before installing a flexible chimney …

Nov 3, 2007 · A post yesterday guoted a cost of $5000 for a chimney block chimney? Here is a sample of cost a chimney block cost $7.75 ea and is 8" high an 8/8 clay flue 2' long cost $9.20 …

Nov 2, 2015 · Chimney requires 2" clearance to combustibles. So an 8" OD would need a 12" diam. hole. A thimble ensures this clearance is met. For non-combustible wall like concrete or …

Dec 14, 2009 · The block-off plate really seals off your fireplace smoke box and chimney from the rest of your house. It works exceptionally well to keep the heat in your house.