Has anyone made a block off plate using wire mesh to fit the damper opening and then skim coating it with sort of mortar or cement? I've seen a few examples are seems like an interesting concept. What are your thoughts?
thanks!
thanks!
Why not just use cement board, I used Durock, a lot easier to work with.
Did you use Durock or Hardieboard? Is Durock "dustier" to work with?I used caulk around the outside, and high temp silicone around the liner. Cut it tight, and it will stay in place to caulk it. I also propped it up with a couple of 2x8 until it dried.
A flange could be made of angle metal. FWIW, it's usually easier to make a template first, then cut the plate out of sheet metal with an extra 1" border around it that gets folded down to form the fastening flange.how did you secure the cement board to stay in place? meaning, with a lack of a "flange" of some sort to screw into the wall.
Thank you for the suggestion - do you see any issues using cement board? Will it be able to handle the heat, etc?=A flange could be made of angle metal. FWIW, it's usually easier to make a template first, then cut the plate out of sheet metal with an extra 1" border around it that gets folded down to form the fastening flange.
Ideally, a block off plate should be made out of stainless steel, correct?As long as it's non-combustible it should be fine. Note that some cement board uses cellulose as a filler and another uses styrofoam pellets so be sure it is either pure cement board or uses a filler like pumice that is non-combustible.
Sheet steel or aluminum would also work. The point of contact with the liner is minimal.Ideally, a block off plate should be made out of stainless steel, correct?
I'm having issues finding stainless steel sheet metal - any suggestions?Mine are both galvanized perf angle, fastened into the masonry with Tapcons, and stainless panels set into them and fastened with sheet metal screws. My chimneys are granite and field stone, with natural mud (not a euphemism) bedding mortar, and 240 year old lime (no Portland) pointing and daubing. If I can properly fasten angle into mine, you have no excuse for short cutting this.
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McMaster Carr. Or just buy galvanized at Lowes Depot.
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Hey Begreen...just had the dealer install my block off plate about two months ago in preparation for this burning season. They did a nice job and used a fairly heavy gauge aluminum sheet metal and adhered an insulation blanket (kaowool) on top it. So in your opinion...no problem with them using aluminum for the block off plate? I only ask because everyone on this site tends to use regular sheet metal?Sheet steel or aluminum would also work. The point of contact with the liner is minimal.
No problem with it. It wont get enough heat to hurt it.So in your opinion...no problem with them using aluminum for the block off plate?
Thanks bholler...that's basically what the dealer said when I asked about the aluminum. But since they were the ones who told me a year ago (at the time of install) that I absolutely did NOT need a block off plate...I wanted to get some feedback from the experts on this siteNo problem with it. It wont get enough heat to hurt it.