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Old October 22nd, 2014, 01:23 PM
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Default Insulating a homebuilt arch

Hey gang...several questions here so take a stab at any of them.

What are everyone's recommendations for insulating an arch - blanket or board? Is a combination of either a good idea?

In the firebox, is it just fire brick or is the arch lined with blanket/board and then firebricked?

Also, is blanket or board enough to insulate the back portion of the arch where the drop flues are located?

Lastly, is 1" a common thickness for board and blanket?

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Old October 22nd, 2014, 09:08 PM
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I used 2" of high density ceramic insulation throughout. Then I bricked over just the firebox area and up the ramp. I did not brick under the flue pan as there is no need to since you will not be damaging the blanked when loading wood in this area. I like the blanket, easy to cut and install. Tight fit no need for anchors. I would love to insulate the doors though
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Old October 23rd, 2014, 01:51 AM
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Quote:
Originally Posted by RHale View Post
What are everyone's recommendations for insulating an arch - blanket or board? Is a combination of either a good idea?
I used a combination. Board is my preference, and I used it behind my bricks on the walls and ramp of the firebox. Board was used below pan drop flues and sidewalls.
Like this, but I cut my angle iron back 1 inch, and arch board at the firebox top
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In the firebox, is it just fire brick or is the arch lined with blanket/board and then firebricked?
Remember... Brick is a poor insulator! As stated above, I used board on all the sidewalls of the firebox, and brick stops approx 4 inches from top, with only 1 inch of board on all sides. to expose heat to as much area of the pan as possible. I used a combination of blanket and board for my door. 2 inches of blanket, which seal the door under compression. Two inches of board on top of that that extend into the firebox door opening.


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is blanket or board enough to insulate the back portion of the arch where the drop flues are located?
I used 1 inch, and it is fine on mine.

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Lastly, is 1" a common thickness for board and blanket?
I am quite sure it is. I shopped and searched all over the internet. Board can be quite expensive, and in the end, I found Bascoms to be very competitive.
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Last edited by esleighton; October 23rd, 2014 at 02:49 AM.
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Old October 23rd, 2014, 09:06 AM
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Thanks fellas for the good advice and recommendations. Much appreciated!
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Old December 27th, 2014, 09:16 AM
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Would if be bad for the drop flues to be touching the ceramic blanket under the pan or should there be a gap between the pan and the blanket ?
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Old December 27th, 2014, 09:54 AM
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Remember what insulation does it keeps the heat away from things it touches..............................So you don't want to keep the heat away from the pan surface. I would go for 1"
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Old December 27th, 2014, 10:21 AM
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That sounds logical. In my mind I was picturing the least amount of space for the heat to go through but that didn't seem right so I figured one of you guys could help me out! Thanks
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Old December 27th, 2014, 01:02 PM
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Chuck has it right. If the drop flues lay on or even touch the insulation, you are blocking that much bottom pan area from heat. An inch, maybe a tad less. Fire must be able to touch the bottoms of the flues.
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Old December 27th, 2014, 02:22 PM
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Thanks guys!
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Old December 27th, 2014, 09:37 PM
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I used blanket under drop flues and half brick to protect blanket from the flue brush when I brush each morning. Because after a good firing there is enough ash on brick that I don't believe that they are holding much heat.
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