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#1
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Insulation I can put up against a furnace flue/B-vent?
I have my furnace exhaust coming up from the basement to my attic.
Currently the B-vent comes into my attic floor from the second floor ceiling with a good-sized triangular cutout around it, sorta like this, looking from the top: (If you aren't viewing in a fixed font, this won't make sense, picture a triangle with a circle inside) /\ / \ / \ / ___ \ / / \ \ / ; ; \ / \___/ \ -------------- A significant draft comes out this triangle into my unheated attic. I'd like to seal it up but am unsure how to proceed. If memory serves, no flammable material can be within 1" of a B-vent. So, could any nonflammable insulation be used to cover the hole and butt up against the pipe? Are there any other issues? Thanks, Max |
#2
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Insulation I can put up against a furnace flue/B-vent?
the furnace exhaust vents into the attic??????!!!!!!!!
or it then goes on through the roof? Mark |
#3
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Insulation I can put up against a furnace flue/B-vent?
Make something out of sheet metal, I was given an insulation piece by a
fireplace repairman that looked like fiberglass for inside my fireplace in a crack, check a fireplace store to use it to fill the gap. |
#4
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Insulation I can put up against a furnace flue/B-vent?
wrote in message oups.com... I have my furnace exhaust coming up from the basement to my attic. Currently the B-vent comes into my attic floor from the second floor ceiling with a good-sized triangular cutout around it, sorta like this, looking from the top: (If you aren't viewing in a fixed font, this won't make sense, picture a triangle with a circle inside) /\ / \ / \ / ___ \ / / \ \ / ; ; \ / \___/ \ -------------- A significant draft comes out this triangle into my unheated attic. I'd like to seal it up but am unsure how to proceed. If memory serves, no flammable material can be within 1" of a B-vent. So, could any nonflammable insulation be used to cover the hole and butt up against the pipe? Are there any other issues? Look up "rockwool". It is an insulation for high temps. Bob |
#5
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Insulation I can put up against a furnace flue/B-vent?
the furnace exhaust vents into the attic??????!!!!!!!!
or it then goes on through the roof? Sorry I wasn't clear. It goes through to the roof and out. |
#6
Posted to alt.home.repair
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Insulation I can put up against a furnace flue/B-vent?
the furnace exhaust vents into the attic??????!!!!!!!!
or it then goes on through the roof? Sorry I wasn't clear. It goes through to the roof and out. |
#7
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Insulation I can put up against a furnace flue/B-vent?
There are a number of fire retardant or resistant materials. Vermiculite is
fireproof and can be filled in voids around a flue pipe. It is a little hard to find though, at least in small quantities. The Schundler co. from NJ is a major distributor and can help you to find some in your area wrote in message oups.com... I have my furnace exhaust coming up from the basement to my attic. Currently the B-vent comes into my attic floor from the second floor ceiling with a good-sized triangular cutout around it, sorta like this, looking from the top: (If you aren't viewing in a fixed font, this won't make sense, picture a triangle with a circle inside) /\ / \ / \ / ___ \ / / \ \ / ; ; \ / \___/ \ -------------- A significant draft comes out this triangle into my unheated attic. I'd like to seal it up but am unsure how to proceed. If memory serves, no flammable material can be within 1" of a B-vent. So, could any nonflammable insulation be used to cover the hole and butt up against the pipe? Are there any other issues? Thanks, Max |
#8
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Insulation I can put up against a furnace flue/B-vent?
"Bob" wrote in message Look up "rockwool". It is an insulation for high temps. I found it at a local lumber yard, FWIW. Bob |
#9
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Insulation I can put up against a furnace flue/B-vent?
I'm a newcomer to this group but I am impressed with the rapid
responses and quality of information passed along. I, too have a problem with my stove. It's a double-wall pipe and cold air is leaking into my hom from the pipe. I've checked the draft and it closes compleyely so I know its not coming in through the stove. I believe the air space between the two walls of the pipe is where the cold air is coming from. When I checked the pipe at the end of the summer I could see some light as I looked down into the pipe. I figured some of the insulation was missing and I was afraid I'd have a tough time finding the right type. I'll try to find the rockwool ASAP. Thanks, Jim |
#11
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Insulation I can put up against a furnace flue/B-vent?
wrote in message oups.com... I have my furnace exhaust coming up from the basement to my attic. Currently the B-vent comes into my attic floor from the second floor ceiling with a good-sized triangular cutout around it, sorta like this, looking from the top: (If you aren't viewing in a fixed font, this won't make sense, picture a triangle with a circle inside) /\ / \ / \ / ___ \ / / \ \ / ; ; \ / \___/ \ -------------- A significant draft comes out this triangle into my unheated attic. I'd like to seal it up but am unsure how to proceed. If memory serves, no flammable material can be within 1" of a B-vent. So, could any nonflammable insulation be used to cover the hole and butt up against the pipe? Are there any other issues? Thanks, Max You are correct about the 1" clearance. While I can't recommend using unfaced fiberglass insulation to insulate this area, I will tell you that unfaced fiberglass insulation will not burn if held in contact with direct flame. What you do with that information is up to you. Best wishes Colbyt |
#12
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Insulation I can put up against a furnace flue/B-vent?
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#13
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Insulation I can put up against a furnace flue/B-vent?
"Colbyt" wrote in message news:4Uqlf.625086 You are correct about the 1" clearance. While I can't recommend using unfaced fiberglass insulation to insulate this area, I will tell you that unfaced fiberglass insulation will not burn if held in contact with direct flame. What you do with that information is up to you. Fiberglass is not reted for these temps. Rockwool is. But the firestop is certainly part of the solution. Bob |
#14
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Insulation I can put up against a furnace flue/B-vent?
replying to marinemiller, Tails wrote:
Rocks all insulation, fire proof. I have it around my gas fireplace exhaust -- for full context, visit https://www.homeownershub.com/mainte...ent-59440-.htm |
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