Hey guys getting ready to install a new liner and Osburn 2400. The liner is 23 ft but I can only get 20 ft of insulation. So do I insulate starting right on top of the insert and be a couple feet short on the top of the liner or go up a couple feet from the insert and have extra on the top before it comes out of the chimney? The liner is double wall.
Liner Insulation ?
- Thread starter Colorado Boy
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oconnor
Minister of Fire
Is the chimney an inside flue or on an outside wall? If inside, make the call based on whether you need the zero clearance protection near the bottom or top. If it's an external flue, I'd bias it to the top. You should be able to find some extra insulation locally. It's 8lb density ceramic wool blanket.
mstoelton
Feeling the Heat
Ok so you will want to install a block-off plate above the lintal of your fireplace as part of this installation. I will not go into the details of why. This can be referenced in other discussions on this forum. You will create a hole in the block-off plate to allow your liner to come through and into your fireplace. The insulation will need to end above the block-off plate so that the bottom end of the liner is bare and comes through the block-off plate. 20 feet of insulation should be ok. You will also need to end the insulation just short of your top-plate connector. The connector clamp on the top plate goes around just the liner. There will not be any room for insulation where the clamp fits around the top of the liner.
Follow these steps:
1. wrap the liner in insulation leaving ~3 inches bare at the top end - be careful some liners are directional and there is a top and bottom.
2. wrap liner as far as the insulation will cover towards bottom.
3. install insulated liner in flue
4. install block-off plate in fireplace
5. ensure enough liner is coming through block-off plate to attach appliance connector to stove properly
6. attach appliance connector
7. set stove and attach to appliance connector (before any work is done to attach the top plate)
8. once the stove is connected and appliance connector is attached to stove and liner with positive connection, then go on roof and finish top plate.
9. only trim length off liner at the top and once the bottom is all connected and ready. Do the top plate work last.
10. If you follow this progression of steps you will not cut the liner too short (unless it was too short before you started).
Having a short un-insulated section at the bottom of the liner should not cause any issues. an un-insulated section at the top of the liner could result in some creosote issues.
Note: most double wall liners are directional (there is a flow direction marked on the liner).
Follow these steps:
1. wrap the liner in insulation leaving ~3 inches bare at the top end - be careful some liners are directional and there is a top and bottom.
2. wrap liner as far as the insulation will cover towards bottom.
3. install insulated liner in flue
4. install block-off plate in fireplace
5. ensure enough liner is coming through block-off plate to attach appliance connector to stove properly
6. attach appliance connector
7. set stove and attach to appliance connector (before any work is done to attach the top plate)
8. once the stove is connected and appliance connector is attached to stove and liner with positive connection, then go on roof and finish top plate.
9. only trim length off liner at the top and once the bottom is all connected and ready. Do the top plate work last.
10. If you follow this progression of steps you will not cut the liner too short (unless it was too short before you started).
Having a short un-insulated section at the bottom of the liner should not cause any issues. an un-insulated section at the top of the liner could result in some creosote issues.
Note: most double wall liners are directional (there is a flow direction marked on the liner).
oconnor
Minister of Fire
Yep replacing old insert with Osburn. I have roxul already for the blockoff plate. I was asking about the liner Insulation, if the liner needs insulated right above the insert or if it's OK not to a couple of feet above the insert since I will be short insulation because the liner is longer than the wrap insulation.
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