Flue block removal

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Hi, just stumbled across this forum while looking for an answer regarding removal of flue blocks. I own a new build house with a pre-fabricated flue block chimney, i am in the process of opening up the fireplace to have a woodburner fitted, i need to remove about 1 metre high of flue blocks and put a lintel in but im worried that when i remove the lower blocks the remaining blocks will come tumbling down. I would hope they are tied in with the brick / blockwork but would like some guidance before i start. Thanks in advance. Dave


 
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You cannot use a wood burner.

Those are flue blocks are suitable only for some types of GAS fires.
They must not be used on a wood burning or multi fuel
appliance under any circumstance. The concrete blocks have an
integral narrow rectangular flue way. They are of the same modular
size as a masonry building block and are usually designed so that
they bond into adjacent brick or block work.
So unless you want to rebuild your house, forget it.

Look it up at HETAS.

The one you have should also not be approved for gas, as-is, because there are "snots" (mortar protrusions) sticking out into the flue-way which cause a build-up of obstructive material. They should have been been cleaned off when the flue was being built into the house. They might "sweep" off adequately if suitable equipment is used.
Whichever professional instals anything will have to inspect thoroughly.
 
Last edited by a moderator:
Cheers Justin, were not using these blocks for the woodburner, i need to remove them up to about a metre as were creating an opening for it to sit in, we are having an external stainless flue. Just need to know if they upper blocks will all come falling down if they are not supported by the lower flue blocks. I will put a lintel in to support them when we get the lower ones removed.
 
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Got the blocks out that i needed to, need to get a lintel put in now, think im going to let the fire company do the rest. Hopefully what ive done will save me a bit off the £700 quoted price to deepen the fireplace.

 

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