Chimney insulation

Postby Big Red » Sun Mar 06, 2011 4:31 pm

We have fitted a wood burning stove and have been told we need to double insulate the flue. We cant fit a doulbe insulated flue liner as we have a bend in the chimney. We need to insulate with polystyrene beads. Where can we get them from and will this work instead of a double insulated liner.
Big Red
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Simply Build It

Postby stoneyboy » Mon Mar 07, 2011 10:39 pm

Big Red,
You need vermiculite not polystyrene beads.
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Postby welsh brickie » Tue Mar 08, 2011 10:07 am

you can also use a company google : thermocrete flue lining
welsh brickie
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Postby wookey » Sat Mar 12, 2011 9:57 am

A bend doesn't normally prevent a flexible liner going down the chimney - just makes it a bit more awkward. Many chimneys have bends and offsets in them.

The choices are:
1) Rigid Pumice liners (will last indefinitely - you need to take out bricks for access at the corner)
2) rubber snake down chimney then pour in concrete (needs a specialist company - they have to take out bricks every two metres, should last forever)
3) flexible stainless liner. (easily DIYable, but will only last a limited time. 10-40 yrs depending how much you spend on liner and how much you use the fire)

Insulation has to be heat-proof so you can use vermiculite or Leca.
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Postby steveo2463 » Mon Mar 14, 2011 3:34 pm

I would use Leca around a flexible liner the other system has to have holes taken out every 1.8m through out your house and is very intrusive. Micafill or vermiculite is very good however this takes time to settle.
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Postby Big Red » Mon Mar 14, 2011 3:44 pm

Thank you everyone for your advice. I do already have a bendy flue liner but it keeps filling at the bottom with horrible brown tar/water stuff.

I now have a new bendy liner but need to know where to get the insulation beads from. Every time I put it in the search box I keep being sent to insulation boards - insulation foam - sheeting etc etc. I know where to get beads to put in my bean bags :lol: Which doesn't help nme a great deal I must say.

So any help with known supplier sites would be a great help.

Big Red
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Joined: Sun Mar 06, 2011 3:40 pm

Postby stoneyboy » Tue Mar 15, 2011 10:50 pm

Big Red,
For vermiculite try contacting your local builder merchant.
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