log burner chimney through wall question

[olive]

I am putting in another log burner for the coming winter.

To get to the metal lined chimney flue I intend running 15 cm metal tubing vertically up (about a metre) from the log burner then going through the room wall at 45 degrees before putting the tubing up the first floor chimney with a second 45 degree bend.

My question is - Where I go through the lounge wall does that need a metal sleeve i.e. an air gap or is there some sort of heat resistant plaster that can be used to stop masses of cracking? I can live with some cracking. Any suggestions!

olive

[hillybilly]

You can use heat resistant mortar which is called mortero refractario where it passes through the wall. Nice and black in colour.

[country boy]

If it's a stone and clay wall I shouldn't worry at all...what's to burn? Provided there are no joists in the proximity it will only add expense for no reason

[Grouser]

I agree with Country Boy. I have done exactly this with a 150mm. pipe through a clay brick wall and just cemented the flue in with no problem and no cracking, at least so far. However the vertical run before the first bend is three metres.

[spanish_lad]

only 1m away.. i´d use barbecue mortar to put it in with

[olive]

Thanks for the replies. As ever a mine of information.

It is a stone and clay wall , no wood nearby. No worries.