Which sealant?

[Tiny]

Ive put in a multi fuel stove as it's getting nippy, my question is what sealant do I use to seal from the 5 inch flue to the plate it runs through out the top of the camper.
Would any quality high temp stuff do?, what have you used successfully?
Cheers.

 

[n brown]

there´s no sealant i know of which will do that job. we use these DEKTITE CORRUGATED flat and pitch roof Flashing for STOVE PIPE FLUES | eBay the hole you cut in the rubber is a tight fit on the flue pipe and keeps the weather out

 

[Teutone]

there´s no sealant i know of which will do that job. we use these DEKTITE CORRUGATED flat and pitch roof Flashing for STOVE PIPE FLUES | eBay the hole you cut in the rubber is a tight fit on the flue pipe and keeps the weather out

Would this not work??
Fortafix - High Temperature Sealants and Adhesives. Fire Resistant Sealants. Heat Resistant Cements

 

[n brown]

possibly,but these sealants are all expecting stoves and walls and ceilings to keep still,maybe allowing a little for expansion, so all the ones i´ve seen used.(not that i´ve seen them all of course ) tend to break up after a while, this lets rain in -not good. The OP gave me the impression that he was using a plate with a hole in it,like a register plate. this is just a vastly better plate ,that has sealant on its join to the roof ,but none needed where it seals to the flue

 

[Mullsy]

Mapei Mapeflex Firestop 1200°C High Temperature Sealant Grey 300ml | Fire & Heat Sealants | Screwfix.com

 

[n brown]

again,ideal for the join between flue and stove,and where any components of a cast iron stove are bolted together,but IMO, no use at all for going through the roof and getting a leak proof seal that will stand up to thousands of miles of vibration etc. if only it was that easy

 

[Teutone]

again,ideal for the join between flue and stove,and where any components of a cast iron stove are bolted together,but IMO, no use at all for going through the roof and getting a leak proof seal that will stand up to thousands of miles of vibration etc. if only it was that easy

I looked at the link you posted and I have to agree with you. Heat and vibration together is a touch combination. I would still use a flexible heat resistant silicone under the roof fitting to be belt and braces.

Mastic alone won't be good enough.

Edit: never looked at the flue pipes for these little stoves. Are they single wall or twin wall?

 

[n brown]

it´s not even about the heat really,the flue at 1.5-2 metres height isn´t red hot or anywhere near,but there´s a fair bit of movement. before these silicone flashings came along, we used a flashing made from a bit of bigger tube soldered through a square plate, the flue went though this,then a wide cowl kept the rain out.you can still see these on older canal boats.
the flue can be twin wall, but i prefer single wall

 

[Tiny]

possibly,but these sealants are all expecting stoves and walls and ceilings to keep still,maybe allowing a little for expansion, so all the ones i´ve seen used.(not that i´ve seen them all of course ) tend to break up after a while, this lets rain in -not good. The OP gave me the impression that he was using a plate with a hole in it,like a register plate. this is just a vastly better plate ,that has sealant on its join to the roof ,but none needed where it seals to the flue

Bang on. Many thanks nbrown. I tried some high temp sealant but it wouldn't stay sealed because we're mobile and moving. Have now ordered one of the recommended flashing from Amazon.
Also thanks to all for taking the time to reply.