Best sealant for around a stainless steel wood-burner chimney?

[David001]

Once during the recent winter, when the wind and rain were vicious and rather horizontal, I noticed some drips of water trickle down the outside of the stainless-steel wood-burner vent inside a bedroom.

 

So this summer I intend to get up on the almost flat dormer roof which is close to the stainless-steel chimney and fill any small holes I can find around the vent.

 

I imagine it needs to be something flexible, but also something that won't react badly when the metal is warm (when the fire below is burning).

 

What product should I use, please? 

[Gus Potter]

Post a photo and you'll get loads of ideas.

[Nickfromwales]

2 hours ago, David001 said:

Once during the recent winter, when the wind and rain were vicious and rather horizontal, I noticed some drips of water trickle down the outside of the stainless-steel wood-burner vent inside a bedroom.

 

So this summer I intend to get up on the almost flat dormer roof which is close to the stainless-steel chimney and fill any small holes I can find around the vent.

 

I imagine it needs to be something flexible, but also something that won't react badly when the metal is warm (when the fire below is burning).

 

What product should I use, please? 

WHOA!

 

Please define "vent", and DEFO post some pics before you begin doing anything  

[David001]

@Gus Potter& @Nickfromwales

Thanks for asking for a photo. I hope this one will do.

[Gus Potter]

Good photo. 

 

The localised wind vortices at the ridge and just behind the cylindrical flue pipe are going to be brutal. I would look to see if the water is getting forced up under the ridge and it's nothing to do with the mastic.