Leak caused by log burner

Go back to the Company again and explain that their remedial work did not solve the problem, just because a year has nearly passed is immaterial if their original installation was not acceptable.

Hi we have done that on many occasions now we have also been down to see them but they won’t do anymore They did say that they had sacked the man who installed it. But that doesn’t help me!

If the flue itself is letting rain in, then you need a bigger or better cowl. Even that won't protect against wind driven rain.

As regards rain getting down the side of the flue, where it emerges onto the roof should have a good portion of mortar around it. Because Spanish sand is so coarse, it lets water through, so the mortar needs to be sealed with roof paint or liquid bitumen. That's normally enough to also seal any slight gap between the mortar and the flue, but you can also get heat resistant caulk that you could force into the gap.

Hi cheers for your replies guys we only have a metal flue going straight up through the ceiling,but we have asked a builder to come in and build us a chimney. Hopefully that will help 🙄

We've got a stainless steel flue going straight up through the roof. It pokes up quite a bit and is prevented from moving by stainless steel guy wires. It's only got mortar around it where it comes through the roof tiles, but waterproof paint has so far prevented any leaks.

I had a builder look at the burner and flue he said that it was an internal flue and wasn’t suitable for being above the solarium he also thought it was fitted upside down and the joins would let in water 

If it's just a steel flue, then it will corrode over a few years and need replacing. When that time comes, get a stainless steel flue and that will last forever.

Joints in a flue should ideally be female up and male down, otherwise you can end up with unsightly creosote trickling down the outside of the flue. For a new installation, the joints can be sealed with caulk to prevent water ingress, or left alone and the creosote build-up will in time seal the joints.