Polycarb roof

[supersadie]

Hello
I have a polycarb conservatory roof which leaks. I had my chap put silicone along the spars externally but there are still a couple of leaks. I believe there is 'gasket tape' that can be used to seal the joins. Could anyone recommend a brand or comment on the process generally. I thought I might ask an odd job to do it but does it need a specialist?

Also, the 'open' edge used to have some tape along it, which rotted and blew away. Same question about that - which brand/type and is it ok to fix it myself?
Would appreciate some guidance. ..

 

[Mw Roofline]

Silicone won't do it, you need a polymer such as fix all clear. Gasket tapes will be no good. Google t bag tape or polycarbonate breather tape but you'll need to fit a plastic sheet closure over the tape. What thickness is the poly?

 

[supersadie]

Many thanks for this. Can't quite remember what thickness of poly it is. Will have to see. Have found the closures online. Seems counter-intuitive to put plastic over breathable tape. Why would you need both?

 

[Mw Roofline]

Because the tape when exposed to water for a long period of time goes soggy and comes off. The trim keeps it dry and, yes, somehow the air still gets in!

 

[supersadie]

OK so tape and closure..not just closure?

 

[Mw Roofline]

Tape and closure mate