Drip from downpipe through roof

[elmag28]

I will be grateful for advice regarding a small drip from the ceiling directly under this downpipe. It can happen in the morning even when no rain possibly due to dew condensation tracking down.
As per the pictures there is water marks below the waste pipe below the joint. Looks like a previous attempt has been made at sealing the lead flashing.
Will bead of CT1 or some thing similar with butyl tape sort it or Google suggest using rubber collar. Will be grateful for some advice.
Thanks

 

[CountryFan]

Looks like a solvent weld fitting, which may not have been done correctly or just failed. CT1 if you want to bodge it.

 

[noseall]

I will be grateful for advice regarding a small drip from the ceiling directly under this downpipe. It can happen in the morning even when no rain possibly due to dew condensation tracking down.
As per the pictures there is water marks below the waste pipe below the joint. Looks like a previous attempt has been made at sealing the lead flashing.
Will bead of CT1 or some thing similar with butyl tape sort it or Google suggest using rubber collar. Will be grateful for some advice.
Thanks

A rubber collar (pitched multi-slate) would have been better. That arrangement requires a glued skirt just above the top of the lead slate upstand.

But it sounds to me like you have other issues?

 

[zanderhomehub]

Before sealing it, I’d inspect from the loft and from ground level only—don’t walk a wet roof. Trace the damp path and photograph the pipe joint, lead flashing and any staining, noting the dates of rain and whether it also appears on dry, dewy mornings. Keep any receipts or warranty paperwork with those photos if the installation is recent. A temporary measure can limit damage, but sealant alone is not a permanent fix; if the entry point remains unclear, the timber or ceiling stays wet, or the damp spreads, get a roofer to inspect and renew the flashing/joint properly.