Top floor bedroom ceiling water drip drip. No pipes in loft.

twopenny

If you can bear to get in the loft again or persuade someone else to and put paper across the area you think there's a problem.
Then look at it after rain and see if there's a damp patch.

Do you know anyone with a drone? You could film the whole roof and look at it in detail on your computer.
Any ten yr old or teenager you could bribe 😉

jvjack

No drone. Good idea though,  My selfie stick got some pics.  No tiles missing , but is covered in moss. .
Also good idea is paper.  Have that down so next rain might pinpoint it.

twopenny

This was on the news.
https://www.bbc.co.uk/news/articles/c3w965gz8zgo

While it's not exactly relevant it's interesting as I know people who had old homes insulated and moisture ran down the windows.
I had the polystyrene pumped between the bricks under a similar scheme, a lot leaked into the loft and came out of the air bricks.
While it kept the house warm if the heating was on it didn't let the sun warm through the bricks spring and autumn so I had to have the heating on longer 😕 

Moss gathers on roofs more now that we have insulated lofts. It could be worth seeing if it's keeping the tiles damp depending on what sort they are. If it's the same side as the damp.
Have a look at other houses in the area with the same tiles and see if they have the same amount of moss.
It's unlikely to be that as it's common but helps to eliminate things and focus on the most likely.

JuzaMum

My loft had a water pipe that I assume originally went to the water tank. The pipe just looped round and was not obviously visible due to the insulation. It was so well hidden that when we had our roof replaced, it was knocked and started leaking, which was quite dramatic as water got into the electrical circuitry for the lights. I'm not saying you have the same, but it's worth checking if there is not obvious source of external water ingress 

jvjack

@twopenny The bbc on insulation issue just came on main news. I would have missed it if you hadn't mentioned it.  I managed a look at moss on other house roofs and mine has most just on side of leak , i think because mine where the moss is doesnt get the sun much at all.
@juzamum good point. I had tank taken out of loft 3 years ago but was on other side of loft. Can't see any pipes left.
In the leak a month or so ago it would seem to be from the plank at the very top in picture which would be the roof , and water would have drifted down the thicker plank on the left to bedroom ceiling. I think it starts in front of the thick plank going from let to right. Once i can pinpoint it i think i can contact local roofer with detail.

bjorn_toby_wilde

I think you’ve already isolated it to the valley. A roofer should be able to find the issue in a few minutes.

twopenny

You're doing a great job.
Yes, I've noticed that moss or snow that doesn't melt is usually on the same side of houses in a street.
One problem is that with no heating reaching attics tiles stay cold and damp. Especially if they are the lovely clay tiles. I got this problem also when the loft was insulated. It had been dry as a bone until then.

Also with the roof lined you can't see if any tiles are chipped by daylight coming through.

One thing you could do is ask a handyman or some such to check that the insulation doesn't reach right into the eves so it leaves some air circulating.
The companies who did the government work on roof insulation and some who install their own push it right up against the tiles.

I've done my share of crawling round huge old attic in a lovely house. I bought my current bungalow partly on the grounds of it having a spotless well insulated loft 😉

bjorn_toby_wilde

Very unlikely that it was condensation in early September when the night time temperatures were still in double figures.

OP - you probably won’t be able to find the source of the leak from inside because water coming in through or behind a tile or even at the ridge will then travel down the roof underlay until it finds a way in, maybe a couple of metres away from the source.

Do you know a reliable local roofer? If not, try getting some recommendations from friends and neighbours.

jvjack

Yes , thanks. Have sent pics to roofer relation. Also says valley and will take a look at some point as he's away at moment.
Coincidently i googled local roofers 3 days ago and this morning a double A4 brochure from a roofing company was delivered (no stamp)
 

jvjack

Thanks folks , had couple of roofing companies round. Leak coming in from above the top plank as said by others here to be what they call the valley. They saw the water stains in loft. They showed me photos of the valley strip of lead above that plank on roof which is cracked.
So requires scaffolding on mine and neighbours. Neighbour was understanding ( was dreading that)  putting price to 2k. Lovely
Is booked to be done at end of this month.