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Presumably you are using a flat roof material at this pitch - so you do need a flat roof skylight. Pitched roof skylights are not recommended on low pitches because you can't flash around them properly without them leaking, it's not because of the window itself.

The lead flashing to the sides of the chimney is poorly detailed and could allow water to run in under the sides - there should be individual lead soakers for this type of tile (I think they are Redland Stonewolds) It may have been leaking at this point for years but has only shown recently as...

As above, must be re-holed

Those videos give some good advice. I have been working with the maker of those videos for English Heritage, we hope to have one available soon showing Welsh Random Slating, just waiting for the right job to film on! Good luck with the project.

Yes, something like that, although the tails of the second course will be much lower down in reality as they will be double (possibly even triple) lapped. And yes, this method is fine whatever is going on underneath. But it seems extremely labour intensive for something that can never be...

Not sure I'd describe that pile as 'fortunate' personally, think I'd be with the builder on that one and treat it as hardcore! Regarding your questions: 1. Remeber that more than 50% of your time will be taken up in 'not laying' the slates ie, cleaning, sorting into sizes, holing the...

You say you are cladding too, and if I understand right want to know how to finish where the top of the cladded wall meets the gable? I would place a temporary flat board overhanging the gable on the roof slope. Then clad the wall below in shingles cutting snug against the overhanging board...

Yes, my mistake, this would need looking at also. My guess is that either the felt is punctured behind the fascia or the felt ends at the join of the old roof and water is tracking in there.

To get the tiles to run through perfectly you'll need to take your battens off, add another 30mm to counter battens, and re-batten. Sort verges and fascias to suit.

Since the leak is at the eaves and there is nothing obvious going on there and the lead to the stack is dodgy to say the least - then it most likely that the water is finding its way in at the chimney and running down the felt (there will be felt on the newish fibre cement slate roof). The...

The lead apron on the chimney is suspect and isn't pointed / sealed. The cover flashings on the chimney are also suspect - you need to fix all the lead-work around the chimney, water could be getting in here and tracking down the felt until it reaches the the eaves, at this point inexperienced...

Sorry to here of your lead theft. The price of lead is actually going down at the moment. I'm currently working on a house where all the lead ridges, hips and a lead flat roof were stolen, it's not good for our trade as continued theft of lead will inevitably lead to people specifying...

What I meant by 'Randoms 16s down to 12s' was random width slates of varying lengths, 16" being the longest. You would start the roof at the eaves with the longest slates, working down to shortest near the ridge. These days we normally use even nr lengths i.e 16s, 14, 12s etc, but when...

If it were me and I had the budget I'd redo it in small randoms something like 16s down to 12s, peg fixed and top bedded. That would be as original and look great in my opinion. However this would be expensive, especially in labour cost, I reckon the next best option would be small Randoms as...

Wow - interesting old roof, these 'ribbed' roofs are pretty rare now and you may have the conservationists all over this one! This system of vertical ribbing with metal wire and grouting is known as 'Sir Fonio' in North Wales (or 'Anglesey-ing' in English) as it was such a common fix on Anglesey...

I don't see how producing this metal can be more 'green' than using sustainably sourced timber - I can't see any practical advantage of using it unless the cost is significantly lower than timber. Wouldn't fancy fixing it personally, too many snaggy bits Cold bridging could be an issue.

The valley is finished with purpose made valley tiles. I reckon they used the old ones saved from the original roof, which is why they are a different colour - It's most likely that one or two of these are broken causing the leak, they are easy to fix (replace) and less hassle than changing...

If you need inspection/report on this, this is what I do. email: [email protected]

If the 'bump' in the tile is not up against the side of chimney under the lead (which it isn't) then the lead soaker needs to extend over the nearest bump (which it doesn't) so you need to re-do the lead so it extends over that nearest bump to avoid rain getting in. Although you can't see...

Pull the valley tiles out - two or three either side of the lead, replace the lead, replace the tiles, check tile manufacturers sites for detailing. Seal between the lead and the plastic SVP pipe. Job done. Would take less time than writing the above etc. if you haven't got the tools...