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Flat pitch , short head lap

Are the spots anywhere near the above ridge ? Centre line

The tiles will read a different pitch to the roof .. Ppretty logical really . And irrelevant. The rafter pitch is what you should be interested in . Putting different batten size won't help . Post above is correct if I understand your post.

I've seen cement fibre slates fail in 12 years . There is the Glendyne alternative to Welsh and more economical . There are some decent Spanish too , as long as they are t1 s1,w1 then should be trouble free. Something like a cipa h12 are good and you can get a dite specific guarantee for up...

You have what appears to be the original back gutter and a newer apron . The back gutter should have been replaced looking at the state of it and definitely one piece

It's a poor example . Cut course under the window for one ..

Skill

Not strictly correct ..

As above leads too narrow and badly fitted . It could have had hip tiles bedded as per ridge . I'd be inclined to remove the lead and put a hip tile on. Asbestos slate btw

The lead should have been fully supported . An open valley used . What you see here we've seen many times on preformed grp "dry" valleys . Fitted by others as we don't use them. The sandtoft 2020 is a good tile

He's asking about flashings and wether they are weather tight . Which they are

They would need to move the whole window down a couple of inches , or up 8 approx. It's not going to leak

It can be felted. Probably cheaper than lead with its adaptions . Thr felt shouldn't be laid on top of the lead .

Fwiw the hips are not properly pointed at the but joints .

The problem here is the verge was bedded the pointed in two different mortars . The verge should be pointed in the same mortar used to bed it . Done correctly it will outlive any dry verge

Roof pictures

As above two tiles slipped leaving no head lap is a leak. Also the mortar that has been jammed here and there can dam water and cause a leak. Imo grp is for boats . To get the correct fall you'll need to adjust the gutter soles . You be better off getting a good felt flat roofer in the torch on...

Looking closer , the weep hole still has a bit of the brickwork bed blocking it . This can cause a dam effect and any build up of water could drip over the inside tray turn up . If it's low

Looks like a Redland plain tile . The vent looks like an aftermarket vent . Could one of a few

Fluff sandwiched between plasterboard and felt . Isn't correct . You should have at least a 50 mm air flow gap between the felt and insulation . Soffit or ofv should be there and some form of venting at high level depending on roof design . Curious as to which Marley tile is no longer made . Do...