makie

No, the regulation is that the ridge tiles must be mechanically fixed. You can bed the ridges as long as you also have a screw in each ridge tile.

The kick up is due to the lead and is unavoidable with those thin cement-fibre slates.

Hammer fixings are normally what I see used on jobs. https://www.screwfix.com/c/screws-nails-fixings/hammer-fixings/cat840070?cm_sp=managedredirect-_-screwsfixings-_-hammerfixings#_=p

If it's only started since the work was done next door I'm willing to bet they stood on your roof and caused this.

That's the union you can see, not the membrane.

Those Rosemarys are on a 6 month waiting list right now, not practical if you really need the roof done. The join is also no more likely to leak than any other section of the roof, if done correctly.

Contact the site agent and inform them about it so they have a record before the habitation is done. The cut ridges are also smaller than allowed by NHBC.

We are using the Marley solofix clips.

The tiles are really good to use, I'm doing a site with them just now and plan on using them on private jobs from now on.

Why should we do breakdowns though? We price as we feel necessary, if you don't like the price then just ask someone else. Like @Russell griffiths has said, there is more to think about in a job than just labour and materials.

Also if I ever get asked for a breakdown of costs I tell them to take it or leave it. I don't need to justify prices to anyone. You either like it or don't.

Get some more quotes if you're not happy with them.

Checkatrade is the problem here.... any idiot can sign up and claim to be a roofer. I genuinely have zero sympathy for people that get caught out while using these sites. Word of mouth is the best way to find someone, ask around local roofing merchants/well known builders and they will tell you who they would recommend. Ask someone you know who has had work done previously. Also when you say takes longer and costs more, that will all be factored into a quote or estimate by a professional.

You can just cut a tile in half and have a perfect half bond.

Is the builder doing the roof themselves?

You can get this from doing a 1 day course so it means nothing. Also firestone is not the only brand of EPDM, they could have used something else.

No. (I'm a roofer)

Not if done and maintained correctly.....

Hate to tell you mate but that's frowned upon by most roofers. They should have clipped the top corners of the two slates above the iron and then single nailed them to allow them to swing. That way the slate where the iron was can be double nailed and then the two above can be both glued and have a single nail.

If you have seen someone slate on battens and they have put the slate to the top of the batten, they have either done the roof wrong or put double the amount of battens on the roof.

Don't add a copper rivet, these are made for cement fibre slates. This is the English method for slating also so even in Scotland you wouldn't have seen it. Hell I've been roofing for 14 years and only just done my first slate on battens a month ago. They go to roughly the middle of the batten and then that leaves the top half for the nail from the next slate.

Wear them, I need to do blood tests every year to work with lead on sites.

65mm is the minimum up-stand for any lead, you can do more if you want to. 150mm wide code 4 is still fine as long as you stick to the 1.5m max lengths. Make sure your soakers are code 3 so it doesn't cause any obvious uplift under your slates.

Flat roofs should always be done with 18mm thick wood. If I ever turned up to a job and it wasn't done with 18mm I would walk away.

Nearly every site I work on supplies nails and it's always paslode. https://www.screwfix.com/p/paslode-galvanised-plus-im360-collated-nails-2-8-x-63mm-3300-pack/502fv tends to be the ones supplied and as you can see they don't match BS exactly. The BS isn't required by law so most people don't follow it exactly. In regards to the merchants, when we get galvanised nails from them it tends to be these - https://www.burtonroofing.co.uk/galvanised-nails-65mm-x-2-65g-x-25kg.html