Is this roof work correct?

[Biologyman]

I'm having an extension rebuilt and the builders have done this roof work. I have a few questions;

1. they have cut all the corners off the double romans - why?
2. The tiles don't seem to be lying flat in all areas - is this unacceptable?
3. Are the cuts around the Velux windows ok?
4. What's going on with the lead skirt around the flue. Why not just buy a new lead flue skirt instead of patching it up?

Obviously I need to get this right. I don't want any shoddy work. what are your opinions?

Any help very gratefully received before I speak to the builders again tomorrow morning.

Major thanks.

Biologyman

 

[noseall]

1. they have cut all the corners off the double romans - why?

Christ knows! Clay interlocking tiles are not renowned for their neatness but more worrying is why they have cut the corners off. Bizarre. They look to have cut the corresponding opposite corner on the each tile sat above i.e. bottom left and top right.
Bonkers.

 

[chappers]

That's the correct way to lay pantiles. bottom left and top right of the underlying tile is mitred so they butt together, that way the flat parts of the tiles lay nicely on top of each other, otherwise you would have a double thickness at the dome where the tiles lap and this would lift the flat part of the tile.
This isn't necessary on modern concrete interlocking tiles which have a thinned gutter profile.
However your concerns are well founded that roof is an ******* abortion.
Laying pantiles is an art as there is often a slight variation in the tiles sizes and selecting ones of a correct width is all part of the game to get the domes to match up nicely.
Also the mitres should be cut as you go to allow for variations in the length/width or else you lay several courses out on the floor and measure the total and take an average, they should butt up closely and should be cut at such an angle so the length of cut is close to the size of the head lap and side lap. a lot of yours seem to be cut at too shallow an angle and therefore may not be weathered sufficiently, especially from driving rain.
The uncut right hand bottom of the tile above should cover most if not all of the mitred cut.

The flashing around the flue is indeed a mess why is it made up of so many different pieces of lead, the lead on the flue flashing should be sufficient to weather it and if it needs extending it should have a separate piece of lead burned to it.
In your last picture the bottom three tiles are not turned over into the flashing they should have been cut off at the bottom of the dome not the top, it also looks like some of the tiles are of a different profile.
There are always some gaps with pantiles and they can be a bugger for cutting openings such as rooflights in as they need careful planning, the best method would be to gauge the tiles out with chalk lines on the battens and use that to decide the best exact position and size of the window.
To sum up it's a mess and I would be surprised if you don't have problems with that roof in the future, it needs redoing by a proper roofer who knows what they are doing.

 

[Biologyman]

Thank you to you both - I really appreciate your input. I've spoken to the builders and they have corrected everything and all now looks fine. Couldn't progressed without your input.

 

[chappers]

Got some new puctures?