slates

Simple question here? How does water get passed slates when they are showing no wear or cracks? My only feeling is water gets passed between the slates laid on each other? If that's so why amI told not to seal the edges of the slates, because in my mind wouldn't that stop the leak? Next question...

Roofer wants to glue in replacement slates. Not sure I like this idea because: - it will make further repairs in the area difficult because there are now 3 slates glued together. A roofer working on second repair would not know this and would have difficulty determining which slates to remove...

Hi everyone, So for quite a long time this roof over the bathroom/sheds at the back of my mum's house has been leaking pretty heavily every time it rains. However, there never seems to be any leaks on the half over the bathroom which is why she hasn't sorted it yet. From the pictures, you can...

They retain the gable end mortar at the bottom. Might have to replace some soon when I put off some fascia and have no idea what they are called. Thanks in advance