I'm quite new to DIY but having had success fixing rotten floor joists I'm keen to get onto the next job!
I've noticed that the rear roof (through which we're planning to put a flue in order to move the boiler) is sagging slightly in the middle, and the cement/mortar above that section is coming free, exposing the (what I guess should be) internal side of the lead lining. I think that water might be getting in and has compromised the rafters, hence the dip in the roof.
I have read a little about "buttering up" of roof ridges and it being a no-no, so I'm not sure if this was just a bodge job at some point in the past and if I just chip out all of the old/loose cement/mortar and replace, I'd just be repeating a shoddy bit of work all over again!
Would anyone be able to tell me what the proper fix for this would be? Maybe the steps I should take to fix it properly?
Any help would be really appreciated! What I lack in experience I make up for in enthusiasm... but I'm very aware I actually need to learn what the hell I'm doing eh!
Pics are here, sorry for the external link... DIYDoctor only lets me upload 500k pics which just aren't big enough!