Hi,

We are considering putting an offer on a house but the outside wall which is the internal wall of the adjoining garage has me slightly concerned. Amateur DIY is as far as my skills go so some advice appreciated.
The house is a fairly standard 2 floor house, and the garage butts into the side with a pitched roof. This is leaded on the outside where it meets the main house.

The images below show the inside of the garage, which I initially thought was a subsidence problem however the regularity of this I'm wondering if it is actually as expected and this is roofing trays or similar.
The material appears to be a rubber of some sort. Please can someone let me know if there is any concern here, or if it is fairly normal in modern houses.

Thanks!

See area of concern running diagonally along the roof line, roughly one brick from the roof beams:


Closer look


Even closer

Thank you, I see what you mean and yes this is below the leading as it is on the inside of the garage.

I was advised by a roofer some time ago that my current house doesn't even have these, which is part of the reason we have occasional issues with the roof leaking.

I have found at http://www.diydoctor.org.uk/projects/cavities,cavity%20trays,%20lintels%20and%20... that these may be cavity lintels, not cavity trays and that being the case may have been installed in the right place!

I would appreciate any more thoughts on this, perhaps these won't work as they should where they have been installed but ultimately is it a huge problem that they aren't installed where they are more needed?

Looks to me as though they pitched a higher roof at build or the brickie got them in the wrong place.

Don't know how old it is but no damp or water seems to be running down the wall.