Can't solve damp problem

[chris_elevate]

I'm desperate to solve my damp problems but can't get to the bottom of it.

I've got an end of terrace house, rendered, solid construction.

Upstairs at the front of the house I've got damp coming in through the walls but no signs of leaking guttering or drain pipes.

I've just recently (4months ago) has blown render removed and the WHOLE house grc rendered from top to bottom. I'm now convinced that the sides of the house won't allow damp through now because it's totally sealed!

My roof had cement tiles put on before I bought the house but not reinforced to handle the weight! The roof is therefor sagged and I wonder what amount if hassle people could get from water somehow getting into the tops of the Walls and soaking down?! Does this happen?

Is it a huge job stripping off a roof, putting some new timbers in, refelt and re tile?

Thanks for anyone that can shed some light or help in anyway

[stoneyboy]

chris_elevate,
I assume you are referring to concrete interlocking slates. With exposure these become porous so if they have been set onto the top of your walls without a damp membrane this may be the cause of the damp.
Lift the tiles above the damp area and see what the construction is.
end