Splurge of water ingression during heavy rain.

[MoonMan2]

We've had some heavy rain over the past week and not a peep of water ingression to the concerned ceiling has occurred.

I can therefore say with a degree a confidence that the roof was never the problem and that the water ingression has come from the two water exhaust pipes, that have been 'covered up' by the extension build.

As I've resolved the water coming out these exhaust pipes, it is no longer an essential job that needs to be carried out quickly. My plan is to install a loft-hatch next summer, go inside the loft space and see what I can do about these two pipes.

In the meantime, I have a question:

What are builders supposed to do when attaching an extension onto an external wall that has water exhaust pipes coming out of it?

 

[Alastairreid]

They would move the pipes.

 

[MoonMan2]

They would move the pipes.

To where?

And, when you say 'move', I presume you mean 'extend'?

 

[catlad]

Extend or move? whichever is easiest.

 

[MoonMan2]

Extend or move? whichever is easiest.

Obviously I'm missing something really obvious here.

How can you 'move' a pipe? Do you mean re-route it from the source?

 

[catlad]

Yes move from source to another location, ie not inside a roof void!

 

[drpepe]

Sounds like you’ve sorted it.

Exactly the same thing happened when I had a ground floor extension built, the builder plaster-boarded over what was previously an external wall with an overflow from the 1st floor toilet. Unknown to us initially, the toilet cistern had an issue of intermittent sticking and kept overflowing and causing damp marks/staining inside the extension. We also thought it was rainwater and it took a while and a fair bit of plaster damage to work out the issue.

Funnily enough we had another toilet in the house incident where an overflow terminated within the eaves of the converted loft… exactly the same thing happened , but this time into an upstairs bedroom

in both cases , fitting an internal overflow in the cistern fixed the issue.