Waterproofing an external wall

[Glastoun]

We have moisture coming through the corner of an external wall, and reasonably sure that the ridge of tiles halfway up the wall is part of the problem, as it's likely that water can settle on/in it:

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A few people have recommended treating/repairing it somehow, possibly including installing lead flashing on its topside to make sure rainwater drips down to the ground, but no-one has laid out an actual solution.

A roughcaster has said that the render itself is sound, and a painter is happy to scrape back the loose layer, paint some kind of weatherseal coating and then repaint the whole house as it's fairly weathered and old, but I want to make sure that damp can't get in anywhere.

What would you recommend?

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[^woody^]

It looks like the problem is that open gap between the render and tile.

Clear off the paint as necessary and have it filled with cement grout and then repaint the area. Or make good the render around it if it's loose

You'll need to either replace those delaminated tiles or make sure that they are sufficiently covered with render and paint

 

[Glastoun]

That sounds like less work than I had in mind, which is good.

So between the bricks, render, cement grout where needed and a repaint of the whole house, that should keep the moisture out?

 

[^woody^]

"Should"

I'm not putting anything in writing though.

 

[Tipper]

Check the gutters above too!

 

[Glastoun]

Could someone link to some suitable cement grout please, finally getting round to sorting this (after 15 months).

I've used Polycell quick dry cement filler before, but only for little touchups, and it's way too expensive for something like this. Almost dries too fast to work with too.

 

[^woody^]

Buy a bag of "Cement", mix it with water so it's runny, voila "Cement Grout"