Stripped stone walls meeting rendered walls

[zunetunes]

Have got the builders in to deal with the exterior walls to deal with penetrating damp. Stripping all the cement render off the original stone walls, although our first choice, is not viable due to cost and the fact that there are numerous doorways/ windows etc which have been filled with breeze blocks etc and a more modern extension as well.

Builders have taken off some render where it was a bit loose, around a kind of small courtyard wall which is not integral to the house. This looks nice in its unrendered condition and we'd like to leave it like this. My concern however is that where the unrenedered wall meets the rendered wall, this will be an opportunity for damp to get into the rendered wall.

Any thoughts?

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[Lime]

My concern however is that where the unrenedered wall meets the rendered wall, this will be an opportunity for damp to get into the rendered wall.
Any thoughts?

my thoughts are that it depends to some extent on your prevailing weather conditions and the exposure of the unrendered wall to rain.
It is equally possible to turn your worry on it's head and say that the rendered wall will now be able to "breath" through the unrendered wall!
If the rendered wall is like many I have seen it is not dry inside as the render holds moisture in.

Unfortunately, and far too often, render is used to cover a multitude of sins such as breeze blocks, damaged and weathered brick and other unsightly nasties. It makes me quite cross to see such work being carried out when with a bit more care, money and thought a long-lasting repair could be made.

 

[zunetunes]

There is quite a lot of wind and rain on that side. The render was obviously done many years ago. Unfortunately de-rendering it isn't an option.

 

[NT]

Bare patches will allow some evaporation. If the edge of the rendered holes are sloped, water will run off away at the bottom. Such patches can look quite a bit better than render, and of course it can allow a long term self-derendering process to occur.

Edges turned 90 degrees cos wrong font: ________/ \_________


NT