Cracking in render of 250mm bead full fill bungalow cavity

[fclauson]

Hi all

 

looking for some advice - build is 12 years old - bunglow built to passive standards in rural Ireland in a windy eleventated spot 

 

after around 4 years we noticed some external cracking which has got a little (bit not a lot) wose over time 

 

we hacked of some render this week to see if block was cracked and cloncluded it was not 

 

we not that some of the cracks are "damp" but it had just rained really heverly 

 

some thoughts are 

a) there should have been expansion joints (would this be in just the render or in the block work ?)
b) this is a passive house so no heat is coming to external wall so it has no "drying" from inside - how does this effect things 

 

would love thoughts 

 

1 - what is causing the cracking 

2 - what repair scheme you would suggest 

[PeterW]

Corner one looks like the render bead has blown and moved - what sort of render is it ..? Sand and cement..?

 

@nod any thoughts ??

[nod]

3 hours ago, PeterW said:

Corner one looks like the render bead has blown and moved - what sort of render is it ..? Sand and cement..?

 

@nod any thoughts ??

It looks like the building has settled 

It’s repairable 

[fclauson]

Thanks all - yes its sand and cement - 
@nod thanks for this - would you just fill with a flexible filler (https://www.toupret.co.uk/professional-filler/product/problem-surfaces/fill-flex or similar)
if so what brand would you recommend
also - any thoughts on expansion joints - that back wall is over 13M wide 
if so just in the render or in the wall as well (retrofit)

then we hope to powerwash - and repaint 

we did have a Mica scare in the area but we are reasonably confident its not that 
 

[Iceverge]

A friend who's a plasterer recommended I should paint our house without too much delay due the sand and cement sponge finish we had. He seemed to think that the driving rain we get could get into the render and weaken it and a good coat of paint would waterproof it somewhat. 

 

I did after the first summer we had moved in and haven't had any issues. 

 

Is there paint on that wall or is it coloured plaster? 

 

[nod]

Expansion joints wouldn’t have made any difference with is type of cracking 

I would cut out 50 mil either side of the cracks with a grinder and replace the render and Tyrolean over the whole area