HP12 washed away

[Mr Blobby]

HP12 base coat was applied on garage wall in the rain and now looks like this 

 

They told me it would be fine when I pointed at the skies during application.  Of course they would say that.  But it's not fine.

 

In fairness this base coat is just to seal the blockwork before battens are applied and cladding over the top, but even so, it looks like salts all washed out all over.

 

 

Bill has arrived. What do I do here?

Edited 12 hours ago by Mr Blobby

[Russell griffiths]

Get them to re do it, or don’t pay. 

[Mr Blobby]

10 hours ago, Russell griffiths said:

Get them to re do it, or don’t pay. 

 

All of it, or some of it. 

 

Builder thinks most of it is ok. 

 

Lot's of salts on the surface and light patches, is this just aesthetic, or will the mortar be weakened? 

 

Also, I asked for the base coat to have a break at the dpc to not bridge it.  My builder rolled his eyes, and insists this is nonsense. Render scratch coat is always applied as a single coat over the dpc to the ground. 

 

Bridging the dpc seems wrong to me, is it?

[Russell griffiths]

Your builder still thinks it’s 1980. 
break at dpc for me. 

[Nickfromwales]

4 hours ago, Mr Blobby said:

Bridging the dpc seems wrong to me, is it?

Yup. Why introduce any unavoidable risk, especially if you're cladding over it which would make rectifying any feck-ups a costly process.

 

4 hours ago, Mr Blobby said:

Builder thinks most of it is ok. 

 

Lot's of salts on the surface and light patches, is this just aesthetic, or will the mortar be weakened? 

It's more of disappointment / frustration vs life or death, so patching it in should be fine if it's not the fundamental rain screen.