fretting mortar

[GrantMcscott]

My house is due to get rendered in the summer and the wall have been up for a few years.  I have noticed in some places that the motar has started to fret.  If you run a trowel along it it will dig in about 20mm

 

Is it OK to render over it or will it need repointing first as it will be a big job and do not want to delay getting it rendered.  We will be using K Rend

[twice round the block]

Not sure how a K render base coat will handle block work that has been exposed to the elements for a few years.

You may need to ask the manufacturer which base they advise and go from there.

[GrantMcscott]

On 28/04/2024 at 20:32, twice round the block said:

Not sure how a K render base coat will handle block work that has been exposed to the elements for a few years.

You may need to ask the manufacturer which base they advise and go from there.

Hi I asked K-Rend and sent them pictures and they said it will be fine