Fix pipe penetrations

[benox]

Hello

I've just had waterborne heating installed in the house, resulting in a lot of copper pipes through the walls. The walls are made of plastered Leca, so it looks like someone shot the holes with a small cannon instead of drilling... I'm thinking of tidying this up, but what's the best way to do that? I assume the heating pipes need to expand a bit, so just sealing with mortar might not work?

 

[Raceman]

Foam sealant is usually good to use for this. Cut away the excess once it has dried, then you can finish with a latex filler before you finally paint or whatever you want to do.