I want to bury 15mm diameter central heating pipes in a rendered and plastered wall. Are there any guidelines I should be following e.g. should I cover/paint the copper pipes before placing in the chased out channel? Is there a minimum thickness of render/finishing plaster I should have over the buried pipes. I can see that the area of wall where the pipes are buried will go through a thermal cycling as the buried pipes are heated and cool down - does this cause a problem and is there a preferred way to minimise the impact of this e.g. how I set the heating controls ?
Many thanks Ed