Internal block wall - block type to still take decent fixings

[Spreadsheetman]

Does anyone recommend a sub-7Nm block that has an improved thermal performance, but will still take a fixing for heavy-ish things? (Radiators in particular)

 

I’ve used the pumice-like aerated ones when I needed to cut something into a random shape to fill an awkward deep hole in an internal wall, but I’d not try and stick a wall plug in them.

 

e.g. https://www.wickes.co.uk/Aerated-Block-3-6N-100mm-Single

 

[JohnMo]

Aerated are fine, but it's just a matter of using rawlplugs specifically designed for aerated blocks, rather than random plugs, which split the block.

[wozza]

I used Fibolite blocks - Thermally better than the ones in the link, hold fixings really well, and a bit cheaper too.