Browse Forums Owner Builder Forum it depends on the natural ground level, if they excavated their boundary wall needed to be built as a retaining wall. If you filled, which sounds like the case then you… 1 7085 I know foam has been around since the 90's and CSR started manufacturing Hebel in 1989, so it's definitely possible 5 5453 You are correct. Just read through all the ncc rules and 75mm is the minimum requirement for me. 4 11181 |