What is recommended in the way of building preparation (methods 1, 2, 3)?
For methods 1 and 2, the Austrian national annex to ISO 9972 page 6, Item 6.3, Table 1, applies. For method 3, there are no references in the national annex. In this case, ISO 9972 applies.
If method 3 is selected, is a checklist drawn up? Of interest is the issue of fixtures incorporated into the building envelope, like letterboxes, window rebate ventilation, WC fans and fire dampers.
There is no checklist for method 3.