At the end of week 3 the timber frame team have laid the first floor joists and started erecting walls to the first floor.
The I beams forming the entrance hallway at ground level have been clad with a 16mm thick DWD board which forms the airtight layer. The DWD board will eventually cover the entire house externally. We will then put the breather membrane over the DWD board, fix battens and cladding.