Work Starts on Site
Detailed design work on the project started late in 2015. At the beginning of 2016 a local builder, Alan Ruck was appointed to oversee the construction work. Strip out work started on barn B initially. The condition of the west gable wall was found to be in poor condition, dropping significantly at one corner due to subsidence. This would need to be demolished and rebuilt. With a number of new openings required in the south elevation and the north elevation being open, it was decided that it would be more economical to demolish the north and west elevation and re build them with the original bricks. This decision was further compounded by the proposed basement under barn A.
Passivhaus, Dulwich Estate
Once the walls were demolished to barn B, the next job was to stabilise barn A before any work could start on the basement under barn B. This required underpinning all the existing corbelled foundations in a hit in miss fashion. The existing foundations were divided into 1000mm bays and given a number sequence of 1-5. So as not to undermine the walls, bays were excavated in sequence and new concrete foundations cast underneath. These were left to cure for 48hrs before dry packing and a further 24hrs before work could commence on an adjacent bay. Each bay was tied into the next with steel dowel bars. The process of completing the underpinning was slow and took a couple of months. Once completed the existing floor was lowered by approximately 700mm to allow for a new hardcore base, floor slab, 225mm of insulation and screed.