The back wall of the garage is very close to the fence and will need to be made in one piece and stood up as the will be no access to the back. The close proximity to the fence also means the wall will have to have a fire proof exterior.
Simple we thought, just use fibre cement boards to cover the OSB! But when we asked Jewson for some they could only offer strips 125mm wide for soffits! Jewson checked their suppliers and came up blank (other than tile backing boards).
Internet to the rescue! There appear to be dozens of different sheets available, now to find a supplier willing to ship only 10 sheets… we found a supplier who will send any number you want for a fixed delivery charge. Sheets were £14.50 each and delivery £55! Now we hope the will deliver fairly quickly…