Woodfibre insulation boards need to be carefully laid out, cut accurately and detailed around windows and are also tongue and groove and so require a surprisingly high level of skill to fit properly, such as provided by a skilled trade such as a carpenter. Woodfibre is much more difficult to fit than EPS which is square edged and gaps can be simply foamed. I would make sure any woodfibre EWI installation uses appropriately skilled trades and don’t assume the regualar EPS system installers can handle a woodfibre job. We also had a bit of a run around with the number of fixings and locations required for the NBT Diffutherm system so worth getting this resolved upfront. As Brighton is Zone 3 for rain and wind, NBT required 6 fixings per board with 3 pe board along any exposed edges. Never did get to the bottom of weather a pull out test was required and who should be making this call. Also consider which fixing is suitable once the substrate is known. Nice to use wood though…
