Rockwool have been on site to carry out pull-out tests for the external wall insulation board fixings. All passed. We're planning to use their REDArt system with 200mm and 100mm Dual Density mineral wool slabs.
There has been much discussion about the air-tight layer, which for this project, is at the outside face of the existing brickwork. The original plan for a sand and cement parge coat hasn't worked out as we can't find available tradesmen. Plan B is to rely on the adhesive that bonds the insulation boards until they're mechanically fixed. We'll stagger the two board layers and adhere the second one too, to reduce risk of air-leakage at the joints. This is new ground for Rockwool, and we won't know if it works until the air test in a few weeks. We are looking to use either EJOT's STR U 2G or Rawlplug's TFIX-8S screw in fixings, probably 355mm long for adequate embedment.
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Russel and Anna Hayden
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