Hi All, We have a 100 year old farm cottage, which is constructed from local stone for the foundations and "Littlehamptom Brick Co" red bricks in a double wall with central cavity. I'm told the walls are Flemish style, because they have a course across the top to tie the two walls together. This seals the cavity, preventing blow in rockwool type insulation from being installed. Also, the cavity is only around 50mm wide, so access for rockwool is tricky even if you were to remove bricks near the top of the wall to blow it in. Double brick provides plenty of thermal mass, but little insulation. In winter in the Adelaide Hills, cold SW winds blow around our home, sucking all warmth from it. The cast iron wood heater can stay on for ages, but the brick walls never warm up. I've planted a windbreak to the SW which in a few years will reduce this wind chill factor, but I also want to insulate the outside of the bricks, to provide all that thermal mass with a chance to heat up properly. I'm planning to put in standard sized steel houseframe c section, dynabolted directly to my exterior brick walls, which will allow for 600mm wide R3.5 insulation batts to be installed, then cover the lot with lightweight cladding, either zincalume, galv iron or blueboard/render. This will in effect give me a reverse brick veneer, with an air cavity and a second wall of bricks inside the house. But all that sounds very materials intensive and the embodied energy will be high. Is there a good permaculture method to achieve excellent insulation for double brick walls? I thought of growing ivy on the bricks, but apparently this can be a fire hazard as it can catch embers. Also, I think you only get about R1 equivalent from an ivy covering. I'm open to suggestions. Also, our floor is lovely old floorboards about 500mm above the ground. Not enough crawlspace to easily insulate under the floor. We don't want to put in underlay and carpet because we love the look and easy care of the timber floors, but we want to be warm too! Help!