Standard single storey extension, brick outer, aircrete inner, walls holding up 1 tonne shallow pitch tiled roof. In a standard build like this, is there any requirement to increase the catnic style lintel bearings from the minimum 150mm ? Since it costs not a lot more, I thought I'd increse bearings to, say, 200mm just to be sure. Any point in doing this ?
Also, any problem with the 75mm wide contact area for joist hangers or purlins built into the aircrete wall ?
Also, sometimes engineering bricks are recommended as a spreader, but this will be reducing the insulation of the wall. In these types of conflict in regs, what is the usual BCO view ? (Bit like the conflict between insulation and ventilation at the moment) Cheers, Simon.