House Drawing dwg file. This drawing shall be read in conjunction with architects drawings and specifications. Concrete shall be 35N20 and not placed when the ambient air temperature is less than 5 degrees C Reinforcement: All reinforcement shall be lapped 40 x (diameter of bar) Bar type Bar Lap T10 400mm T12 480mm T16 640mm T20 800mm Reinforcement shall be fixed adequately using tying or steel clips. Concrete cover shall be minimum 50mm . All necessary chairs and spacers are to be provided to maintain the specified cover. 75mm sand/cement screed on 50mm floor insulation on DPM on 150mm deep conc. slab reinforced with A393 mesh (Grade 35N concrete throughout) on Radon Barrier. Laid on 50mm sand blinding on 300mm min compacted hardcore blinding hardcore shall be mechanically compacted in layers not exceeding 225mm and to a depth not exceeding 600mm ROOM VENTILATION Habitable Rooms: (1) Background ventilation ie. Wall vent or controllable window vent and (2) Rapid ventilation ie. window. Kitchen Utility Rooms: (1) Background ventilation wall vent and (2) Rapid ventilation ie. window. (3) Mechanical extract ventilation system (see specifications). Bathroom: (1) Rapid ventilation ie. window. (2) Mechanical extract ventilation system (see specifications). VENTILATION TO ROOM CONTAINING HEAT PRODUCING APPLIANCES. Room with a fire, stove, range etc.: (1) A PERMANENT open wall vent. (2) Rapid ventilation ie. window.