2d house construction detail cad file

2d cad drawing of house construction detail cad file includes staircase slab detail and wooden roof detail, along with all design The containers of roof are of 0.90m x 0.90m by 1.20m  with a layer of gravel or crushed in about 20 cm of thickness evenly distributed, download in free autocad file and use for cad presentation in cad format.