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You will need 1 sheet for each floor in the house. Place the poster board on a flat work surface, such as a desk or table and then place the tracing paper over the poster board. Make sure that you have plenty of room to work and that the surface is flat and sturdy. The poster board is important since tracing paper is transparent. Identify where you want the borders of the house to be and then draw them to scale. However, make sure to consider the rooms and features that you want the house to have as you draw the outer walls. For example, you might make the exterior walls of your house 30 by 50 feet (9.1 by 15.2m) if you want an extra-large living room. The second line you draw will be parallel to the first line all the way around. This second line indicates the thickness of your walls. The outer walls of the house should be at least 5.5 inches (14cm) thick, but they can be thicker depending on your design and insulation plans for the house. For example, if you will be insulating the walls with hay bales, then the walls will need to be thick enough to accommodate the hay bales. After you have identified the inner and outer borders of the house, add lines inside the inner walls to indicate where rooms and hallways will be. Use 2 parallel lines for each of the walls and make the interior walls at least 3.5 inches (8.9cm) thick. For example, you might create walls to indicate the borders of the bedrooms, bathrooms, hallways, kitchen, closets, living room, and dining area. " If there will be a stairwell going from the first floor to the second floor, draw stairs and lines to indicate the walls alongside the stairwell. Then, write the word "up" at the base of the stairwell with an arrow pointing in the direction that people will walk up the stairs. If your stairwell will not have walls on 1 or both sides, use a dotted line to represent the border of the stairwell. Do the same thing for the stairwells on the second floor of the house, except write "down" and draw an arrow to indicate where people will walk down the stairs.
Place 24 by 36in (61 by 91cm) tracing paper over the poster board. Draw the outline of the outside of the house. Add a second line to indicate the width of the house's walls. Create interior walls for separate rooms and hallways. Draw any stairways on the first floor and label them with "up.