Step 4: Assemble the cardboard sheets

Picture of Assemble the cardboard sheets
The roof sheets glue or tape to the wall sheets by overlapping the bottom flaps of the roof sheet with the top flaps of the wall sheets. Tape the vertical joint, shown by the red line, on the front and back of the sheets. This is a folding joint, so leave a 1/4" gap between the sections so the joint folds easily in either direction.