Popsicle sticks are a frequently used craft supply, and have a wide variety of applications. Using Popsicle sticks in modeling can yield impressive results, as Popsicle sticks can be bent and manipulated into many different shapes. For a Popsicle stick treehouse, several materials are needed in addition to the sticks.
Sketch an outline of the treehouse. This can help you plan how many Popsicle sticks you need, and which ones will need to be bent. Plan how wide the tree will need to be to hold your treehouse.
Apply glue to the narrow side of a Popsicle stick, then press another stick into the glue. Continue gluing Popsicle sticks side by side to form the floor of the treehouse. Glue a Popsicle stick diagonally across the surface for stability, then sit this aside to dry.
Glue together six more flat surfaces according to the method in Step 2 and as wide as your drawing calls for -- four of these flat surfaces will form the walls, while the remaining two will form the roof.
Form the skeleton of the tree by cutting Popsicle sticks in halves or thirds, depending on the size of your tree. Glue the stick pieces into circles. Increase the size of the circle depending on where on the tree the circles should be. Let the circles dry completely.
Attach the walls to the floor by applying glue to the narrow edges of the floor, then pressing the wall against it. Quickly apply glue to the vertical sides of the walls, then press the wall sides together. Brace the walls with heavy objects while the walls dry if required.
Glue Popsicle sticks vertically on all sides of the largest circle for your tree. This will form the tree trunk -- brace the sides of the tree with heavy objects while the trunk dries if necessary.
Build up the tree by adding smaller circles and vertical Popsicle sticks as in Step 6. Let the tree dry completely with each added circle, building the tree up with progressively smaller circles.
Glue Popsicle sticks around the tree skeleton to fill in the trunk if required.
Glue three Popsicle sticks together into a triangular prism and allow this to dry completely. Use this prism to attach the roof flats together -- apply glue to the right and left sides of the prism, then press the roof flats onto the prism so the top edges meet.
Place the roof of the treehouse on the four walls. Secure the roof to the treehouse with glue if desired.
Place the treehouse in the tree and secure it with glue.
Soak Popsicle sticks in water so they bend easily if your model requires it.