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This two story fort playhouse will be loved by young and old.  It also offers flexibility. You can close in the bottom and add doors for a storage shed while the kids have the top as a playhouse. (which is where they want to be anyway!)

 

Step1: Frame 1st and 2nd floor system following diagrams shown. Use 2x6x8' pressure treated lumber and measure to have outside to outside dimensions exactly 8' x 8' on first floor,  and  8' x 10' for the 2nd floor. 

Step 2: The lumber and measurements on the next step will be determined by what you are going to do with this structure. If you will be making the bottom a storage shed, the height you will need will be taller than if it is a playhouse.  For a children's playhouse use 4x4x10' PT lumber uprights.  Measure 60" from one end (make that the bottom) and mark a line. This is the mark for the bottom of the second floor joists. 

Step 3: Install  4  -  4x4x10' uprights to first and second floor framed sections following measurements given in step 2.  Bolt these uprights in place with 2 - 1/2"x4" Galv. lag bolts at each attachment point.  On corners place 2 on each side of the corner.



Note:  The easiest way to accomplish step 3 is to assemble the unit on it's side.  Use a helper when lifting the structure to the upright position. 

Step 4: With the unit in the upright position we are ready to level and brace it. Level the first floor on the ground.   Using a level, temporarily plumb and brace the vertical uprights, while 45 degree braces are installed on the first floor that are shown in the picture.  Cut these 24" long with a 45 degree angle in each end. Bolt these to the bottom of the second floor joists and the 4x4 upright as shown.

Step 5: Now it's time to install the plywood floor. Add 3 1/2" long nailers to the sides of the 4x4 uprights at the spot where the plywood floor meets the upright. (the cut out is necessary to allow the upright post to pass through the plywood floor). If you do not add these nailers the floor will be springy. Measure, cut and install the plywood floor on both floors. Use pressure treated 5/8" plywood if possible. (1/2" will work if 5/8" cannot be located)

 

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