Shed design. Open in OpenScad to view 3d model.

shed.scad

windows = false;  // show windows
stuff = false; // Show bikes, table, mower

l = 32; // Length of building in feet (16, 20, 24, 28, 32, ...)
h = 8*12-4.5+.5;
rl=6*12+1.375+.1; // cut to 73.5" long with 22.5 degree angles
tl = 68.7; // Used to tweak headers on top walls

// 2x6 concrete forms for foundation
// 10" wide grid
// rebarb reinforced. 3/8

module Foundation() {
  color([.9,.9,.9]) {
      cube([16*12,l*12,12]);
  }
}

module FloorRafters(ll) {
  color([.95,.8,.6]) {
    translate([0, 0, 0])
      cube([16*12, 1.5, 9.5]);
    for (i = [1:ll*12/24-1]) {
      translate([1.5, 24 * i - .75, 0])
        cube([16*12-3, 1.5, 9.5]);
    }
    translate([0, ll*12-1.5, 0])
      cube([16*12, 1.5, 9.5]);
    translate([0, 1.5, 0])
      cube([1.5, ll*12-3, 9.5]);
    translate([16*12-1.5,1.5,0])
      cube([1.5,ll*12-3,9.5]);
  }
};

module LowerSubfloor() color([.9, .8, .7]) {
  for (x = [0:4:16-4]) {
    for (y = [0:8:l-8]) {
      if (x % 8 == 0) {
        translate([x*12,y*12,0])
          cube([4*12, 8*12, .703]);
      }
      else {
        if (y <= l - 12) {
          translate([x*12,(y+4)*12,0])
            cube([4*12, 8*12, .703]);
        }
        else {
          translate([x*12,(y+4)*12,0])
            cube([4*12, 4*12, .703]);
          translate([x*12,0,0])
            cube([4*12, 4*12, .703]);
        }
      }
    }
  }
}  
module UpperSubFloor() color([.9, .8, .7]) {
  for (x = [0:4:16-4]) {
    for (y = [0:8:l-8]) {
      difference() {
        if (x % 8 == 0) {
          translate([x*12,y*12,0])
            cube([4*12, 8*12, .703]);
        }
        else {
          if (y <= l - 12) {
            translate([x*12,(y+4)*12,0])
              cube([4*12, 8*12, .703]);
          }
          else {
            translate([x*12,(y+4)*12,0])
              cube([4*12, 4*12, .703]);
            translate([x*12,0,0])
              cube([4*12, 4*12, .703]);
          }
        }
        translate([5.5,5.5,-.01]) {
          cube([119.5-11.5,48,3]);
          cube([48,113.75,3]);
        }
      }
    }
  }
}

module SideWall(w, ll, ac, e) {
  
  // Window
  if (windows && w) %translate([-1, w*24+.75+1.5, 34+12])
    cube([5, 36, 36]);

  // Air conditioner.
  if (windows && ac) %translate([-1, ac*24+.75+1.5, 64])
    cube([23, 23+7/8, 18]);
  
  // Bottom Plate
  cube([5.5,ll*12,1.5]);

  // Top Double Plate
  translate([0, 0, h+1.5])
    cube([5.5, ll*12, 1.5]);
  if (e) {
    translate([0, 5.5, h+3])
      cube([5.5, ll*12, 1.5]);
  }
  else {
    translate([0, 5.5, h + 3])
      cube([5.5, ll*12-11, 1.5]);
  }


  // Studs
  translate([0,0,1.5])
    cube([5.5, 1.5, h]);
  if (e)  translate([0,5.5,1.5])
    cube([5.5, 1.5, h]);
  
  if (w) {
    
    if (w >= 1) for (i = [1:w]) {
      if (i != ac + 1)
      translate([0,24*i-.75,1.5])
        cube([5.5, 1.5, h]);
    }
    
    translate([0, w*24, 0])
      lowerWindow();
    
    if (ll*12/24-1 >= w + 2) for (i = [w+2:ll*12/24-1]) {
      if (i != ac)
      translate([0,i*24-.75,1.5])
        cube([5.5, 1.5, h]);
    }
  }
  else for (i = [1:ll*12/24-1]) {
    if (i!= ac + 1)
    translate([0,24*i-.75,1.5])
      cube([5.5, 1.5, h]);
  }
  if (ac) translate([0, ac*24, 0])
    ac();


  // Corner studs
  translate([0,ll*12-1.5, 1.5])
    cube([5.5, 1.5, h]);
  if (!e) translate([0,ll*12-7, 1.5])
    cube([5.5, 1.5, h]);

}

module UpperFloor() color([.95,.8,.6]) {
  // First
  cube([16*12, 1.5, 9.5]);
  
  // Short
  for (i = [1:2]) {
    translate([126.5, 24 * i - .75, 0])
      cube([64, 1.5, 9.5]);
  }

  // Medium
  for (i = [3:4]) {
    translate([55, 24 * i - .75, 0])
      cube([135.5, 1.5, 9.5]);
  }
  
  // Full width 
  for (i = [5:7]) {
    translate([1.5, 24 * i - .75, 0])
      cube([16*12-3, 1.5, 9.5]);
  }
  
  // Last
  translate([0, 16*12-1.5, 0])
    cube([16*12, 1.5, 9.5]);
  
  translate([5.5+48,53.5, 0]) // Medium cap
    cube([1.5, 41.75+24, 9.5]);
  translate([55,55-1.5, 0]) // med-to-small
    cube([70.25, 1.5, 9.5]);
  translate([125,1.5, 0]) // small cap
    cube([1.5, 69.75, 9.5]);
  translate([5.5,4, 0])
    cube([119.75, 1.5, 9.5]);
  translate([4, 1.5, 0])
    cube([1.5, 93.75+24, 9.5]);
  
  // Edges
  translate([0,1.5, 0])
    cube([1.5, 16*12-3, 9.5]);
  translate([12*16-1.5,1.5, 0])
    cube([1.5, 16*12-3, 9.5]);
  
}


module Back() {
  // Bottom Plate
  translate([5.5,0,0])
    cube([16*12-11,5.5,1.5]);
     
  // Back Wall
  translate([5.5,0,1.5])
    cube([1.5, 5.5, h]);
  for (i = [1:7]) {
    translate([24*i-.75,0,1.5])
      cube([1.5, 5.5, h]);
  }
  translate([16*12-5.5-1.5,0,1.5])
    cube([1.5, 5.5, h]);

  // Top double plate
  translate([5.5,0,h + 1.5])
    cube([16*12-11,5.5,1.5]);
  translate([0,0,h + 3])
    cube([16*12,5.5,1.5]);
        
}



module lowerWindow() {
  translate([0,.75,1.5]) // Jack Stud
    cube([5.5, 1.5, 80.5]);

  translate([0,.75,82]) // Header 0
    cube([5.5, 36+3, 1.5]);
  translate([0,.75,83.5]) // Header 1
    cube([5.5, 36+3, 1.5]);
  translate([0,2.25,32.5+12]) // Sill
    cube([5.5, 36, 1.5]);
  translate([0,24-.75,85]) // Upper Cripple
    cube([5.5, 1.5, h-83.5]);
  translate([0,24-.75,1.5]) // Lower Cripple
    cube([5.5, 1.5, 34-3+12]);
  translate([0,36+2.25,1.5]) // Jack Stud
    cube([5.5, 1.5, 80.5]);
  translate([0,36++3.75,1.5]) // King Stud
    cube([5.5, 1.5, h]);
}
module ac() {
  translate([0,.75,1.5]) // Jack Stud
    cube([5.5, 1.5, 80.5]);
  translate([0,.75,82]) // Header 0
    cube([5.5, 23+7/8+3, 1.5]);
  translate([0,.75,83.5]) // Header 0
    cube([5.5, 23+7/8+3, 1.5]);
  translate([0,2.25,62.5]) // Sill
    cube([5.5, 23+7/8, 1.5]);
  translate([0,24-.75,85]) // Upper Cripple
    cube([5.5, 1.5, h-83.5]);
  translate([0,24-.75,1.5]) // Lower Cripple
    cube([5.5, 1.5, 61]);
  
  translate([0,23+7/8+.75+1.5,1.5]) // Jack Stud
    cube([5.5, 1.5, 80.5]);
  translate([0,23+7/8+.75+3,1.5]) // King Stud
    cube([5.5, 1.5, h]);

}


module Front() {
 
  // Big Door
  if (windows) %translate([58.5,-1,0])
    cube([75,7,83.5]);

  // Bottom Plate
  translate([5.5,0,0])
    cube([60-5.5-1.5,5.5,1.5]);
  translate([133.5,0,0])
    cube([60-5.5-1.5,5.5,1.5]);

  // Studs and Frames
  translate([5.5,0,1.5])
    cube([1.5, 5.5, h]);
  translate([24-.75,0,1.5])
    cube([1.5, 5.5, h]);
  translate([48-.75,0,1.5])
    cube([1.5, 5.5, h]);
  translate([60-4.5,0,1.5]) // King Stud
    cube([1.5, 5.5, h]);
  translate([60-3,0,1.5]) // Jack Stud
    cube([1.5, 5.5, 82]);
  translate([60-3,0, 83.5]) // header 0
    cube([78, 5.5, 1.5]);
  translate([60-3,0, 85]) // header 1
    cube([78, 5.5, 1.5]);
  for (i = [3:5]) { // Cripples
    translate([24*i-.75,0, 90.5-4])
      cube([1.5, 5.5, h-89+4]);
  }
  translate([133.5,0,1.5]) // Jack Stud
    cube([1.5, 5.5, 82]);
  translate([132+3,0,1.5]) // King Stud
    cube([1.5, 5.5, h]);
  translate([144-.75,0,1.5])
    cube([1.5, 5.5, h]);
  translate([168-.75,0,1.5])
    cube([1.5, 5.5, h]);
  
  translate([192-7,0,1.5])
    cube([1.5, 5.5, h]);
  
  // Top Double Plate
  translate([5.5, 0, h + 1.5])
    cube([181,5.5,1.5]);
  translate([0, 0, h + 3])
    cube([192,5.5,1.5]);
}

module TopWall() {
  if (windows) %translate([72,-1,24])
    cube([48,5,48]);
  
  // Base plate
  translate([5.5,0,0])
    cube([16*12-11,5.5,1.5]);
  
  // Top Plate
  t = .5;
  s = 5.7;
  translate([s, 0, t])
    rotate([0,22.5,0])
      cube([1.5,5.5,tl]);
  translate([s + sin(22.5)*tl, 0, t+cos(22.5)*tl])
    rotate([0,67.5,0])
      cube([1.5,5.5,tl]);
  
  translate([16*12,0,0]) mirror([1,0,0]) {
    translate([s, 0, t])
      rotate([0,22.5,0])
        cube([1.5,5.5,tl]);
    translate([s + sin(22.5)*tl, 0, t+cos(22.5)*tl])
      rotate([0,67.5,0])
        cube([1.5,5.5,tl]);
  }

  translate([24-.75,0, 1.5])
    cube([1.5, 5.5, 8*12]);
  translate([48-.75,0, 1.5])
    cube([1.5, 5.5, 8*12]);
  translate([72-3,0, 1.5]) // King Stud
    cube([1.5, 5.5, 8*12]);
  translate([72-1.5,0, 1.5]) // Jack Stud
    cube([1.5, 5.5, 6*12-1.5]);
  translate([72-1.5,0, 73.5]) // Header 1
    cube([48+3, 5.5, 1.5]);
  translate([72-1.5,0, 72]) // Header 2
    cube([48+3, 5.5, 1.5]);
  translate([72-1.5,0, 22.5]) // Sill 1
    cube([48+3, 5.5, 1.5]);
  translate([96-.75,0, 75]) // Cripple Top
    cube([1.5, 5.5, 2*12]);
  translate([96-.75-24,0, 75]) // Cripple Top
    cube([1.5, 5.5, 2*12]);
  translate([96-.75+24,0, 75]) // Cripple Top
    cube([1.5, 5.5, 2*12]);
  translate([96-.75,0, 1.5]) // Cripple Bottom
    cube([1.5, 5.5, 24-3]);
  translate([120,0, 1.5]) // Jack Stud
    cube([1.5, 5.5, 6*12-1.5]);
  translate([120+1.5,0, 1.5]) // Jack Stud
    cube([1.5, 5.5, 8*12]); // King Stud
  translate([144-.75,0, 1.5])
    cube([1.5, 5.5, 8*12]);
  translate([168-.75,0, 1.5])
    cube([1.5, 5.5, 8*12]);
}
module Inner() {

  // Lower wall
  translate([5.5+48, 53.5,0]) // base plate
    cube([5.5, 43.25+24, 1.5]);
  for (i = [3:5]) {
    translate([5.5+48, i*24-.75,1.5])
      cube([5.5, 1.5, h]);
  }
  // Inner ends
  translate([5.5+48, 53.5,1.5])
    cube([5.5, 1.5, h]);
  translate([5.5+48, 59,1.5])
    cube([5.5, 1.5, h]);
  //top plates
  translate([5.5+48, 53.5, h + 1.5])
    cube([5.5, 43.25+24, 1.5]);
  translate([5.5+48, 59, h + 3])
    cube([5.5, 37.75+24, 1.5]);
  
  // Mid wall
  translate([59, 53.5,0]) // base plate
    cube([67.5, 5.5, 1.5]);
  // Top plates
  translate([59, 53.5, h + 1.5])
    cube([67.5, 5.5, 1.5]);
  translate([53.5, 53.5, h + 3])
    cube([73, 5.5, 1.5]);
  translate([59, 53.5, 1.5]) // inner end
    cube([1.5, 5.5, h]);
  for (i = [3:5]) {
    translate([i*24-.75, 53.5, 1.5])
      cube([1.5, 5.5, h]);
  translate([125, 53.5, 1.5]) // outer end
    cube([1.5, 5.5, h]);
  }

}
module Steps() {

  for (i = [0:6]) {
    translate([0, 10*i-1.5, 7.5*i+6])
      cube([48,11.5,1.5]);
    translate([0, 10*i-1.5, 7.5*i])
      cube([48,1.5,6]);
  }
  
  difference() {
    translate([.01, -2.85, 3.85])
      rotate([-53,0,0])
        union() {
          cube([1.5,11.5,8*12]);
          translate([24-.75,0,0])
            cube([1.5,11.5,8*12]);
          translate([48-1.5,0,0])
            cube([1.5,11.5,8*12]);
        }
    for (i = [0:6]) {
      translate([-1, 10*i-1.51, 7.5*i+6-.01])
        cube([50,11.5,10]);
      translate([-1, 10*i-10.01, 7.5*i-.01])
        cube([50,10,6]);
    }
    translate([-1, 10*7-.02, 7.5*6-10])
      cube([50,30,30]);
    translate([-1, -1, -30.0])
      cube([50,30,30.01]);
  }
  
}  

module Stairs() {
    /*
Stairs
rise 105"
run 140"

14 risers (including top floor)
7.5" rise for each
run 10"
headroom opening for all but bottom 2 steps
4' wide (3 stringers at 16" centers, 2"x12"x16')

*/
  translate([0,0,1.5]) {
    translate([5.5+48,123.5,0])
      rotate([0,0,180]) {
        translate([0,-1.5,-1.5]) cube([48, 11.5,1.5]);
        Steps();
      }
    translate([5.5,5.5,105/2-9]) {
      translate([0,0,0])
        cube([60, 1.5, 7.5]);
      translate([0,48-1.5,0])
        cube([60, 1.5, 7.5]);
      translate([1.5,48-.75-24,0])
        cube([60-3, 1.5, 7.5]);
      translate([0,1.5,0])
        cube([1.5, 48-3, 7.5]);
      translate([60-1.5,1.5,0])
        cube([1.5, 48-3, 7.5]);
      for (i = [0:7]) {
        translate([7.5*i,0,7.5])
          cube([7.5,48,1.5]);
      }
    }
    translate([5.5+48+1.5, 5.5+48, 105/2])
      rotate([0,0,-90])
        Steps();
  }
}

module Top() {
  
  // Walls clipped to rafter shape
  r = 8*12-5.5;
  intersection() {
    translate([8*12,(l+.5) *12,0])
      rotate([90,0,0])
        cylinder(h=(l+1)*12, r1=r,r2=r,$fn=8);
    union() {
      TopWall();
      translate([0,l*12-3.5,0]) TopWall();
    }
  }
}

module Rafter() {
  translate([0, 0, 0])
    rotate([0,22.5,0])
      cube([5.5, 1.5, rl]);
  translate([sin(22.5)*rl, 0, cos(22.5)*rl])
    rotate([0,67.5,0])
      cube([5.5, 1.5, rl]);
  translate([16*12,0,0]) mirror([1,0,0]) {
    translate([0, 0, 0])
      rotate([0,22.5,0])
        cube([5.5, 1.5, rl]);
    translate([sin(22.5)*rl, 0, cos(22.5)*rl])
      rotate([0,67.5,0])
        cube([5.5, 1.5, rl]);
  }
}


module Rafters() {
  // Base Plates
  cube([5.5,l*12,1.5]);
  translate([16*12-5.5,0,0])
    cube([5.5,l*12,1.5]);

  Rafter();
  translate([0, 5.5, 0])
    Rafter();
  for (i = [1:l*12/24-1]) {
    translate([0, 24*i-.75, 0])
      Rafter();
  }
  translate([0, l*12-7, 0])
    Rafter();
  translate([0, l*12-1.5, 0])
    Rafter();
}
module long() {
  cube([1.5,16*12,5.5]);
  translate([0,16*12,0])
    cube([1.5,16*12,5.5]);
}


translate([0,0,-12]) Foundation();

// Lower Walls
translate([16*12-5.5,0,0]) SideWall(false, 16, 3, true);
translate([16*12-5.5,16*12,0]) SideWall(1, 16);
SideWall(5, 16, false, true);
translate([0,16*12,0]) SideWall(false, 16);
Back();
translate([0,l*12-5.5]) Front();

Inner();
Stairs();

translate([0,0,h+4.5]) UpperFloor();
translate([0,16*12,h+4.5]) FloorRafters(l-16);
translate([0,0,h+4.5+9.5]) UpperSubFloor();


translate([0,0,97.125 + 7.5]) {
 Top();
 Rafters();
 RoofSheathing();
}

if (stuff) {
  // Lawn Mower
  %translate([(16-6)*12,(l-6)*12,1])
    cube([5*12,5*12,5*12]);
    
  // Work Table
  %translate([11.5*12,7*12,1])
    cube([4*12,8*12,3*12]);

  // Tim Fat Bike
  %translate([5,l*12-30-5,12])
    cube([46,30,76]);

  // Tim Mission Bike
  %translate([5,l*12-56-5,21])
    cube([46,25,67]);

  // Mir Bike
  %translate([5,l*12-82-5,22])
    cube([44,25,66]);

  // Charlotte Trailer
  %translate([5,l*12-101,34])
    cube([30, 13, 54]);

  // Green Trailer  
  %translate([5,l*12-125,10])
    cube([25,23,38]);

  // Green Trailer
  %translate([5,l*12-125,50])
    cube([25,23,38]);
    
  // Double Trailer
  %translate([16*12-5-20,l*12-105,48])
    cube([20, 30,40]);


    
}

Just lower half for easier viewing.

Top half without rafters and perlins.

Now with variable length! Shown at 28' instead of 24'

Floors

• 2"x10"x16' (x45)
• 4'x8'x23/32" (x32) OSB or Plywood Subfloor

3 x floor rafters

This is made of 2"x10"x16' boards with 24" on center spacing. The outer boards are full length all others (including horizontal caps)
are cut with 3" off to fit on the inside.

2 are used for bottom and one for top floor.

upper floor rafters

This is a modified floor rafter square with space cut out for the stairs.

Lower Subfloor

16 sheets of subfloor tiled to cover 2x floor rafter squares.

Upper Subfloor

This is the same as lower, but with cutout for stairs.

Lower Walls

Lumber needed to build all lower walls:

• 2"x8"x8' (x2)
• 2"x6"x16' (x17)
• 2"x6"x8' (x85)

Left-Back Wall

This is the wall-segment left of the doors and touching the back of the building. It's a plain wall segment with
framing for an air conditioner.

Left-Front Wall

The next segment (left to previous when viewed from side) touching corner with door. Has window frame.

Right-Back Wall

This is the side wall touching the stairs, it also has a window opening.

Right-Front Wall

The last side wall, nothing special in this one.

Front Wall

Front-wall with opening for double doors and extra strong 2"x8" headers.

Back Wall

Simplest of the walls, a plain back wall (by stairs)

Inner Walls

These walls go on the inside and close the stairwell and add support for the upper floor rafters near the stairs cutout.

Stairs

• 2"x12"x8' (x14)
• 2"x8"x8' (x15)

Lower Steps

Platform

Upper Steps

Top

• 2"x6"x8' (x100)
• 2"x6"x16' (x38)

Top Wall (x2)

Wall extenders for ends of building.

Rafter (x19)

Each rafter is 4 angled 2x6 boards cut at 67.5 degree angles (sides of an octagon).

Perlins

I decided to go with a slab for the foundation. It only costs $500 more and saves around $800 in lumber (not to mention a lot of labor) and the end product is better.

The guys doing the slab will need to know where to put anchor bolts, this will help:

Tweaked window and door openings for new sizes and so that studs line up more often. Also removed perlins and will be putting foil lined sheathing on top instead.

Pro-tip. The foil lined sheathing really helps with cooling costs, but it destroys cell reception inside the building by making it a giant Faraday cage.

Nice! Thanks for sharing! I'm looking to build a paid of smaller sheds and am starting with design in OpenSCAD. Being new to OpenSCAD, what you've shared in this gist will be tremendously helpful. It's a great example of a way to get the design done. I'll make sure to share my design and pics too!