# Garden shed — 8'-0" × 6'-0", freestanding on precast deck blocks. # # A deliberately different shape of job from the loft and the deck: tiny spans, # light sections, twelve posts carrying almost nothing, and a floor frame that # is DROP framed — joists over the beams rather than hung between them. That # combination exercises the parts of the engine the other two models never # touch: the tie path instead of the hanger path, post caps at every bearing, # and footings sized by block bearing rather than by load. # # WHAT THIS MODEL COVERS: the floor frame. Posts, blocks, perimeter rim, # joists, decking. # # AND NOW THE WALLS AND ROOF TOO. The engine used to model one horizontal # plane per element, so a stud wall and a sloped rafter pair had no vocabulary # in it. Both are first-class now: a wall is a vertical plane between two # points with studs at a spacing, and a roof is a pitch over a footprint whose # rafters carry a true length and cut angles the plan view cannot show. # 2by's libraries this design is checked against (docs/materials-plan.md): # no revision, so a demo always follows 2by's current ones. materials: { lumber: southern-pine, hardware: simpson } project: slug: garden-shed title: Garden Shed 8x6 revision: r5 date: 2026-09-03 live_psf: 40 # storage floor dead_psf: 8 # 2x6 joists, 3/4" decking, no finishes roof_live_psf: 20 # snow and maintenance — NOT the floor's 40 roof_dead_psf: 10 # rafters, sheathing, shingles allowable_psf: 1500 # firm undisturbed soil under precast blocks waste_pct: 10 # How the four corners are framed. 3-stud is the strongest and the most # lumber: two studs from the wall that runs through, plus the butting wall's # end stud. california turns one stud flat as drywall backing for the same # count; clips uses two studs and metal clips instead of backing. corner_style: 3-stud # Which way the orthographic views are arranged. third-angle puts the top # view above the front and the right view to the right, which is the North # American convention; first-angle swaps both pairs. The sheet states which, # because the arrangement on its own reads fine and builds wrong. projection: third-angle deck_top_ft: 1'-7" # top of decking; joists ride ON the beams phases: - id: p1 name: Floor Frame - id: p2 name: Walls and Roof # Nothing over 12' is bought for this job. This replaces a stock: block that # restated 2x4, 2x6 and 4x4 as [8, 10, 12] section by section; the cap says # the same in one line and the Findings report it once. Without it the cut # list nests the wall and roof framing into 14' stock. supply: max_stock_ft: 12 # Twelve deck blocks: four columns at 2'-8" centres, three rows at 3'-0". # Posts are trimmed on site to suit the ground, which is why every one of them # is the same nominal length in the cut list and none of them is exact. posts: - id: B1 at: [0, 0] size: 4x4 phase: p1 perimeter: true - id: B2 at: [2'-8", 0] size: 4x4 phase: p1 perimeter: true - id: B3 at: [5'-4", 0] size: 4x4 phase: p1 perimeter: true - id: B4 at: [8, 0] size: 4x4 phase: p1 perimeter: true - id: B5 at: [0, 3] size: 4x4 phase: p1 perimeter: false - id: B6 at: [2'-8", 3] size: 4x4 phase: p1 perimeter: false - id: B7 at: [5'-4", 3] size: 4x4 phase: p1 perimeter: false - id: B8 at: [8, 3] size: 4x4 phase: p1 perimeter: false - id: B9 at: [0, 6] size: 4x4 phase: p1 perimeter: true - id: B10 at: [2'-8", 6] size: 4x4 phase: p1 perimeter: true - id: B11 at: [5'-4", 6] size: 4x4 phase: p1 perimeter: true - id: B12 at: [8, 6] size: 4x4 phase: p1 perimeter: true # Three 8'-0" runs carry the joists; the two 6'-0" runs are the short floor # edges and carry nothing but themselves and the decking edge. beams: - id: EDGE-N label: Long floor edge, north axis: x supports: [B1, B2, B3, B4] plies: 1 section: 2x6 trib_ft: 1.125 bearing_ft: 0'-8" phase: p1 # A continuous joist puts most of its load on the centre beam, so the two # edges run at single-figure utilisation. 2x6 is not oversizing here — it # is the shallowest member a 2x6 joist can bear on and still be nailed. waive: [low-util] - id: MID label: Centre floor beam axis: x supports: [B5, B6, B7, B8] plies: 1 section: 2x6 trib_ft: 3.75 bearing_ft: 0'-8" phase: p1 - id: EDGE-S label: Long floor edge, south axis: x supports: [B9, B10, B11, B12] plies: 1 section: 2x6 trib_ft: 1.125 bearing_ft: 0'-8" phase: p1 waive: [low-util] # Drop framing puts the rims at JOIST level — they are nailed to the joist # ends, not hung between the beams — so they are stated by top elevation # rather than by bearing. - id: RIM-W label: Short floor edge, west axis: y supports: [B1, B5, B9] plies: 1 section: 2x6 trib_ft: 0 top_ft: 1'-7" phase: p1 waive: [low-util] - id: RIM-E label: Short floor edge, east axis: y supports: [B4, B8, B12] plies: 1 section: 2x6 trib_ft: 0 top_ft: 1'-7" phase: p1 waive: [low-util] # bounds_x / bounds_y are beam CENTRELINES here, as they are everywhere in # this format. So the 8'-0" x 6'-0" in the title is the WALL footprint — the # outside of the sheathing — and the floor frame under it measures 6'-1-1/2" # on the span, because a drop joist runs out over its rim to the rim's outside # face. The floor therefore oversails the walls by 3/4" at each rim, which is # the lap the siding wants. Decking and the sheet count follow the frame, not # this footprint: DECK AREA reads 49 sf, not 48. # # Drop framed: joists sit ON all three long runs, so each joist crosses the # centre beam as a two-span member and gets a tie at every bearing — three per # joist, not two. Nothing is hung, so there is not a hanger in this job. # A two-span joist puts about 5/8 of the load on the centre beam and 3/8 split # between the edges, which is why the tributary widths are 1-1/8 / 3-3/4 / # 1-1/8 rather than an even third each. joist_fields: - id: FLOOR label: Shed floor section: 2x6 span_axis: y bounds_x: [0, 8] bounds_y: [0, 6] framing: drop spacing_in: 16 tie: H2.5A waive: [low-util] # the birdsmouth governs this section, not bending bears_on: [EDGE-N, MID, EDGE-S] blocking: false phase: p1 # Every bearing is a post cap: the beam sits on the end grain of a 4x4 and the # cap resists uplift and lateral only. BC4 is the one-piece cap — 605 lb # uplift, which for a shed on blocks is a wind question, not a load question. connections: - at: B1 member: EDGE-N type: cap part: BC4 - at: B2 member: EDGE-N type: cap part: BC4 - at: B3 member: EDGE-N type: cap part: BC4 - at: B4 member: EDGE-N type: cap part: BC4 - at: B5 member: MID type: cap part: BC4 - at: B6 member: MID type: cap part: BC4 - at: B7 member: MID type: cap part: BC4 - at: B8 member: MID type: cap part: BC4 - at: B9 member: EDGE-S type: cap part: BC4 - at: B10 member: EDGE-S type: cap part: BC4 - at: B11 member: EDGE-S type: cap part: BC4 - at: B12 member: EDGE-S type: cap part: BC4 # ═══════════════ PHASE 2 — WALLS AND ROOF ═══════════════ # # Walls sit on the floor deck at 1'-7" and run to 9'-11-1/2", which is 8'-4-1/2" # of wall: one bottom plate, two top plates, and studs at a clean 8'-0" so they # come out of stock uncut. # # The two long walls carry the roof. The two short ones are gable ends — they # carry nothing but their own sheathing, and their tops follow the rake, so # every stud in them is a different length. walls: - id: W-N label: North wall from: [0, 0] to: [8, 0] align: outside # the line IS the outside face: body sits on the deck bearing: true # rafters land here bottom_ft: 1'-7" top_ft: 8'-7-1/2" section: 2x4 spacing_in: 24 top_plates: 2 # overlapped at the corners, per the drawing bottom_plates: 1 sheathing: 7/16" OSB housewrap: true cladding: board and batten phase: p2 - id: W-S label: South wall from: [0, 6] to: [8, 6] align: outside bearing: true bottom_ft: 1'-7" top_ft: 8'-7-1/2" section: 2x4 spacing_in: 24 top_plates: 2 bottom_plates: 1 sheathing: 7/16" OSB housewrap: true cladding: board and batten phase: p2 - id: W-W label: West gable end from: [0, 0] to: [0, 6] align: outside bearing: false # gable end: carries its own sheathing only bottom_ft: 1'-7" top_ft: 8'-7-1/2" section: 2x4 spacing_in: 24 top_plates: 2 # doubled like the long walls; the upper plate is # the SHORT one at the corners, lapped by the long # wall that runs through bottom_plates: 1 gable: ROOF # top follows the rake of this roof sheathing: 7/16" OSB housewrap: true cladding: board and batten phase: p2 - id: W-E label: East gable end from: [8, 0] to: [8, 6] align: outside bearing: false bottom_ft: 1'-7" top_ft: 8'-7-1/2" section: 2x4 spacing_in: 24 top_plates: 2 # doubled, as W-W bottom_plates: 1 gable: ROOF sheathing: 7/16" OSB housewrap: true cladding: board and batten phase: p2 # All four walls are doubled at the top and every wall top lands at the same # 8'-7-1/2". The gable ends were single-plated, which left their plate underside # 1-1/2" above the long walls' and put a step in every corner of the ISO. # # Wall height: 6'-8" studs, so bottom plate + stud + two top plates is # 7'-0-1/2" and the top of wall lands at 8'-7-1/2" over a floor that is # already 1'-7" up on blocks. The first cut of this model used 8'-0" studs # because they come out of stock uncut — which gave a 6x8 shed with nearly # ten feet of wall. Stock yield is not a reason to draw a phone booth. # # Gable roof, ridge along the 8'-0" length, rafters spanning the 6'-0" width. # # The drawing gives a 52-1/2" rafter with a 10" overhang and 30-degree cuts, # which works back to about 6.9 in 12. Declared as 7 in 12 — the nearest pitch # a framing square actually has — from which the tool derives a 53-1/4" rafter # at 30.3 degrees. If you want the drawing's exact 52-1/2", change pitch to 6.5 # and the whole schedule follows. roof: - id: ROOF label: Gable roof type: gable ridge_axis: x bounds_x: [0, 8] bounds_y: [0, 6] pitch: 7 # rise in 12 # 2x6 rather than 2x4: seating a rafter on a 3-1/2" plate at 7 in 12 # removes 1-3/4" of its depth, which is more than a third of a 2x4 and # leaves too little heel. Bending is nowhere near the governing case here # — the birdsmouth is. section: 2x6 spacing_in: 24 overhang_in: 10 # eave, across the rafter run rake_overhang_in: 6 # gable end, along the ridge ridge_section: 2x6 support_section: 2x4 # 2x4, not the 2x3 on the old drawing: 2x3 is not # a section this yard stocks, so the cut list was # nesting it against a length nobody sells. blocking: true # top edge cut to the pitch angle bears_on: [W-N, W-S] tie: H2.5A waive: [low-util] # the birdsmouth governs this section, not bending sheathing: 7/16" OSB roofing: asphalt shingle phase: p2 # at_ft places an opening along its wall, measured from that wall's from end to # the CENTRE of the rough opening. Leave it out and the tool centres the # opening and says so — fine for one door, wrong the moment a wall has two. openings: - id: DOOR label: Door opening in_wall: W-E kind: door at_ft: 3 # centre of the opening, from the wall's from end width_in: 36 height_in: 74 clear_width_in: 36 min_width_in: 32 - id: WINDOW label: Window opening in_wall: W-N kind: window at_ft: 2 # near the west end, off the door wall width_in: 24 height_in: 24 sill_in: 42 # Fastening from the drawing: frame joints two 3-1/2" nails, sheathing 2-1/2" # nails, floor decking 2-1/2" deck screws.