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Woodshop Math

Project plan · Storage

Garage Wall Shelving: Timber Frame and OSB Shelf Plan

Four 2400 × 600 mm shelves on wall ledgers and 3 front posts, framed in 90 × 45 mm timber and decked with 18 mm OSB. The OSB count matches the Project Planner.

AUSV Systems

Calculated plan · Last updated

4501000155021002400 mmmm
Difficulty
Beginner
Time
1 day
Shelves
4 × 2400 × 600 mm
Height
2100 mm
Est. cost
≈ $322

Cut list

PartQtySize L × W × T (mm)Material / source
Wall ledgerScrewed to the wall studs42400 × 90 × 4590 × 45 mm framing2.4 m length
Front rail42400 × 90 × 4590 × 45 mm framing2.4 m length
Cross memberFive per shelf at 600 mm centres20510 × 90 × 4590 × 45 mm framing2.4 m length
Front postAt each end and the centre32100 × 90 × 4590 × 45 mm framing2.4 m length
Shelf deck42400 × 600 × 1818 mm OSBSheets 1 and 2

Kerf allowance: 3 mm per cut.

Layout

Shelf deck2400 × 600Shelf deck2400 × 600Sheet 1 · 18 mm OSB2440 × 1220 mm
Sheet 1: 2 parts, 97% of the sheet used. Hatched area is offcut.
Shelf deck2400 × 600Shelf deck2400 × 600Sheet 2 · 18 mm OSB2440 × 1220 mm
Sheet 2: 2 parts, 97% of the sheet used. Hatched area is offcut.
× 4Wall ledger2,400 mmoffcut 0 mm× 4Front rail2,400 mmoffcut 0 mm× 3Front post2,100 mmoffcut 300 mm× 5Cross member510 mmCross member510 mmCross member510 mmCross member510 mmoffcut 351 mm
16 × 90 × 45 × 2.4 m, allocated by the Cut List Optimizer. Hatched area is offcut.

How the numbers were checked

Project Planner, shelving
Four 2400 × 600 mm shelves, rotation allowed: 2 per 2440 × 1220 sheet, 2 sheets.
Framing allocation
Cut List Optimizer with a 3 mm kerf: 16 lengths of 2.4 m.
Shelf levels
Frame tops at 450, 1000, 1550, 2100 mm above the floor.

Build steps

  1. Find the studs

    Locate and mark every stud along the wall. The plan assumes studs at 450 mm centres, giving 6 fixings per ledger; adjust if your wall differs.

  2. Cut the framing

    Cut the 90 × 45 mm framing as shown in the allocation: ledgers and front rails at full 2400 mm length, 3 posts at 2100 mm and 20 cross members at 510 mm.

  3. Fix the ledgers

    Mark the shelf levels at 450, 1000, 1550, 2100 mm, check them with a level and fix each ledger to every stud with two screws suited to the wall construction.

  4. Build the front frame

    Fix the front rails to the posts at matching levels, then stand the front frame up and join it to the ledgers with the cross members at about 600 mm centres.

  5. Deck the shelves

    Rip each OSB sheet into two 600 mm strips and crosscut them to 2400 mm. Screw the decks to the ledgers, rails and cross members.

Assumptions

  • Unit prices are assumed 2026 retail figures in US dollars for illustration only, not supplier quotes. Replace them with local prices before budgeting.
  • Framing is 90 × 45 mm structural timber; OSB is 18 mm. Measure your stock before cutting.
  • Wall studs are assumed at 450 mm centres for the fixing count.

Safety and scope

  • This is not engineering advice. Shelf load capacity has not been calculated; it depends on timber grade, spans, fixings and the wall itself. Check local span tables or ask a qualified person before storing heavy items.
  • Fix ledgers into studs or solid framing only, never into plasterboard alone, and use fixings rated for the wall material.
  • Keep the heaviest items on the lowest shelf and check fixings periodically.
  • Planning estimates only — verify before you buy or build. Read the disclaimer.
Quantity basis for each material
90 × 45 mm framing timber, 2.4 m
Length count from the cut list optimizer allocation below.
18 mm OSB, 2440 × 1220 mm
Project Planner sheet count: two shelf decks per sheet.
75 mm framing screws, box of 200
104 screws: 80 for cross-member ends (2 each) and 24 for rail-to-post joints.
Structural screws for ledger-to-stud fixing, box of 50
48 screws: 4 ledgers × 6 studs at 450 mm centres × 2, plus 5% spare = 51. Choose a type rated for your wall.
40 mm screws for the OSB decks, box of 200
112 screws at 300 mm along the ledger and front rail plus 2 per cross member.