If you’re building or repairing a backyard structure, one of the most common questions we hear at Onlyroofing is what thickness plywood for shed roof projects. Choosing the right thickness affects durability, load capacity, and how well your roof holds up against weather over time.
Recommended Plywood Thickness for Shed Roofs
So, what thickness plywood for shed roof construction should you actually use? In most cases, the answer depends on rafter spacing and roof load:
- 3/8 inch (9.5mm) — acceptable for light-duty sheds with rafters spaced 16 inches apart
- 1/2 inch (12.7mm) — a solid mid-range option for most standard sheds and rafters up to 24 inches apart
- 5/8 inch (15.9mm) — recommended for larger sheds, heavier roofing materials, or areas with snow loads
- 3/4 inch (19mm) — best for walkable roofs or sheds doubling as storage lofts
Generally, ½ inch plywood is the sweet spot for most standard shed roofs, balancing cost, strength, and ease of installation.
Plywood vs. OSB for Shed Roofs
Many builders debate plywood versus OSB (oriented strand board) for roof sheathing. Both work well, but they have different moisture resistance and installation properties. If you’re weighing your options, it’s worth reading our guide on what thickness OSB for roof projects, or check whether you can use 7/16 OSB for roof sheathing instead of plywood.
Factors That Affect Plywood Thickness Choice
- Roof slope — steeper roofs may allow thinner plywood since water drains faster
- Local climate — snow and heavy rain regions often need thicker sheathing
- Roofing material weight — shingles, metal, or membrane roofing all add different loads
- Rafter spacing — wider spacing requires thicker plywood for structural support
If you’re finishing your shed with a flat or low-slope membrane roof, understanding sealing TPO roofs and what to know can also help protect your investment long-term.
Final Thoughts
Knowing what thickness plywood for shed roof projects require can save you time, money, and future repairs. For personalized recommendations based on your shed size and roofing material, Onlyroofing is here to help you build it right the first time.
