ud83dudcda Wood Deck Build Log u2014 12 of 45
u2190 Roof Material Pt.2 u00b7 Series Index u00b7 Structural Design Pt.2: Deck Board Fastening u2192
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2026 Note from DIY Dad: Structural Design Overview
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Once the materials were chosen, the next step is structural design — deciding what structure to build, how the roof interfaces with the building, and what to do about railings.
Basic Structure of a Wood Deck
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- Footing (束石): placed on the ground as a foundation
- Post (束柱): stands on the footing
- Beam (大引き): laid across the posts along the long axis
- Floor joist (根太): laid across the beams, supporting the decking
- Decking board: surface material fastened to the joists
I chose a free-standing roof structure and a fence-style railing using the same decking board material for a consistent look.
Originally published: 2017-04-21. All decking materials were finalized:
- Decking material: SPF
- Structural frame: Super Light 700 steel pipe
- Roofing: polycarbonate corrugated roofing
Now to plan the structural design. All structural members (columns, beams, floor joists, large beams, rafters, purlins) use Super Light 700. Joints between pipes use dedicated pipe couplers — right-angle couplers (直交クランプ) and swivel couplers (自在クランプ):
↑ Right-angle pipe coupler (直交クランプ)
↑ Swivel pipe coupler (自在クランプ)
Structural framework concept:
↑ Structural framework concept
No issues so far. I will leave the strength calculations for columns and beams for a later step and move forward.
ud83dudcda Wood Deck Build Log u2014 12 of 45
u2190 Roof Material Pt.2 u00b7 Series Index u00b7 Structural Design Pt.2: Deck Board Fastening u2192
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15 years of landlord experience u00b7 3 apartment buildings u00b7 DIY renovations that saved millions of yen. Browse all articles at diytosan.com
