Structural Clarity in Timber Framing

Exposed timber framing represents an architectural discipline where structural necessity and visual form are identical. Unlike steel structures concealed behind fireproof panels, heavy timber framing reveals how dead and live loads descend through posts, beams, and diagonal braces to the foundation.

Traditional Japanese joinery (Kigumi) eliminated iron nails and adhesives in favor of interlocking wooden joints. Mortise-and-tenon connections, lap joints, and wedged keys allowed timber structures to absorb seismic vibrations without cataclysmic structural failure.

Selecting wood species for heavy timber frames involves matching grain density and shrinkage rates across load-bearing members. White oak and Douglas fir offer high bending strength and shear resistance, making them ideal for long-span roof trusses and principal posts.

{
  "joint_type": "Kanawa-tsugi (Spliced Joint)",
  "wood_species": "Quercus alba (White Oak)",
  "moisture_content_pct": 14,
  "allowable_shear_stress_mpa": 8.5,
  "seismic_damping_ratio": 0.08
}

When structural framing is left visible within interior spaces, the joinery tells a legible story of forces in equilibrium. Tension ties, compression struts, and bearing seats form an architectural rhythm that grounds the occupant in the physical reality of shelter.