Reviewed 3 min read4 primary sourcesVersion 1.3
Written and reviewed by Pergola Wiki Editorial TeamSee editorial method and revision history
Continuous pergola load path from roof action to soil resistance
A complete claim traces actions through components, connections, anchors and foundations. Original diagram by Pergola Wiki.
Read a detailed text description

The diagram follows gravity, wind uplift and lateral actions from the roof surface into rafters or louvers, beams and posts. It continues through every connection, base plate and anchor into the foundation and finally the supporting soil, emphasizing that one weak or undocumented link interrupts the claimed structural path.

Key takeaways

  • Check load direction and eccentricity.
  • Protect against incompatible-metal corrosion.
  • Installation torque is not a universal design value.

On this page

  1. Connection behavior
  2. Inspection
  3. Connection capacity has multiple limit states
  4. Inspection requires a defined method

Connection behavior

Bolts, screws, welds and anchors transfer force through different mechanisms. Thin aluminum walls, timber end distance, steel plate bending and concrete breakout can each govern before the fastener itself fails.

Inspection

Connections should be visible or accessible where possible. Look for movement marks, loose hardware, split timber, cracked grout, coating damage and water traps, especially after severe weather.

Source tier 2Source-register entry
The Aluminum Association — Aluminum Design Manual 2020
Structural aluminum design reference cited by the International Building Code.

Connection capacity has multiple limit states

A bolt or screw can be strong while the connected sheet tears, bearing deforms, a thin wall crushes, an edge splits or the substrate pulls out. Design and review therefore need the complete joint geometry, material thickness, hole type, edge distances, slip expectations and installation method—not only fastener diameter.

Inspection requires a defined method

Torque is not a universal proxy for clamp force, especially with self-drilling screws, polymer washers or slotted holes. State which connections receive torque verification, witness marks or visual checks and when they are rechecked. Repeated loosening signals movement or joint design issues; adding thread-locker without diagnosing the cause can hide the warning.

Source tier 3Source-register entry
USDA Forest Products Laboratory — Wood Handbook — Wood as an Engineering Material
Government technical reference on wood properties, moisture, decay, fasteners and design.

Primary sources and scope

Source tier 2Source-register entry
The Aluminum Association — Aluminum Design Manual 2020
Structural aluminum design reference cited by the International Building Code.
Source tier 3Source-register entry
USDA Forest Products Laboratory — Wood Handbook — Wood as an Engineering Material
Government technical reference on wood properties, moisture, decay, fasteners and design.
Source tier 2Source-register entry
American Wood Council — 2024 National Design Specification for Wood Construction
ANSI-approved wood design standard referenced by 2024 US model codes.
Source tier 2Source-register entry
American Society of Civil Engineers — ASCE/SEI 7-22 — Minimum Design Loads and Associated Criteria
Official standard hub for US structural actions including wind, snow, rain, seismic and load combinations.

Cite this page

Pergola Wiki Editorial Team. “Fasteners and structural connections.” Pergola Wiki. Reviewed 24 July 2026. https://pergola.wiki/articles/fasteners-connections/

Professional boundary: This article cannot replace a site investigation, project-specific manufacturer documentation, structural calculations or the authority having jurisdiction.
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