# Pergola Wiki > An independent, bilingual, evidence-led educational reference for pergola terminology, materials, structural actions, drainage, planning pathways, maintenance and evidence quality. Public release 2.2, released 2026-07-25; evidence-content and claim datasets 1.7, reviewed 2026-07-25. The site is not a code-adoption database, project approval, product certification, engineering calculation or substitute for a qualified professional. All 44 topics have internal editorial review; independent external review is not recorded for any topic. ## Start here - [What is a pergola?](https://pergola.wiki/what-is-a-pergola/): Definition, classification boundaries and a route into the knowledge base. - [All topics](https://pergola.wiki/articles/): Complete directory of 44 bilingual technical topics. - [Glossary](https://pergola.wiki/glossary/): 62 bilingual technical terms. - [Sources](https://pergola.wiki/sources/): 40 official, standards, government, research and technical source records with scope notes. - [Source governance](https://pergola.wiki/source-governance/): 40 lifecycle records, dated retrieval checks, next-review dates and explicit HTTP-status limits. ## Evidence and methods - [Editorial methodology](https://pergola.wiki/methodology/): Evidence hierarchy, editorial rules and update policy. - [Bilingual claim register](https://pergola.wiki/claim-register/): 132 stable claims with exact article anchors and explicit evidence limits. - [Research data catalog](https://pergola.wiki/research-data/): Versioned JSON, CSV, JSON-LD and workflow files. - [Independent review protocol](https://pergola.wiki/review-protocol/): Public status ledger; zero independent external reviews are recorded. - [Reviewer workbench](https://pergola.wiki/reviewer-workbench/): Local-only structured review packet preparation. - [How to cite](https://pergola.wiki/citation/): CFF, BibTeX, RIS and CSL JSON formats and version semantics. - [Release integrity](https://pergola.wiki/release-integrity/): Machine-readable release identity and SHA-256 manifest. - [Corrections](https://pergola.wiki/corrections/): Structured reporting workflow and zero-record public material-correction log. - [Public quality dashboard](https://pergola.wiki/quality-dashboard/): Build-derived source coverage, review, correction and accessibility-status metrics with explicit limits. - [Disclosure](https://pergola.wiki/disclosure/): Editorial separation and the disclosed Oscar Pergola industry link. - [Accessibility](https://pergola.wiki/accessibility/): Accessibility features, tests and known limits. - [Accessibility evaluation](https://pergola.wiki/accessibility-evaluation/): 55-criterion WCAG 2.2 A/AA evidence-coverage matrix, dated automated audit and outstanding human checks; no formal conformance claim. ## Topic index - [Traditional open-rafter pergolas](https://pergola.wiki/articles/traditional-open-rafter/): An open-rafter pergola creates partial shade through spaced overhead members rather than a weather-tight roof. - [Louvered and bioclimatic pergolas](https://pergola.wiki/articles/louvered-bioclimatic/): Rotating louvers can modulate sun, ventilation and rain shedding, but performance depends on tested system details and correct drainage. - [Fixed-roof pergolas and patio covers](https://pergola.wiki/articles/fixed-roof/): A permanent solid or glazed roof provides weather cover but often places the structure in a different code and drainage category from an open pergola. - [Retractable canopy pergolas](https://pergola.wiki/articles/retractable-canopy/): A retractable fabric canopy adds adjustable shade while preserving an open frame, but fabric, tracks, drainage and wind procedures require coordinated maintenance. - [Attached vs freestanding pergolas](https://pergola.wiki/articles/attached-vs-freestanding/): An attached pergola transfers some loads to an existing building, while a freestanding pergola relies on its own frame and foundations. - [Aluminum pergola structures](https://pergola.wiki/articles/aluminum/): Aluminum offers low mass and corrosion resistance, but alloy, temper, extrusion geometry, connections and weld effects determine structural capacity. - [Timber and wood pergolas](https://pergola.wiki/articles/timber/): Wood can create expressive, repairable structures, but species, grade, moisture, durability, detailing and maintenance control performance. - [Steel pergola structures](https://pergola.wiki/articles/steel/): Steel provides high stiffness and connection versatility, but corrosion protection and water-shedding details must match the exposure. - [Vinyl and composite pergolas](https://pergola.wiki/articles/composite-vinyl/): Vinyl and composite products can reduce surface maintenance, but many systems rely on concealed metal or timber reinforcement for structural work. - [Posts, beams and rafters](https://pergola.wiki/articles/posts-beams-rafters/): The primary frame creates a continuous path from roof or shade elements through beams and posts into foundations. - [Louvers, gutters and concealed drainage](https://pergola.wiki/articles/louver-gutter-drainage/): A louvered roof manages water as a chain: blade joints, frame channels, gutters, downpipes, outlets and final discharge. - [Foundations and anchors](https://pergola.wiki/articles/foundations-anchors/): Pergola foundations resist compression, uplift, sliding and overturning; a slab alone is not automatically an adequate footing. - [Fasteners and structural connections](https://pergola.wiki/articles/fasteners-connections/): Connection capacity depends on the exact fastener, base material, geometry, installation and exposure—not simply bolt diameter. - [Wind load, uplift and lateral stability](https://pergola.wiki/articles/wind-load-uplift/): Pergolas must resist pressure, suction, uplift and lateral actions based on site wind climate, exposure, height, geometry and openings. - [Snow and ice actions](https://pergola.wiki/articles/snow-load/): Where snow can accumulate, the governing snow action may exceed minimum roof live-load assumptions and can be affected by drift and sliding. - [Seismic considerations](https://pergola.wiki/articles/seismic/): Seismic design for a pergola focuses on mass, anchorage, frame ductility, connection behavior and interaction with attached buildings. - [Deflection and serviceability](https://pergola.wiki/articles/deflection-serviceability/): A structure can be strong enough yet perform poorly if movement disrupts drainage, glazing, seals, doors, screens or user comfort. - [Motors, controls and electrical safety](https://pergola.wiki/articles/electrical-motorization/): Motorized louvers, screens and lighting require outdoor-rated equipment, safe isolation, coordinated drainage and local electrical compliance. - [Coastal and corrosive environments](https://pergola.wiki/articles/coastal-corrosion/): Salt, humidity, pollutants and persistent wetting can accelerate attack on coatings, fasteners, cut edges and dissimilar-metal interfaces. - [Solar orientation and shading](https://pergola.wiki/articles/solar-orientation/): Pergola shade changes by latitude, season, time, orientation and overhead-member geometry, so design should start with the sun path rather than a fixed recipe. - [Rain, overflow and site drainage](https://pergola.wiki/articles/rain-drainage/): A weather-covering pergola must collect, convey, overflow and safely discharge water without directing it into foundations or the building envelope. - [United States permits and model codes](https://pergola.wiki/articles/permits-us/): US requirements depend on the locally adopted code, amendments, zoning and the authority having jurisdiction; an ICC model-code page is not itself a local permit. - [Eurocodes and European projects](https://pergola.wiki/articles/eurocodes/): Eurocodes provide a common structural design framework, but national annexes, local law, product rules and approval procedures remain essential. - [Pergola planning in the United Kingdom](https://pergola.wiki/articles/uk-planning/): Some domestic pergolas may fall within permitted-development limits, but location, dimensions, listed status and local constraints can require permission. - [Pergolas and the Australian NCC](https://pergola.wiki/articles/australia-ncc/): Australian requirements depend on the NCC, state or territory variations, local planning rules and how the proposed structure is classified. - [Pergola vs gazebo, pavilion and patio cover](https://pergola.wiki/articles/pergola-vs-gazebo-pavilion-patio-cover/): The names overlap in ordinary speech, but roof condition, enclosure, attachment and legal definitions create materially different systems. - [Structural load path: roof to soil](https://pergola.wiki/articles/structural-load-path/): A reliable pergola needs a continuous, inspectable route for gravity, uplift and lateral actions through every connection to the supporting ground or building. - [Waterproof, water-resistant and rain-shedding claims](https://pergola.wiki/articles/waterproof-vs-water-resistant/): Rain performance is a system claim defined by configuration, intensity, wind, duration, drainage and acceptable leakage—not by one word. - [Product evidence and procurement checklist](https://pergola.wiki/articles/product-evidence-checklist/): A disciplined submittal separates marketing, tested evidence, engineering calculations, project drawings, installation records and warranties. - [Service-life and maintenance planning](https://pergola.wiki/articles/service-life-planning/): A pergola is a system of components with different inspection, maintenance and replacement cycles; design life is not a warranty. - [Canada: NBC and local approval pathway](https://pergola.wiki/articles/canada-nbc/): Canada's National Building Code is a model code; provincial, territorial and municipal adoption and permit requirements determine the project rules. - [Fire, clearances and egress around pergolas](https://pergola.wiki/articles/fire-clearance-egress/): Outdoor structures can affect fire separation, openings, combustible surfaces, grills, heaters and escape paths even when the frame itself is small. - [Pergola history and evolution](https://pergola.wiki/articles/history-and-evolution/): A source-led timeline from projecting garden framework and vine support to engineered shade, roof and operable-louver systems. - [Pergola size, layout and clearance planning](https://pergola.wiki/articles/size-layout-and-clearances/): A user-first method for converting furniture, circulation, shade, drainage and approval constraints into a defensible pergola layout. - [Lighting, heating and electrical integration](https://pergola.wiki/articles/lighting-heating-and-electrical-integration/): Plan outdoor power, lighting, controls, fans and heaters as maintainable systems without hiding electrical risk inside pergola structure. - [Climbing plants and structural care](https://pergola.wiki/articles/climbing-plants-and-structural-care/): Use vines for shade and garden character while protecting drainage, finishes, movement, inspection access and the structure’s verified load path. - [Pergola troubleshooting and warning signs](https://pergola.wiki/articles/troubleshooting-common-failures/): A symptom-led triage guide for leaks, movement, noise, corrosion, drainage, motors and finishes—with clear stop-use boundaries. - [Pergola budget and lifecycle cost](https://pergola.wiki/articles/budget-and-lifecycle-cost/): Compare pergola quotations by scope, evidence, risk, maintenance and replacement cycles instead of relying on an unqualified headline price. - [Accessible and inclusive pergola design](https://pergola.wiki/articles/accessible-and-inclusive-pergola-design/): A jurisdiction-aware framework for accessible routes, stable surfaces, clear approaches, controls, furniture and dignified outdoor use. - [Sustainability and circular pergola design](https://pergola.wiki/articles/sustainability-and-circular-design/): A lifecycle evidence framework covering material claims, service life, repair, passive performance, disassembly and end-of-use decisions. - [Severe-weather operation and emergency planning](https://pergola.wiki/articles/severe-weather-operation-and-emergency-planning/): A pre-event, evacuation and post-event framework for wind, hail, snow, heavy rain and lightning without treating a pergola as safe shelter. - [New Zealand pergola consent and Building Code pathway](https://pergola.wiki/articles/new-zealand-pergola-consent-and-building-code/): A source-led explanation of New Zealand's unroofed-pergola exemption, the effect of adding a roof and the compliance duties that remain. - [Heat, shade and outdoor thermal comfort](https://pergola.wiki/articles/heat-shade-and-outdoor-thermal-comfort/): A climate- and user-aware framework for shade geometry, radiant heat, air movement, vegetation, controls and extreme-heat operations. - [Wildfire ember exposure and pergola risk](https://pergola.wiki/articles/wildfire-ember-exposure-and-pergola-risk/): A source-led framework for assessing embers, radiant heat, flame contact, combustible attachments, vegetation and operational controls around pergolas. ## Optional machine files - [Expanded machine guide](https://pergola.wiki/llms-full.txt) - [Atom feed](https://pergola.wiki/feed.xml) - [Chinese Atom feed](https://pergola.wiki/zh/feed.xml) - [OpenSearch description](https://pergola.wiki/opensearch.xml) - [Sitemap](https://pergola.wiki/sitemap.xml) This file follows the llms.txt proposal for systems that choose to support it. Its presence is not a search-ranking signal, endorsement or guarantee of ingestion.