Fixed-slat pergola
Rafters or slats set at a fixed angle and spacing. Gives partial shade and a strong architectural look at the lowest cost, but no rain protection.
Outdoor living structures
Aluminium Pergola Systems
An aluminium pergola is an outdoor frame of posts and beams with a roof of fixed slats, rotating louvers or a solid or translucent cover, built to shade a patio, terrace, poolside or restaurant seating area. Powder-coated 6063 aluminium does not rust, rot or need repainting, and its extrusions carry integrated gutters, wiring channels and fixing grooves. Metline supplies pergola profiles, louver blades and accessories to pergola makers, dealers and installers worldwide.
- Profile alloy
- 6063-T5 / T6
- Roof types
- Slatted, louvered, solid, glazed
- Drive
- Manual crank or motor
- Mounting
- Freestanding or wall-mounted
What is an aluminium pergola?
A pergola is an open-sided garden structure: four or more posts carrying perimeter beams and a roof. Traditionally the roof was an open timber lattice for climbing plants. Modern aluminium pergolas keep the shape but turn the roof into a working element, from fixed sunshade slats to motor-driven louvers that close tight against rain.
Aluminium has largely replaced timber and steel for premium pergolas. It does not rot, split or rust, so the structure keeps its finish with little more than washing. Extrusion lets the beam be a gutter, a cable duct and a structural member at once, so rainwater can run from the roof into the beams and down inside the posts, with no visible downpipes. And a kit of light, pre-machined profiles can be shipped flat and assembled by two installers in a day.
Today the term "aluminium pergola" usually means a louvered or bioclimatic pergola, where the roof blades rotate to control sun, airflow and rain. Fixed-slat and solid-roof versions remain popular where budget is tight or where full rain cover is needed at all times.
Types of aluminium pergola roof
Louvered (bioclimatic) pergola
Aluminium blades rotate, typically through 0 – 90° or more, by crank or motor. Open for light and airflow, angled for shade, closed to shed rain into the beam gutters.
Retractable louvered roof
Blades that both rotate and slide back to stack at one end, opening the roof fully to the sky. See retractable louvered roof pergolas.
Solid-roof pergola
Insulated sandwich panels or flat aluminium sheet give permanent rain and sun cover; often used as a patio cover or carport.
Glazed or polycarbonate roof
Laminated glass or multi-wall polycarbonate keeps rain out but lets light in, close to a veranda or sunroom.
Fabric canopy pergola
Retractable fabric on an aluminium frame for light, flexible shade at lower cost.
Components of a louvered pergola
| Component | Typical section (indicative) | Function |
|---|---|---|
| Posts | Square hollow 100 × 100 to 150 × 150 mm, wall 1.5 – 3 mm | Carry the roof to the base plates; hide downpipes and cables |
| Perimeter beams | Box or gutter beams about 150 – 220 mm deep | Span between posts, collect rainwater, house drive and lighting |
| Louver blades | About 160 – 220 mm wide, 1.2 – 2.0 mm wall, flat, curved or double-skin | Rotate for shade, ventilation and rain cover |
| Blade pivots and drive rod | Aluminium or stainless pins with polymer bushes | Link all blades so they rotate together |
| Drive | Manual crank gearbox or linear / tubular motor | Opens and closes the roof |
| Base plates and brackets | Aluminium plate with stainless anchors | Fix posts to a slab, footing or deck; fix beams to a wall |
| Gutters, spouts and end caps | Extruded or cast aluminium | Drain the roof and close profile ends |
| Options | LED strips, rain sensor, heaters, side screens, glass walls | Extend use into evenings and cooler seasons |
Section sizes vary between systems; heavier sections allow longer spans and higher wind and snow ratings. Engineering data for the chosen system and site must confirm the final layout.
Profiles are extruded mainly from 6063 aluminium in T5 or T6 temper, chosen for its smooth surface under powder coat. 6063-T6 has a typical yield strength of about 214 MPa (minimum 170 MPa in thin sections); long-span beams may be made in thicker walls, deeper sections or 6005A-T6 to limit deflection.
Spans, wind and snow: what decides the size
A pergola is a light structure with a large roof area, so wind is the main design load in most regions. A closed louvered roof also catches snow, and rain must drain fast enough not to overflow the gutters. Loads are taken from the national code for the site: ASCE 7 in the United States, EN 1991-1-3 (snow) and EN 1991-1-4 (wind) in Europe, and equivalent codes elsewhere.
| Factor | Design point |
|---|---|
| Span between posts | Single roof modules are commonly up to about 4 – 4.5 m in blade length and 6 – 7 m in beam length; larger areas are built as joined modules with shared posts |
| Wind | Uplift on closed blades and sway of freestanding posts; side screens add wind load and must retract or be rated for it |
| Snow | Blades should be opened before heavy snow if the system is not rated to carry it closed; check the published snow rating |
| Rain | Gutter capacity and post downpipe size for local rainfall intensity; clear leaves and debris |
| Foundations | Anchors into a reinforced slab or individual footings; timber decks usually need extra blocking or steel |
| Wall-mounted | The wall and its fixings carry half the roof; confirm the wall can take the load |
Manual or motorised louvers?
| Feature | Manual crank | Motorised |
|---|---|---|
| Operation | Crank handle and gearbox at a post | Remote, wall switch or home-automation control |
| Cost | Lower | Higher (motor, controller, wiring) |
| Typical size | Smaller residential units | Any size, including multi-module |
| Automation | None | Rain sensor closes the roof; wind sensor opens blades; timers |
| Power | None needed | Mains supply to the post, often 24 V motor via transformer |
| Best for | Budget residential, remote sites | Hotels, restaurants, premium homes |
Motors and controls should carry the safety marking required in the destination market and be rated for outdoor use (IP65 or better is typical). Plan the power supply before the slab is poured so the cable can rise inside a post.
Finishes, colours and side systems
Powder coating
The standard finish: polyester or super-durable powder, 60 – 80 µm, to AAMA 2604 or Qualicoat Class 2 for strong sun and coastal sites. Anthracite, black, white and textured greys are the common colours.
Wood-grain
Sublimated wood-grain finishes on blades or posts give a timber look without maintenance.
Side screens
Zip-track roller screens for wind and insect protection, typically declared under EN 13561 with a wind resistance class.
Glass walls
Sliding or fixed glass panels turn the pergola into a semi-enclosed outdoor room.
Slat walls
Fixed or adjustable aluminium slats on one or more sides for privacy and wind shelter.
Lighting and heating
LED strips in the beams or blades, and infrared heaters mounted to the frame for evening use.
Aluminium compared with timber and steel pergolas
| Factor | Aluminium | Timber | Steel |
|---|---|---|---|
| Corrosion / decay | Does not rust or rot | Rots and weathers without treatment | Rusts where the coating is damaged |
| Maintenance | Wash occasionally | Stain or oil regularly | Touch-up painting |
| Weight | Light | Moderate, bulky sections | Heavy |
| Integrated drainage and wiring | Yes, in the extrusions | Added separately | Added separately |
| Louvered roof | Standard | Rare | Possible, heavier |
| Relative cost | Medium to high | Low to medium | Medium |
Where aluminium pergolas are used
- Residential gardens and patios: a freestanding 3 × 4 m louvered unit with manual crank, or a wall-mounted unit off the rear of the house.
- Rooftop terraces: wall- or parapet-mounted pergolas with ballast or engineered anchors where the roof membrane cannot be penetrated freely.
- Pool areas: shade over loungers, with a coastal-grade powder coat and stainless fixings around chlorinated water.
- Restaurants and cafés: joined modules over outdoor seating with motorised blades, rain sensors, side screens, lighting and heaters.
- Hotels and resorts: repeated units over terraces and beach areas, matched in colour to windows and railings.
- Commercial courtyards and offices: shaded outdoor working and meeting areas.
Common mistakes when specifying a pergola
- Choosing by size alone: two pergolas of the same footprint can have very different post, beam and blade sections. Compare wall thickness and published wind and snow ratings, not just dimensions.
- Ignoring the foundation: a strong frame on weak anchors is only as strong as the anchors. Pavers and thin decks rarely give adequate fixing without footings.
- Forgetting drainage outlets: water leaving the posts needs somewhere to go; plan a drain, soakaway or channel at each outlet post.
- Adding side screens later: screens and glass change wind loads and may need extra posts; decide early so the frame is sized for them.
- Leaving power to the end: motorised roofs, lights and heaters need cable routes planned before slabs and finishes are laid.
How to order aluminium pergola profiles
- Size and mountingWidth, depth, clear height, and whether the pergola is freestanding, wall-mounted or built as joined modules.
- Roof and driveFixed slats, rotating or retractable louvers, solid or glazed roof; manual or motorised operation.
- Site conditionsLocation, wind and snow exposure, and the foundation or deck the posts will fix to.
- Finish and optionsColour and coating standard; side screens, glass, lighting, heaters and sensors.
- Quote, pack and shipWe confirm the profile and accessory list and delivered price on EXW, FOB, CIF or DAP terms; profiles are labelled and packed with protective film for export.
References and standards
- ASTM B221 – Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
- EN 1999-1-1 (Eurocode 9) – Design of aluminium structures
- EN 1991-1-4 – Actions on structures: wind actions; EN 1991-1-3 – snow loads
- ASCE/SEI 7 – Minimum Design Loads and Associated Criteria for Buildings and Other Structures
- EN 13561 – External blinds and awnings: performance requirements including safety
- Qualicoat – Specifications for coatings on aluminium for architectural applications
Aluminium (aluminum) pergolas: FAQ
Is a louvered aluminium pergola waterproof?
When closed, the blades overlap and shed rain into gutters in the beams, which drain through the posts. That keeps the area under it dry in normal rain. It is not a sealed roof like a sunroom: very heavy, wind-driven rain can blow in at the sides unless side screens or glass are fitted.
How big can an aluminium pergola be?
A single roof module is typically limited to about 4 – 4.5 m blade length and 6 – 7 m beam length, depending on the system and site loads. Larger areas are covered by joining modules with shared posts and gutters.
Can an aluminium pergola withstand strong wind and snow?
Yes, if the system is engineered for the site. Ask for the published wind and snow ratings, anchor the posts to a proper foundation, and follow the operating advice, such as opening blades before heavy snow or retracting side screens in high winds.
Do aluminium pergolas need maintenance?
Very little. Wash the frame and blades a few times a year, keep gutters and post outlets clear of leaves, and check fixings and the drive annually. Near the sea, rinse more often to remove salt.
Should I choose a freestanding or wall-mounted pergola?
Freestanding units stand on four or more posts anywhere in the garden. Wall-mounted units fix one side to the building, which saves two posts and gives a seamless link to the house, but the wall must be strong enough and the junction properly flashed.
What alloy are pergola profiles made from?
Mainly 6063 in T5 or T6 temper, extruded to ASTM B221 or EN 755 and powder coated. Long-span beams may use thicker walls or 6005A-T6 for extra stiffness.
Planning a pergola project?
Send the size, mounting, roof type, colour and destination to sales@metline.in for a profile list and delivered price.
