Coxwell
ContactGet a quote
Home/Applications/Polycarbonate Covered Walkways & Underpasses

Polycarbonate Covered Walkways & Underpasses

Natural daylight replaces artificial lighting. Mechanical joint survives vibration and monsoon indefinitely.

Polycarbonate vault canopy covered walkway — Coxwell Multicell opal
FIG. 01 · InstalledPolycarbonate Covered Walkways & Underpasses
01 · Overview

Public infrastructure should be daylit. A covered walkway or underpass that relies on artificial lighting during the day is both an energy cost and a quality-of-life failure. Polycarbonate vault canopies solve both problems — replacing artificial lighting with diffuse, even natural illumination while providing weather protection with minimal sealant maintenance.

Coxwell has delivered covered walkway and underpass infrastructure across Delhi, Mumbai, Uttar Pradesh, Maharashtra, Chhattisgarh, and more — for CPWD, PWD, Indian Railways, NCRTC, and Delhi Metro.

02 · Why polycarbonate

Polycarbonate vs alternatives.

FeaturePolycarbonateGlassMetal roofing
Daylighting✓ Diffuse, eliminates artificial lighting✓ With glare and heat✗ None
Weight1.5–4.5 kg/m²10–25 kg/m²4–8 kg/m²
Vibration toleranceHigh — flexibleLow — sealant failsModerate
MaintenanceNone — no sealant jointsSeal maintenanceAnnual painting
Curved profilesYes — vault, eye-shapeSpecialist onlyLimited
Gov. specificationCPWD, PWD, Railway, Metro approvedSpecialistStandard
03 · Products

Recommended for this application.

Primary

Multicell

Vault and eye-shape profiles are Coxwell's most common walkway specification. The double-tooth interlocking mechanical joint handles vibration loading from pedestrian traffic, road traffic, and rail vibration without sealant failure. Specified on Delhi Metro, NCRTC Meerut, and multiple PWD underpass projects.

Specify Multicell →
04 · Specification

How to specify.

Specifying polycarbonate for walkways and underpasses

VaultStandard covered walkway. 3–15 m span.
Eye-shapeArchitectural transit canopies. Metro interchanges.
Single-side slopePlatform canopies, transit station side covers.
FlatShort-span connectors between buildings.
12 mmLight pedestrian walkways, campus connections
14–16 mmStandard public walkways, CPWD/PWD specification
18–20 mmHigh-traffic urban underpasses, metro infrastructure
22–25 mmHeavy road underpasses, railway infrastructure
OpalDiffuse light quality. Most common public specification.
IceCool, neutral daylight. Underpasses and transit corridors.
ClearMaximum light transmission. Campus and institutional walkways.
05 · Reference projects

In the field.

Sarai Kale Khan Metro Interchange, Delhi

5,239 m² · Multicell 14mm Clear · Vault and eye-shape · 2025. Covering Delhi's busiest transit interchange. No supplementary daytime lighting required.

View project →
Ashram Chowk Underpass, Delhi

6,755 m² · Multicell 16mm Opal · Vault · 2023. PWD Delhi. High-traffic urban underpass — mechanical joint handles road vibration.

View project →
Pragati Maidan Underpass, Delhi

3,000 m² · Multicell 16mm Ice · Vault · 2023. PWD Delhi. Central Delhi urban infrastructure.

View project →
06 · FAQ

Common questions.

Can polycarbonate handle the vibration load from road traffic in underpasses?+

Yes. Coxwell Multicell's double-tooth interlocking joint is a mechanical connection — not sealant-dependent. It maintains its watertight performance under cyclic vibration loading from road and rail traffic indefinitely. This is precisely why it is the system of choice for Delhi's underpass and metro infrastructure — where sealant-based systems would fail within 5–7 years.

What government bodies in India specify Coxwell polycarbonate for walkways?+

Coxwell has delivered walkway and underpass infrastructure for CPWD, PWD Delhi, Indian Railways (multiple zones), NCRTC (Meerut metro), and Delhi Metro. IS 14434 references and product documentation are available to support government project specifications.

What is the maximum vault span for a Coxwell polycarbonate walkway?+

Multicell vault profiles can span up to 12 m between lateral supports. For wider spans, intermediate structural arches are specified with panels spanning between them. The Ashram Chowk Underpass (6,755 m²) uses continuous vault profiles across a multi-lane road width.

How does polycarbonate perform in monsoon conditions for walkways?+

Polycarbonate vault profiles are designed for active drainage under rainfall — the curved profile sheds water at any pitch above 5°. The double-tooth mechanical joint has been proven watertight in Indian monsoon conditions across 3,200+ Coxwell roofing and walkway installations.

Is artificial lighting still required under a polycarbonate walkway canopy?+

In most cases, no — not during daylight hours. Opal White tint delivers 50% diffuse light transmission, which is typically sufficient for a covered walkway between 6am and 6pm. Artificial lighting is required for evening and night use, and may be required in very deep underpasses or low-pitch covered corridors where the light path is restricted.

07 · Specify

Specify a Coxwell walkway canopy →

Share your walkway dimensions, structure type, and specification requirements. Engineering response within 48 hours.

Get a walkway quote →
Have a project to spec?Engineering response within 48h
Get a quote →