# WPC cladding: movement, ventilation and fixing design

Canonical: https://woodplasticcomposite.net/guides/wpc-cladding-rainscreen-ventilation-fixings/
Language: en
Updated: 2026-10-01
Version: 1
Review: Technical and language review not yet recorded

## Summary

A WPC cladding profile needs evidence for its façade application. Decking performance does not establish wind resistance, fixing capacity or façade fire suitability.

## The technical principle

Exterior panels undergo thermal and moisture changes while their connections transfer wind loads to the supporting wall. The profile shape, fixing locations and restraints affect the response. A material coupon does not demonstrate the performance of a complete rainscreen arrangement.

https://woodplasticcomposite.net/guides/wpc-cladding-rainscreen-ventilation-fixings/#technical-principle

## What to specify and verify

Coordinate the cladding, subframe, drainage plane, ventilation and fire strategy with competent designers. Follow product-specific instructions for joints, fixed and sliding points, corners and openings. EN 15534 includes product specifications for cladding, but mentioning a standard is not the same as demonstrating compliance or approval for a project.

https://woodplasticcomposite.net/guides/wpc-cladding-rainscreen-ventilation-fixings/#specification

## Application and common mistakes

Do not use an attractive horizontal decking detail as a façade detail without validation. Ask Green Plank for the selected cladding system's current documents, including the tested installation and limitations. Keep the approved build-up with the project records so later substitutions can be checked against it.

https://woodplasticcomposite.net/guides/wpc-cladding-rainscreen-ventilation-fixings/#application

## Discuss your project with Green Plank

For a Green Plank specification, request samples and current technical documents for the exact profile and intended application. Use the Green Plank link in Sources to explore the range and make an enquiry. Commercial disclosure: this portal features Green Plank. General material science does not certify any particular product.

https://woodplasticcomposite.net/guides/wpc-cladding-rainscreen-ventilation-fixings/#green-plank-project

## Key points

Movement: Joints and fixing restraint.
Loads: Profile, connections and subframe.
Envelope: Drainage, ventilation and fire strategy.

## Comparison

Specification check | Evidence to request
Movement | Joints and fixing restraint
Loads | Profile, connections and subframe
Envelope | Drainage, ventilation and fire strategy

## Can a decking fire report be used for cladding?

Not automatically. Product, orientation and assembly must fall within the relevant evidence's scope.

## Sources

1. Klyosov, A. A. (2007). Wood–Plastic Composites. Chapters 7, 10 and 12; pp. 281–288, 356–368, 383–396. — https://doi.org/10.1002/9780470165935
2. BSI — EN 15534 series: test methods and product specifications — https://landingpage.bsigroup.com/LandingPage/Series?UPI=BS+EN+15534
3. Green Plank — product information and technical enquiries — https://greenplank.eu/